When `O_(2)` is adsorbed on a metallic surface, electron transfer electron transfer occurs from the metal to `O_(2).` The TRUE statement (s) regarding

When `O_(2)` is adsorbed on a metallic surface, electron transfer electron transfer occurs from the metal to `O_(2).` The TRUE statement (s) regarding
by

1 Answer

Answer :

When `O_(2)` is adsorbed on a metallic surface, electron transfer electron transfer occurs from the metal ... D. bong length of `O_(2)` is increased
by

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Reaction (A) `S^(-2)+4H_(2)O_(2)rarrSO_(4)^(2-)+4H_(2)O` (B) `Cl_(2)+H_(2)O_(2)rarr2HCl+O_(2)` The true statement regarding the above reactions is :

Description : Reaction (A) `S^(-2)+4H_(2)O_(2)rarrSO_(4)^(2-)+4H_(2)O` (B) `Cl_(2)+H_(2)O_(2)rarr2HCl+O_(2)` The true statement regarding the above reactions is :

Last Answer : Reaction (A) `S^(-2)+4H_(2)O_(2)rarrSO_(4)^(2-)+4H_(2)O` (B) `Cl_(2)+H_(2)O_(2) ... 2)` acts as reductant in reaction (A) and oxidant in reactin (B)

Assertion(A): Physical adsorption of molecules on the surface requires activation energy. Reason(R): Because the bonds of adsorbed molecules are broke

Description : Assertion(A): Physical adsorption of molecules on the surface requires activation energy. Reason(R): Because the bonds of adsorbed molecules are broke

Last Answer : Assertion(A): Physical adsorption of molecules on the surface requires activation energy. Reason(R): ... D. If both Assertion & Reason are False.

The mass of argon adsorbed per unit mass of carbon surface is plotted against pressure. Which of the following plots is correct if x and m represent t

Description : The mass of argon adsorbed per unit mass of carbon surface is plotted against pressure. Which of the following plots is correct if x and m represent t

Last Answer : The mass of argon adsorbed per unit mass of carbon surface is plotted against pressure. Which of the ... Represents extrapolated data) A. B. C. D.

Which will be adsorbed more readily on the surface of charcoal and why NH3 or CO2?

Description : Which will be adsorbed more readily on the surface of charcoal and why NH3 or CO2?

Last Answer : Ans: The critical temperature NH3 is more CO2, therefore NH3 is liquefied more easily than CO2. Hence NH3 has higher intermolecular forces of attraction and hence it adsorbed more readily. 

In Langmuir treatment of adsorption, (A) Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule (B) Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site (C) All the adsorption does not take place by the same mechanism (D) Extent of adsorption is more than one complete monomolecular layer on the surface

Description : In Langmuir treatment of adsorption, (A) Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule (B) Whole surface of ... same mechanism (D) Extent of adsorption is more than one complete monomolecular layer on the surface

Last Answer : (B) Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation? (A) Langmuir's assumption applies to every adsorbed layer (B) There is no dynamic equilibrium between successive layer (C) The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process (D) None of these

Description : Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates ... (except the first one) is involved in each of the evaporation process (D) None of these

Last Answer : (B) There is no dynamic equilibrium between successive layer

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively. (A) 2 (B) 8 (C) 10 (D) 40

Description : What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively. (A) 2 (B) 8 (C) 10 (D) 40

Last Answer : (A) 2

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at `25^(@) C`. For this process, the correct statement is

Description : Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at `25^(@) C`. For this process, the correct statement is

Last Answer : Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at `25^(@) C` ... of temperature. D. The adsorption is irreversible.

Pick out the wrong statement: (A) Change in barometric pressure does not affect the relative humidity (B) In case of a packed tower, the operating velocity is about half of the flooding velocity, generally (C) 'Elution' means the desorption of the adsorbed solute by a solvent (D) The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

Description : Pick out the wrong statement: (A) Change in barometric pressure does not affect the relative humidity (B) In case of a packed tower, the operating velocity is about half of the ... (D) The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

Last Answer : (D) The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

Pick out the wrong statement. Generally for physical adsorption, a gas of (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight (B) High critical temperature is adsorbed in preference to a gas of low critical temperature (C) Low volatility is adsorbed in preference to a gas of high volatility (D) None of these

Description : Pick out the wrong statement. Generally for physical adsorption, a gas of (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight (B) High critical temperature ... volatility is adsorbed in preference to a gas of high volatility (D) None of these

Last Answer : (D) None of these

Which of the following statements regarding mitochondrial membrane is not correct ? (a) The outer membrane resembles a sieve. (b) The outer membrane is permeable to all kinds of molecules. (c) The enzymes of the electron transfer chain are embedded in the outer membrane. (d) The inner membrane is highly convoluted forming a series of infoldings.

Description : Which of the following statements regarding mitochondrial membrane is not correct ? (a) The outer membrane resembles a sieve. (b) The outer membrane is permeable to all kinds of molecules. (c) ... in the outer membrane. (d) The inner membrane is highly convoluted forming a series of infoldings.

Last Answer : (c) The enzymes of the electron transfer chain are embedded in the outer membrane.

Pick out the wrong statement. (A) Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom (B) The heat capacity of solid inorganic substance is exactly equal to the heatcapacity of the substance in the molten state(C) There is an increase in entropy, when a spontaneous change occurs in anisolated system(D) At absolute zero temperature, the heat capacity for many pure crystallinesubstances is zero

Description : Pick out the wrong statement. (A) Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom (B) The heat capacity of solid inorganic substance is exactly equal to the ... isolated system (D) At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

Last Answer : (C) There is an increase in entropy, when a spontaneous change occurs in an isolated system

How many of the following properties of halogen Increases with increase In atomic number. (a) Number of valence electron (b) Metallic nature (c) Boili

Description : How many of the following properties of halogen Increases with increase In atomic number. (a) Number of valence electron (b) Metallic nature (c) Boili

Last Answer : How many of the following properties of halogen Increases with increase In atomic number. (a) Number of ... . (j) `Delta_"eg"H` (magnitude wise)

Ohm’s law obeyed in - (1) a metallic conductor (2) a semi conductor (3) an electron tube (4) in all of the above

Description : Ohm’s law obeyed in - (1) a metallic conductor (2) a semi conductor (3) an electron tube (4) in all of the above

Last Answer : (1) a metallic conductor Explanation: There are, however, components of electrical circuits which do not obey Ohm's law; that is, their relationship between current and voltage (their I–V curve) is nonlinear (or non-ohmic).

Metalloids (A) Are good conductor of heat & electricity (B) Act as electron donors with metals & as electron acceptor with non metals (C) Are not necessarily solids at room temperature (D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Description : Metalloids (A) Are good conductor of heat & electricity (B) Act as electron donors with metals & as electron acceptor with non metals (C) Are not necessarily solids at room temperature ... & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)

Description : The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)

Last Answer : The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic ... the oxidation state of the metal is increased

An adsorption isotherm equation proposed by Langmuir is of the form `V = (V_(0)bPO)/((1 + bP))` where V is the volume of gas adsorbed at pressure P. F

Description : An adsorption isotherm equation proposed by Langmuir is of the form `V = (V_(0)bPO)/((1 + bP))` where V is the volume of gas adsorbed at pressure P. F

Last Answer : An adsorption isotherm equation proposed by Langmuir is of the form `V = (V_(0)bPO)/((1 + bP))` where V is ... of V on P can be depicted as B. C. D.

Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressur

Description : Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressur

Last Answer : Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m ... p^(1//2)` D. `p^(1//4)`

At equilibrium the concentration of water in vapour phase (C* ) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is (A) 0.0 (B) 0.2 (C) 0.4 (D) 1.0

Description : At equilibrium the concentration of water in vapour phase (C* ) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room ... which the temperature is maintained constant) is (A) 0.0 (B) 0.2 (C) 0.4 (D) 1.0

Last Answer : (C) 0.4

The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its (A) Integral heat of adsorption (B) Heat of wetting (C) Differential heat of adsorption (D) Heat of normal condensation

Description : The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its (A) Integral heat of adsorption (B) Heat of wetting (C) Differential heat of adsorption (D) Heat of normal condensation

Last Answer : (A) Integral heat of adsorption

At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent (A) Increases (B) Decreases (C) Remains unchanged (D) Increases exponentially

Description : At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent (A) Increases (B) Decreases (C) Remains unchanged (D) Increases exponentially

Last Answer : (B) Decreases

Out of CO and NH3 which is adsorbed on activated charcoal to a large extent and why ?

Description : Out of CO and NH3 which is adsorbed on activated charcoal to a large extent and why ?

Last Answer : Ans. Ammonia; because more easily liquefiable gas undergoes adsorption to a greater extent.

The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the (A) Differential heat of adsorption (B) Heat of wetting (C) Integral heat of adsorption (D) None of these

Description : The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the (A) ... (B) Heat of wetting (C) Integral heat of adsorption (D) None of these

Last Answer : (A) Differential heat of adsorption

Which of the following assumptions of Freunlich adsorption isotherm is incorrect? (a) The constants are temperature dependent (b) It is valid over a range of pressure only (c) Adsorption isotherm equation is purely an empirical equation (d) The adsorbed molecules may be multimolecular in thickness

Description : Which of the following assumptions of Freunlich adsorption isotherm is incorrect? (a) The constants are temperature dependent (b) It is valid over a range of pressure only (c) Adsorption ... equation is purely an empirical equation (d) The adsorbed molecules may be multimolecular in thickness

Last Answer : (d) The adsorbed molecules may be multimolecular in thickness

Pick out the wrong statement. (A) The emissivity of a surface decreases, if it gets corroded by atmospheric environment (B) The emissivity of a surface increases with increase in surface roughness (C) The emissivity of a polished surface is quite low (D) The emissivity of a non-metallic surface decreases with increase in the temperature

Description : Pick out the wrong statement. (A) The emissivity of a surface decreases, if it gets corroded by atmospheric environment (B) The emissivity of a surface increases with increase in surface roughness ... quite low (D) The emissivity of a non-metallic surface decreases with increase in the temperature

Last Answer : (A) The emissivity of a surface decreases, if it gets corroded by atmospheric environment

The minimum energy required to eject an electron from a metal surface is called a) Intensity b) Threshold frequency c) Work function d) Photo energy

Description : The minimum energy required to eject an electron from a metal surface is called a) Intensity b) Threshold frequency c) Work function d) Photo energy

Last Answer : c) Work function

At inner membrane of mitochondria, passing on the electron removed as part of the hydrogen atoms to molecular `O_(2)` with simultaneous synthesis of A

Description : At inner membrane of mitochondria, passing on the electron removed as part of the hydrogen atoms to molecular `O_(2)` with simultaneous synthesis of A

Last Answer : At inner membrane of mitochondria, passing on the electron removed as part of the hydrogen atoms ... (2)` with simultaneous synthesis of ATP occurs.

At inner membrane of mitochondria, passing on the electron removed as part of the hydrogen atoms to molecular `O_(2)` with simultaneous synthesis of A

Description : At inner membrane of mitochondria, passing on the electron removed as part of the hydrogen atoms to molecular `O_(2)` with simultaneous synthesis of A

Last Answer : At inner membrane of mitochondria, passing on the electron removed as part of the hydrogen atoms ... (2)` with simultaneous synthesis of ATP occurs.

From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Description : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Last Answer : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements: A. It can act only ... dark D. It has to be kept away from dust

From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Description : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements:

Last Answer : From the following statements regarding `H_(2)O_(2)`, choose the incorrect statements: A. It can act only ... dark D. It has to be kept away from dust

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by (A) Diffusion within the pellet (B) Reaction (C) External mass transfer (D) None of the above

Description : A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the ... A) Diffusion within the pellet (B) Reaction (C) External mass transfer (D) None of the above

Last Answer : (A) Diffusion within the pellet

Statement-I : In the extraction of Ag, the complex `Na[Ag(CN)_(2)]` is reacted with `Zn` Statement-II : `Zn` is transition metal according to electron

Description : Statement-I : In the extraction of Ag, the complex `Na[Ag(CN)_(2)]` is reacted with `Zn` Statement-II : `Zn` is transition metal according to electron

Last Answer : Statement-I : In the extraction of Ag, the complex `Na[Ag(CN)_(2)]` is reacted with `Zn` ... . Statement-1 : is false , statement-2 : is true

Pick out the wrong statement. (A) Lead can creep under its own weight at room temperature (B) The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement (C) Recrystallisation temperature decreases with decrease in strain in a cold worked metal (D) With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase

Description : Pick out the wrong statement. (A) Lead can creep under its own weight at room temperature (B) The electrical conductivity of gold is considerably reduced by alloying additions due to ... metal (D) With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase

Last Answer : (C) Recrystallisation temperature decreases with decrease in strain in a cold worked metal

Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles (C) S.I. unit of fouling factor is Watt/m2 .°K (D) Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Description : Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger ... surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Last Answer : (C) S.I. unit of fouling factor is Watt/m2 .°K

Why can't we put metal in microwaves, but many microwaves have metallic walls/roof?

Description : Why can't we put metal in microwaves, but many microwaves have metallic walls/roof?

Last Answer : When you put metal objects in the microwave, they function as an antenna, conducting electricity. Since most microwaves are putting out around 800-1500w, that's a lot of electricity to put into a piece of ... in it, is also a shield, with the little holes letting light, but not microwaves, out.

A shot-put is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g/cm3. -Maths 9th

Description : A shot-put is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g/cm3. -Maths 9th

Last Answer : We have, the radius of a metallic sphere (r) = 4.9 cm ∴ Volume of the sphere = 4 / 3 πr3 = 4 / 3 × 22 / 7 × 4.9 × 4.9 × 4.9 = 493.005 cm3 ∵ Density of the metal used = 7.8 g/cm3 Hence, the mass of the shot - put = 493.005 × 7.8 = 3845.44

A shot-put is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g/cm3. -Maths 9th

Description : A shot-put is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g/cm3. -Maths 9th

Last Answer : We have, the radius of a metallic sphere (r) = 4.9 cm ∴ Volume of the sphere = 4 / 3 πr3 = 4 / 3 × 22 / 7 × 4.9 × 4.9 × 4.9 = 493.005 cm3 ∵ Density of the metal used = 7.8 g/cm3 Hence, the mass of the shot - put = 493.005 × 7.8 = 3845.44

Which metal is more metallic in nature among 1A group elements ?

Description : Which metal is more metallic in nature among 1A group elements ?

Last Answer : Francium

A steel ball floats on mercury because (a) mercury does not allow any metallic ball to sink in it (b) mercury is also a metal in the liquid form (c) the density of mercury is higher than that of steel (d) a steel ball can be made to float on any liquid by suitable adjustment

Description : A steel ball floats on mercury because (a) mercury does not allow any metallic ball to sink in it (b) mercury is also a metal in the liquid form (c) the density of mercury is higher than that of steel (d) a steel ball can be made to float on any liquid by suitable adjustment

Last Answer : Ans:(c)

Non - metal shows metallic character?

Description : Non - metal shows metallic character?

Last Answer : Hydrogen

A metallic alloy in which one of the constituent metal is __________, is called an amalgam. (A) Zinc (B) Mercury (C) Lead (D) Tin

Description : A metallic alloy in which one of the constituent metal is __________, is called an amalgam. (A) Zinc (B) Mercury (C) Lead (D) Tin

Last Answer : (B) Mercury

A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity

Description : A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity

Last Answer : (A) More corrosion resistant

Name non-metal of Boron Family .What is the reason for its non-metallic behavior?

Description : Name non-metal of Boron Family .What is the reason for its non-metallic behavior?

Last Answer : Ans Boron. Because of its small size ,high ionization enthalpy and comparatively high electronegativity.

The first element of 14 th group is carbon, which is a non-metal. The metallic members of this group are

Description : The first element of 14 th group is carbon, which is a non-metal. The metallic members of this group are

Last Answer : tin and lead

An alkali metal salt of Palmitic acid is known as (A) Soap (B) Metallic soap (C) Detergent (D) Alkaloid

Description : An alkali metal salt of Palmitic acid is known as (A) Soap (B) Metallic soap (C) Detergent (D) Alkaloid

Last Answer : (B) Metallic soap

Metallic surveying tapes are made of __________ which has a low co efficient of expansion & enough strength. (A) Invar (B) Hastelloy (C) Duralumin (D) Monel metal

Description : Metallic surveying tapes are made of __________ which has a low co efficient of expansion & enough strength. (A) Invar (B) Hastelloy (C) Duralumin (D) Monel metal

Last Answer : (A) Invar

When should metallic framework not be contaminated during the fabrication of a porcelain fused to metal crown: A. Between bisque stage and glazing stage B. Between preheat and opaque stages C. Between opaque and bisque stages D. Between one opaque and two opaque stages

Description : When should metallic framework not be contaminated during the fabrication of a porcelain fused to metal crown: A. Between bisque stage and glazing stage B. Between preheat and opaque stages C. Between opaque and bisque stages D. Between one opaque and two opaque stages

Last Answer : B. Between preheat and opaque stages

74.5 g of a metallic chloride contains 35.5 g of chlorine. The equivalent weight of the metal is [CPMT 1986] (A) 19.5 (B) 35.5 (C) 39.0 (D) 78.0

Description : 74.5 g of a metallic chloride contains 35.5 g of chlorine. The equivalent weight of the metal is [CPMT 1986] (A) 19.5 (B) 35.5 (C) 39.0 (D) 78.0

Last Answer : (C) 39.0

Which of the following statements regarding T.C.A cycle is true? (A) It is an anaerobic process (B) It occurs in cytosol (C) It contains no intermediates for Gluconeogenesis (D) It is amphibolic in nature

Description : Which of the following statements regarding T.C.A cycle is true? (A) It is an anaerobic process (B) It occurs in cytosol (C) It contains no intermediates for Gluconeogenesis (D) It is amphibolic in nature

Last Answer : D