Conversion of a substance directly from solid to vapour state is known as (a) Vaporisation (b) Sublimation (c) Decomposition (d) Ionisation

Conversion of a substance directly from solid to vapour state is known as (a) Vaporisation (b) Sublimation (c) Decomposition (d) Ionisation
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Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of (A) Sublimation (B) Fusion (C) Transition (D) Vaporisation

Description : Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of (A) Sublimation (B) Fusion (C) Transition (D) Vaporisation

Last Answer : C) Transition

The process of conversion of substance directly from solid to vapour state?

Description : The process of conversion of substance directly from solid to vapour state?

Last Answer : Sublimation

Sodium vapour lamps glow with yellow colour. This is due to - (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Description : Sodium vapour lamps glow with yellow colour. This is due to - (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the ... (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Last Answer : (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum Explanation: Sodium Vapour Lamps glow with yellow colour due to the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum.

Sodium vapour lamps glow with yellow colour. This is due to (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Description : Sodium vapour lamps glow with yellow colour. This is due to (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the ... (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Last Answer : the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum

What is defined as the direct conversion of a substance from the solid to the vapor state or vice versa without passing the liquid state?  A. Condensation  B. Vaporization  C. Sublimation  D. Cryogenation

Description : What is defined as the direct conversion of a substance from the solid to the vapor state or vice versa without passing the liquid state?  A. Condensation  B. Vaporization  C. Sublimation  D. Cryogenation

Last Answer : Sublimation

Specific/molar Gibbs free energy for a pure substance does not change during (A) Sublimation (B) Vaporisation (C) Melting (D) Either (A), (B) or (C)

Description : Specific/molar Gibbs free energy for a pure substance does not change during (A) Sublimation (B) Vaporisation (C) Melting (D) Either (A), (B) or (C)

Last Answer : (D) Either (A), (B) or (C)

When vaporisation takes place directly at the heating surface, it is called (A) Film boiling (B) Nucleate boiling (C) Vapour binding (D) None of these

Description : When vaporisation takes place directly at the heating surface, it is called (A) Film boiling (B) Nucleate boiling (C) Vapour binding (D) None of these

Last Answer : (B) Nucleate boiling

Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of (A) Fusion (B) Vaporisation (C) Transition (D) None of these

Description : Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of (A) Fusion (B) Vaporisation (C) Transition (D) None of these

Last Answer : (C) Transition

The changing of solid directly to vapor without passing through liquid state is called  a. Evaporation  b. Vaporization  c. Sublimation  d. Condensation

Description : The changing of solid directly to vapor without passing through liquid state is called  a. Evaporation  b. Vaporization  c. Sublimation  d. Condensation

Last Answer : Sublimation

When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of – (1) evaporation (2) vaporisation (3) diffusion (4) sublimation

Description : When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of – (1) evaporation (2) vaporisation (3) diffusion (4) sublimation

Last Answer : (3) diffusion Explanation: Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring ... are other transport mechanisms that use bulk motion to move particles from One place to another.

Pick out the wrong statement. (A) Minimum number of degree of freedom of a system is zero (B) Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4 (C) For a two phase system in equilibrium made up of fourchemical species, the number of degrees of freedom is 4 (D) Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

Description : Pick out the wrong statement. (A) Minimum number of degree of freedom of a system is zero (B) Degree of freedom of a system containing a gaseous mixture of helium, carbon ... ) Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

Last Answer : (D) Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of (A) Solution (B) Vaporisation (C) Formation (D) Sublimation

Description : Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of (A) Solution (B) Vaporisation (C) Formation (D) Sublimation

Last Answer : (B) Vaporisation

Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.). (A) Entropy (B) Internal energy (C) Enthalpy (D) Gibbs free energy

Description : Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.). (A) Entropy (B) Internal energy (C) Enthalpy (D) Gibbs free energy

Last Answer : (D) Gibbs free energy

_________ does not change during phase transformation processes like sublimation, melting & vaporisation. (A) Entropy (B) Gibbs free energy (C) Internal energy (D) All (A), (B) & (C)

Description : _________ does not change during phase transformation processes like sublimation, melting & vaporisation. (A) Entropy (B) Gibbs free energy (C) Internal energy (D) All (A), (B) & (C)

Last Answer : (B) Gibbs free energy

When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of : (1) evaporation (2) vaporisation (3) diffusion (4) sublimation

Description : When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of : (1) evaporation (2) vaporisation (3) diffusion (4) sublimation

Last Answer : diffusion

The process of a solid converting directly into a gas is called: w) fusion x) sublimation y) condensation z) distillation

Description : The process of a solid converting directly into a gas is called: w) fusion x) sublimation y) condensation z) distillation

Last Answer : ANSWER: X -- SUBLIMATION 

_________ is the transition of a given substance from the solid to the gas phase with no intermediate liquid stage.  a. Convection  b. Conduction  c. Radiation  d. Sublimation

Description : _________ is the transition of a given substance from the solid to the gas phase with no intermediate liquid stage.  a. Convection  b. Conduction  c. Radiation  d. Sublimation

Last Answer : Sublimation

Clausius-Clapeyron Equation gives accurate result, when the (A) Vapour pressure is relatively low and the temperature does not vary over wide limits (B) Vapour obeys the ideal gas law and the latent heat of vaporisation is constant (C) Volume in the liquid state is negligible compared with that in the vapour state (D) All (A), (B) and (C)

Description : Clausius-Clapeyron Equation gives accurate result, when the (A) Vapour pressure is relatively low and the temperature does not vary over wide limits (B) Vapour obeys the ideal gas law and the latent heat of ... is negligible compared with that in the vapour state (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Which of the following statement(s) is (are) true for the given situation? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride (a) (i) only (b) (ii), (i) and (iii) (c) (ii) and (iii) (d) (iv) only

Description : Which of the following statement(s) is (are) true for the given situation? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) formation of silver by decomposition of silver chloride (ii) sublimation of ... (b) (ii), (i) and (iii) (c) (ii) and (iii) (d) (iv) only

Last Answer : (a) (i) only

Which of the following is a physical change? (1) oxidation (2) reduction (3) sublimation (4) decomposition

Description : Which of the following is a physical change? (1) oxidation (2) reduction (3) sublimation (4) decomposition

Last Answer : (3) sublimation Explanation: Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.

To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (∆HV/R) (1/T1- 1/T2) from the exact Clapeyron equation, it is assumed that the (A) Volume of the liquid phase is negligible compared to that of vapour phase (B) Vapour phase behaves as an ideal gas (C) Heat of vaporisation is independent of temperature (D) All (A), (B) & (C)

Description : To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (∆HV/R) (1/T1- 1/T2) from the exact Clapeyron equation, it is assumed that the (A) Volume of the liquid phase is negligible compared to ... gas (C) Heat of vaporisation is independent of temperature (D) All (A), (B) & (C)

Last Answer : (D) All (A), (B) & (C)

Condensation process refers to : (1) Conversion of water into water vapour (2) Conversion of water vapour into solid form (3) Conversion of water into solid form (4) Conversion of water vapour into its liquid form

Description : Condensation process refers to : (1) Conversion of water into water vapour (2) Conversion of water vapour into solid form (3) Conversion of water into solid form (4) Conversion of water vapour into its liquid form

Last Answer : (4) Conversion of water vapour into its liquid form Explanation: Condensation is the change of the physical state of matter from gas phase into liquid phase. It is also defined as teh change in the state of water vapour to liquid water when in contact with a liquid or solid surface.

Clapeyron equation is applicable for registration at (a) saturation point of vapour (b) saturation point of liquid (c) sublimation temperature (d) triple point.

Description : Clapeyron equation is applicable for registration at (a) saturation point of vapour (b) saturation point of liquid (c) sublimation temperature (d) triple point.

Last Answer : Ans: a

Any substance above its critical temperature exists as (A) Saturated vapour (B) Solid (C) Gas (D) Liquid

Description : Any substance above its critical temperature exists as (A) Saturated vapour (B) Solid (C) Gas (D) Liquid

Last Answer : (C) Gas

Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity. (A) Molal (B) Relative (C) Percentage (D) None of these

Description : Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in ... (A) Molal (B) Relative (C) Percentage (D) None of these

Last Answer : (A) Mola

The change in Gibbs free energy for vaporisation of a pure substance is (A) Positive (B) Negative (C) Zero (D) May be positive or negative

Description : The change in Gibbs free energy for vaporisation of a pure substance is (A) Positive (B) Negative (C) Zero (D) May be positive or negative

Last Answer : (C) Zero

Gibbs free energy per mole for a pure substance is equal to the (A) Latent heat of vaporisation (B) Chemical potential (C) Molal boiling point (D) Heat capacity

Description : Gibbs free energy per mole for a pure substance is equal to the (A) Latent heat of vaporisation (B) Chemical potential (C) Molal boiling point (D) Heat capacity

Last Answer : (B) Chemical potential

Sublimation temperature of dry ice (solid CO2) is __________ °C. (A) -273 (B) 0 (C) -78 (D) 5

Description : Sublimation temperature of dry ice (solid CO2) is __________ °C. (A) -273 (B) 0 (C) -78 (D) 5

Last Answer : (C) -78

____ is when water goes from a solid to a gas without passing through the liquid phase. a. Transfusion c. Evaporation b. Sublimation d. Condensation

Description : ____ is when water goes from a solid to a gas without passing through the liquid phase. a. Transfusion c. Evaporation b. Sublimation d. Condensation

Last Answer : b. Sublimation

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds (c) Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Last Answer : (d) Anaerobic ammonium oxidation and denitrification

Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. (A) 18 (B) 24 (C) 6 (D) 12

Description : Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. (A) 18 (B) 24 (C) 6 (D) 12

Last Answer : (B) 24

Pick out the wrong statement. (A) Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98% (B) The chemical formula of oleum is H2S2O7 , which is formed by saturating sulphuric acid with sulphur trioxide (C) Vitriol oil is nothing but technical sulphuric acid (D) Decomposition of sulphuric acid on heating does not start before its boiling

Description : Pick out the wrong statement. (A) Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98% (B) The chemical formula of oleum is H2S2O7 , which is formed by saturating ... but technical sulphuric acid (D) Decomposition of sulphuric acid on heating does not start before its boiling

Last Answer : (D) Decomposition of sulphuric acid on heating does not start before its boiling

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the (A) Maxwell's equation (B) Clausius-Clapeyron Equation (C) Van Laar equation (D) Nernst Heat Theorem

Description : If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the (A) Maxwell's equation (B) Clausius-Clapeyron Equation (C) Van Laar equation (D) Nernst Heat Theorem

Last Answer : B) Clausius-Clapeyron Equation

Reaction of substance X with water is (a) Decomposition reaction (b) Combination reaction (c) Displacement reaction (d) Double displacement reaction

Description : Reaction of substance X with water is (a) Decomposition reaction (b) Combination reaction (c) Displacement reaction (d) Double displacement reaction

Last Answer : (b) Combination reaction

Which one of the following processes during decomposition is correctly described? (a) Catabolism – Last step in the decomposition under fully anaerobic condition (b) Leaching – Water soluble inorganic nutrients rise to the top layers of soil (c) Fragmentation – Carried out by organisms such as earthworm (d) Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate.

Description : Which one of the following processes during decomposition is correctly described? (a) Catabolism - Last step in the decomposition under fully anaerobic condition (b) Leaching - Water soluble inorganic ... of a dark coloured substance humus which undergoes microbial action at a very fast rate.

Last Answer : (c) Fragmentation – Carried out by organisms such as earthworm

A green coloured solid compound ̳X‘, gets oxidized to reddish brown solid in presence of air. ̳X‘ on heating gives brown coloured solid ̳Y‘ and two pungent smelling gases ̳A‘ and ̳B‘. ̳A‘ turns acidified potassium dichromate solution green. Name ̳X‘, ̳Y‘, ̳A‘ , ̳B‘ and type of Reaction. (a) CuSO 4 , CuO, SO 2 , SO 3 , decomposition (b) FeSO 4 , Fe, SO 2 , SO 3 , decomposition (c) FeSO 4 , Fe 2 O 3, SO 2 , SO 3 , decomposition (d) FeSO 4 , Fe 2 O 3 , SO 3 , SO 2 , decomposition

Description : A green coloured solid compound ̳X , gets oxidized to reddish brown solid in presence of air. ̳X on heating gives brown coloured solid ̳Y and two pungent smelling gases ̳A and ̳B . ̳A turns acidified potassium ... , SO 3 , decomposition (d) FeSO 4 , Fe 2 O 3 , SO 3 , SO 2 , decomposition

Last Answer : (c) FeSO 4 , Fe 2 O 3, SO 2 , SO 3 , decomposition

From the following, which method is also called as the Building Block Approach? a.Cellular Decomposition b.Spatial Occupancy Enumeration c.Generalized Sweeps d.Constructive Solid Geometry

Description : From the following, which method is also called as the Building Block Approach? a.Cellular Decomposition b.Spatial Occupancy Enumeration c.Generalized Sweeps d.Constructive Solid Geometry

Last Answer : d.Constructive Solid Geometry

Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy. (2) The process occurs at a temperature above 430°C at atmospheric pressure. (3) The process occurs under high pressure at temperature above 430° C. (4) It is a thermo chemical decomposition of organic waste

Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid ... pressure at temperature above 430° C. (4) It is a thermo chemical decomposition of organic waste

Last Answer : (2) The process occurs at a temperature above 430°C at atmospheric pressure. Explanation: Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the ... . Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.

Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy. (2) The process occurs at a temperature above 430°C at atmospheric pressure. (3) The process occurs under high pressure at temperature above 430° C. (4) It is a thermochemical decomposition of organic waste

Description : Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect? (1) It converts the waste into solid, liquid and gas of which the resultant ... high pressure at temperature above 430° C. (4) It is a thermochemical decomposition of organic waste

Last Answer : The process occurs at a temperature above 430°C at atmospheric pressure.

For a solution of volatile liquids, the partial vapour pressure of each component in solution is directly proportional to its (a) Molarity (b) Mole fraction (c) Molality (d) Normality

Description : For a solution of volatile liquids, the partial vapour pressure of each component in solution is directly proportional to its (a) Molarity (b) Mole fraction (c) Molality (d) Normality

Last Answer : Ans:(b)

The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is?

Description : The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is?

Last Answer : 5x/36

The ionisation potential of hydrogen atom is `13.6` volt. The energy required to remove an electron in the `n = 2` state of the hydrogen atom is

Description : The ionisation potential of hydrogen atom is `13.6` volt. The energy required to remove an electron in the `n = 2` state of the hydrogen atom is

Last Answer : The ionisation potential of hydrogen atom is `13.6` volt. The energy required to remove an electron in the `n = 2` ... . 13.6 eV C. 6.8 eV D. 3.4 eV

Evaporation from ice and snow is known as------? A. evaporation B. sublimation (Answer) C. hydrogenation D. insolation

Description : Evaporation from ice and snow is known as------? A. evaporation B. sublimation (Answer) C. hydrogenation D. insolation

Last Answer : B. sublimation (Answer)

What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon

Description : What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon

Last Answer : (3) Mercury vapour and argon Explanation: A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and ... A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.

Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture. (A) Bound (B) Unbound (C) Critical (D) None of these

Description : Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture. (A) Bound (B) Unbound (C) Critical (D) None of these

Last Answer : (A) Bound

The vapour pressure of deliquescent substance is less or more than that of water vapours in air ?

Description : The vapour pressure of deliquescent substance is less or more than that of water vapours in air ?

Last Answer : Ans. Less than that of water vapours in air. 

Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture. (A) Free (B) Unbound (C) Equilibrium (D) Bound

Description : Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture. (A) Free (B) Unbound (C) Equilibrium (D) Bound

Last Answer : (C) Equilibrium

Pick out the wrong statement. (A) Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point (B) Entropy of a system decreases with the evolution of heat (C) Change of internal energy is negative for exothermic reactions (D) The eccentric factor for all materials is always more than one

Description : Pick out the wrong statement. (A) Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point (B) Entropy of ... is negative for exothermic reactions (D) The eccentric factor for all materials is always more than one

Last Answer : (D) The eccentric factor for all materials is always more than one

At the critical point of a substance (A) The surface tension vanishes (B) Liquid and vapour have the same density (C) There is no distinction between liquid and vapour phases (D) All (A), (B) and (C)

Description : At the critical point of a substance (A) The surface tension vanishes (B) Liquid and vapour have the same density (C) There is no distinction between liquid and vapour phases (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)