Efficiency of the catalyst depends on its (1) physical state (2) amount used (3) molecular state (4) number of free valencies

Efficiency of the catalyst depends on its (1) physical state (2) amount used (3) molecular state (4) number of free valencies
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Assertion :- Catalyst is more effective in powdered form. Reason :- Number of free valencies increase.

Description : Assertion :- Catalyst is more effective in powdered form. Reason :- Number of free valencies increase.

Last Answer : Assertion :- Catalyst is more effective in powdered form. Reason :- Number of free valencies increase. A ... D. If both Assertion & Reason are False.

(a) What are ‘groups’ and ‘periods’ in the ‘periodic table’? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic table. How do the following properties of M and N vary? Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Description : (a) What are groups' and periods' in the periodic table'? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic ... Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science

Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.

For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption. (A) Physical (B) Chemical (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption. (A) Physical (B) Chemical (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (B) Chemical

What is valencies of elements?

Description : What is valencies of elements?

Last Answer : The "valency" or valence of an element refers to the number ofoutermost electrons. It is indicative of the combining power ofthat element.

The Knudsen diffusivity is dependent on the (A) Molecular velocity only (B) Pore radius of the catalyst only (C) Molecular mean free path only (D) Molecular velocity and pore radius of the catalyst

Description : The Knudsen diffusivity is dependent on the (A) Molecular velocity only (B) Pore radius of the catalyst only (C) Molecular mean free path only (D) Molecular velocity and pore radius of the catalyst

Last Answer : (D) Molecular velocity and pore radius of the catalyst

A catalyst in a chemical reaction __________ free energy change in the reaction. (A) Increases (B) Decreases (C) Either (A) or (B); depends on the type of catalyst (D) Neither (A) nor (B)

Description : A catalyst in a chemical reaction __________ free energy change in the reaction. (A) Increases (B) Decreases (C) Either (A) or (B); depends on the type of catalyst (D) Neither (A) nor (B)

Last Answer : (C) Either (A) or (B); depends on the type of catalyst

The amount of energy required to produce a given degree of pulverisation depends primarily on a) Soil strength b) Energy utilisation efficiency of tool c) Both (a) and (b) d) None of the above

Description : The amount of energy required to produce a given degree of pulverisation depends primarily on a) Soil strength b) Energy utilisation efficiency of tool c) Both (a) and (b) d) None of the above

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Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as (A) DE = DM + DK (B) 1/DE = 1/DN + DK (C) DE = DM . DE (D) DE = DN/DE

Description : Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as (A) DE = DM + DK (B) 1/DE = 1/DN + DK (C) DE = DM . DE (D) DE = DN/DE

Last Answer : (B) 1/DE = 1/DN + DK

The reason why a catalyst increases the rate of reaction is that, it (A) Decreases the energy barrier for reaction (B) Increases the activation energy (C) Decreases the molecular collision diameter (D) None of these

Description : The reason why a catalyst increases the rate of reaction is that, it (A) Decreases the energy barrier for reaction (B) Increases the activation energy (C) Decreases the molecular collision diameter (D) None of these

Last Answer : (A) Decreases the energy barrier for reaction

Enzymes are(A) Proteins with high molecular weight (around 10,000)(B) Derived from living organisms(C) Catalyst for temperature sensitive reactions(D) All (A), (B) and (C)

Description : Enzymes are (A) Proteins with high molecular weight (around 10,000) (B) Derived from living organisms (C) Catalyst for temperature sensitive reactions (D) All (A), (B) and (C)

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In stratosphere, which of the following element acts as a catalyst in degradation of ozone a release of molecular oxygen ? (1) Carbon (2) Cl (3) Fe (4) Oxygen

Description : In stratosphere, which of the following element acts as a catalyst in degradation of ozone a release of molecular oxygen ? (1) Carbon (2) Cl (3) Fe (4) Oxygen

Last Answer : (2) Cl

Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it doesnot entail a chain mechanism.(A) Proportional to(B) Independent of(C) Inversely proportional to(D) Proportional to the square o

Description : Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of ... to (B) Independent of (C) Inversely proportional to (D) Proportional to the square o

Last Answer : (A) Proportional to

For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important (C) The catalyst does not form an intermediate complex with the reactant (D) The surface of the catalyst does not play an important role during reaction

Description : For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst ... with the reactant (D) The surface of the catalyst does not play an important role during reaction

Last Answer : (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

A substance which increases the efficiency of a catalyst is termed as: A. Promoter (Answer) B. Activator C. Retarder D. Super catalyst

Description : A substance which increases the efficiency of a catalyst is termed as: A. Promoter (Answer) B. Activator C. Retarder D. Super catalyst

Last Answer : A. Promoter (Answer)

In the manufacture of H2SO4 , vanadium catalyst as compared to platinum catalyst (A) Gives higher conversion efficiency (B) Has a longer life and is not poisoned by arsenic (C) Handles lower SO2 content gas (7 -10% SO2 ), thus increasing the capital cost of the plant (D) All (A), (B) and (C)

Description : In the manufacture of H2SO4 , vanadium catalyst as compared to platinum catalyst (A) Gives higher conversion efficiency (B) Has a longer life and is not poisoned by arsenic (C) Handles lower SO2 content gas (7 -10% SO2 ), thus increasing the capital cost of the plant (D) All (A), (B) and (C)

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

Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the (A) Physical nature, ash content and fineness of the coal (B) Amount of excess air supplied and load on the boiler (C) Type of burner and combustion chamber (D) All (A), (B) and (C)

Description : Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the (A) Physical nature, ash content and fineness of the coal (B) Amount of excess air supplied and load on the boiler (C) Type of burner and combustion chamber (D) All (A), (B) and (C)

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

Which property of soil depends upon the amount, size, shape, arrangement and mineral constituent. a. Physical b. Biological c. Taxonomic d. None of these

Description : Which property of soil depends upon the amount, size, shape, arrangement and mineral constituent. a. Physical b. Biological c. Taxonomic d. None of these

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The equilibrium constant of chemical reaction __________ in the presence of catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Can either increase or decrease (depends on the type of catalyst)

Description : The equilibrium constant of chemical reaction __________ in the presence of catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Can either increase or decrease (depends on the type of catalyst)

Last Answer : (C) Remain unaffected

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Description : Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation. ... waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Last Answer : (2) It is the balance between in-coming and outgoing radiation. Explanation: Incoming heat being absorbed by the Earth, and outgoing heat escaping the Earth in the form of radiation are both ... each passing year. This balance between incoming and outgoing heat is known as Earth's heat budget.

Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation (3) It is the radiation from the earth in the form of long waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Description : Which of the following options correctly explains the term heat budget? (1) It is a mode of transfer of heat through matter by molecular activity. (2) It is the balance between incoming and outgoing radiation ... waves. (4) It is the amount of heat which the surface of earth receives from the sun.

Last Answer :  It is the balance between incoming and outgoing radiation

A catalyst remains unchanged at the end of the reaction with regard to (a) Quality (b) Chemical composition (c) Physical state (d) Quantity and chemical composition

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Last Answer : ANSWER: X -- HEAT OF VAPORIZATION

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For an ideal gas, the internal energy depends upon its __________ only. (A) Molecular size (B) Temperature (C) Volume (D) Pressure

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The catalytic efficiency of two different enzymes can be compared by the (a) formation of the product (b) pH of optimum value (c) Km value (d) molecular size of the enzyme.

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State two factors on which efficiency of cooling tower depends.

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State any six factors on which efficiency of lighting depends.

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When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases

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Why only small amount of enzyme is needed to catalyst a reaction involving many molecules?

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Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value. A. Both A and R are true and R is the correct explanation of A B. Both A and R are true but R is not a correct explanation of A C. A is true but R is false D. A is false but R is true

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On what factors efficiency (thermal) of the steam plant depends?

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In a counter-current extractor, as the axial mixing increases, the extraction efficiency (A) Increases (B) Decreases (C) Remains unchanged (D) Depends on the pressure of the system

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Efficiency of screw depends upon lead of the screw. a) True b) False

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When the efficiency of the alternator is maximum or on what factor the efficiency of the alternator depends?

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Economics of 'Solvay Process' depends upon the efficiency of (A) Carbonating tower (B) Ammonia recovery (C) Ammonia recovery and size of the plant (D) Ammoniation of salt solution

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Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the (A) Two temperatures only (B) Pressure of working fluid (C) Mass of the working fluid (D) Mass and pressure both of the working fluid

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With increase in compression ratio, the volumetric efficiency of air compressor (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease (depends on the suction pressure)

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The ability of a driver to stop the vehicle moving with the designed speed, depends upon: (A) Perception time (B) Brake reaction time (C) Efficiency of the brakes (D) All the above

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Last Answer : Answer: Option D