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521.

TEL minimise the knocking effect when mixed with petrol, it act as
(a)Positive catalyst
(b)Negative catalyst
(c)Auto catalyst
(d)Induced catalyst
Comment
Answer is: B

522.

The temperature at which the catalytic activity of the catalyst is maximum, is called
(a)Critical temperature
(b)Room temperature
(c)Absolute temperature
(d)Optimum temperature
Comment
Answer is: D

523.

If the reaction rate at a given temperature become slower then
(a)The free energy of activation is higher
(b)The free energy of activation is lower
(c)The entropy changes
(d)The initial concentration of the reactants remains constant
Comment
Answer is: A

524.

Represents a chemical change?
1. Magnetization of iron
2. Condensation of liquid
3. Burning of fuel
4. Rusting of iron
Select the correct.
(a)1 and 2
(b)2 and 3
(c)3 and 4
(d)1 and 4
Comment
Answer is: C

525.

An examples of an autocatalytic reaction is
(a)Hydrogenation of oil
(b)Decomposition of nitroglycerine
(c)Oxidation of Na2AsO3 in presence of Na2SO3
(d)Thermal decomposition of KClO3 in presence of MnO2
Comment
Answer is: B

526.

The catalyst used in the manufacturing of sulphuric acid by contact process is
(a)V2O5
(b)Al2O3
(c)MnO2
(d)Cr2O3
Comment
Answer is: A

527.

The ability of a catalyst to accelerates the chemical reaction is known as
(a)Positive catalyst
(b)Negative catalyst
(c)Activity
(d)Selectivity
Comment
Answer is: B

528.

The catalyst used in the manufacture of Hydrogen by Bosch process is
(a)Cr2O3
(b)Cu
(c)Fe2O3
(d)Fe2O3 + Cr2O3
Comment
Answer is: D

529.

Consider the following statements
1. kinetic energy is the energy of motion.
2. Potential energy is stored energy.
3. Fuel gases (as LPG) contain potential energy in their chemical bonds.
Which of the above are correct?
(a)Only 1
(b)Only 2
(c)1, 2 and 3
(d)None of the above
Comment
Answer is: C

530.

An increase in temperature increases which of the following?
1. The rate constant of a reaction.
2. The ionic product of water.
3. The equilibrium constant of an exothermic reaction.
Select the correct.
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2, and 3
Comment
Answer is: A

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