A. Of very large activation energy of many bodies
B. Of low probability of many body collisions
C. Many body collisions are not favoured energetically
D. Of requirement of very large concentration for such reactions
Related Mcqs:
- Molecularity of an elementary reaction, P + Q → R + S is ____________________?
A. 1
B. 2
C. 3
D. 4 - The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are_______________?
A. 2 & 1
B. 11 & 2
C. 2 & 2
D. 1 & 1 - Molecularity of a reaction__________________?
A. Is always equal to the overall order of reaction
B. May not be equal to the order of reaction
C. Can’t have a fractional value
D. Both B. and C. - The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is________________________?
A. Backmix reactor
B. Plug flow reactor
C. Series of CSTR
D. PFR in series - Reactions with high activation energy are_____________________?
A. Very temperature sensitive
B. Temperature insensitive
C. Always irreversible
D. Always reversible - In which of the following gaseous phase reversible reactions, the product yield cannot be increased by the application of high pressure ?
A. N2 + O2 ⇌ 2NO
B. PCl3 + Cl2 ⇌ PCl5
C. N + 3H2 ⇌ 2NH3
D. 2SO2 + O2 ⇌ 2SO3 - The rate of reaction does not decrease appreciably as the reaction proceeds in case of ______________ reactions?
A. Autocatalytic
B. Exothermic
C. Endothermic
D. Autothermal - With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of ‘R’ in mixed reactor (for a given conversion of ‘A’) ?
A. Decreases
B. Increases
C. Increases linearly
D. Remain same - Exothermic reactions are best carried out in ________________?
A. A CSTR
B. CSTR in series
C. A plug flow reactor followed by CSTR
D. CSTR followed by a plug flow reactor - Which of the following chemical reactions will be favoured by low pressure ?
A. 2HI ⇌ H2 + I2
B. N2O2 ⇌ 2NO2
C. N2 + O2 ⇌ 2NO
D. None of these
