ICSE Class 9 Chemistry Question Paper. We covered all the ICSE Class 9 Chemistry Question Paper in this post for free so that you can practice well for the exam.
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ICSE Class 9 Chemistry Objective Question Paper for Students
When the initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is
(A) Zero
(B) First
(C) Second
(D) More than zero but less than first
Option b – First
Which one of the following statements is not correct?
(A) Catalyst does not initiate any reaction
(B) The value of the equilibrium constant is changed in the presence of a catalyst in the reaction equilibrium
(C) Enzymes catalyze mainly biochemical reactions
(D) Coenzymes increase the catalytic activity of the enzyme
Option b – The value of the equilibrium constant is changed in the presence of a catalyst in the reaction equilibrium
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
(A) Rate is proportional to the surface coverage
(B) Rate is inversely proportional to the surface coverage.
(C) Rate is independent of the surface coverage.
(D) Rate of decomposition is very slow.
Option a – Rate is proportional to the surface coverage
The units of the Arrhenius constant must be equal to
(A) Rate constant
(B) Activation of energy
(C) Threshold energy
(D) Probability factor
Option a – Rate constant
If the rate of constant for a first-order reaction is k, the time (t) required for the completion of 99% of the reaction is given by
(A) t = 6.909/k
(B) t = 4.606/k
(C) t = 2.303/k
(D) t = 0.693/k
Option b – t = 4.606/k
We covered all the icse class 9 chemistry question paper above in this post for free so that you can practice well for the exam.
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