NEET 2019 | Chemical Kinetics Question 19 | Chemistry

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NEET 2019

MCQ (Single Correct Answer)

-1

For the chemical reaction
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
the correct option is :

$$ - {{d\left[ {{N_2}} \right]} \over {dt}} = 2{{d\left[ {N{H_3}} \right]} \over {dt}}$$

$$ - {{d\left[ {{N_2}} \right]} \over {dt}} = {1 \over 2}{{d\left[ {N{H_3}} \right]} \over {dt}}$$

$$3{{d\left[ {{H_2}} \right]} \over {dt}} = 2{{d\left[ {N{H_3}} \right]} \over {dt}}$$

$$ - {1 \over 3}{{d\left[ {{H_2}} \right]} \over {dt}} = -{1 \over 2}{{d\left[ {N{H_3}} \right]} \over {dt}}$$

NEET 2018

MCQ (Single Correct Answer)

-1

The correct difference between first and second order reactions is that

the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations

the half-life of a first-order reaction does not depend on [A]₀ ; the half-life of a second order reaction does depend on [A]₀

a first-order reaction can be catalysed; a second-order reaction cannot be catalysed

the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations

NEET 2018

MCQ (Single Correct Answer)

-1

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

is halved

is doubled

is tripled

remains unchanged.

NEET 2017

MCQ (Single Correct Answer)

-1

Mechanism of a hypothetical reaction
X₂ + Y₂ $$ \to $$ 2XY, is given below :
(i) X₂ $$ \to $$ X + X (fast)
(ii) X + Y₂ $$\rightleftharpoons$$ XY + Y (slow)
(iii) X + Y $$ \to $$ XY (fast)
The overall order of the reaction will be

1.5

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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution