Chemistry Question Bank

The following data pertains to reaction between A and B : S. No. [A] mol L–1 [B] mol L–1 Rate (mol L–1 time–1) 1 1.0 × 10–2 2.0 × 10–2 2.0 × 10–4 2 2.0 × 10–2 2.0 × 10–2 4.0 × 10–4 3 2.0 × 10–2 4.0 × 10–2 8.0 × 10–4 W…

A reaction which is of first order w.r.t. reactant A, has a rate constant 6 min–1. If we start with [A] = 0.5 mol L–1, when would [A] reach the value of 0.05 mol L–1

T50 of first -order reaction is 10 min. Starting with 10 mol L–1, rate after 20 min is

Half-lives of a first order and a zero order reaction are same. Then the ratio of the initial rates of first order reaction to that of the zero order reaction is (a) 0.693

Hydrolysis of methyl acetate in aqueous solution has been studied by titrating the liberated acetic acid against sodium hydroxide. The concentration of the ester at different times is given below. t/min C/mol L-1 0.85…

The following data were obtained during the first order thermal decomposition of SO₂Cl₂ at a constant volume. 2(g) 2(g) 2(g) SO Cl SO Cl → Experimen t Time/s-1 Total pressure/atm 0.5 0.6 What is the rate of reaction w…

1 mL of ethyl acetate was added to a flask containing 20 mL of N/20 HCl maintained at 25 °C. 2 mL of the reaction mixture were withdrawn at different intervals and titrated with a standard alkali solution. The followi…

From the following data find rate constant of decomposition of H₂O₂ in aqueous solution Time (in minutes) Volume (in cc of KMnO₄) 22.8 13.3 8.25

For the reaction : sunlight H Cl 2HCl →

The rate of formation of NO₂ during the period 600 – 700 s is

The instantaneous rate of reaction at the beginning of the reaction is

Assertion (A): If the activation energy of a reaction is zero, temperature will have no effect on the rate constant. Reason (R): Lower the activation energy, faster is the reaction.

Assertion (A): The order of a reaction can have fractional value. Reason (R): The order of a reaction cannot be written from balanced equation of a reaction.

For a first order reaction A P, the temperature (T) dependent rate constant (k) was found to follow the equation 1 logk 6.0 T . The pre- exponential factor A and the activation energy Ea, respectively are: (a) 1.0 10 …

An endothermic reaction with high activation energy for the forward reaction is given by the diagram : (a) (b) (c) E E (d)

The potential energy diagram for a reaction R P → is given below o H of the reaction corresponds to the energy:

Ea and H values of reactions R1, R2, R3 and R4 carried out at the same temperature are as given below: R1 Ea = 40 kJ mol–1, H = – 80 kJ mol–1 R2 Ea = 20 kJ mol–1, H = – 30 kJ mol–1 R3 Ea = 60 kJ mol–1, H = + 40 kJ mol…

The first order rate constant for a certain reaction increases from 1.667 × 10–6 s–1 at 727ºC to1.667 × 10–4 s–1 at 1571ºC. The rate constant at 1150ºC, assuming constancy of activation energy over the given temperatu…

Assertion : For a reaction at equilibrium, the free energy for the reaction is minimum. Reason : The free energy for both reactants and products decreases and become equal.

When a gas “X” is dissolved in water, the heat is evolved. Then solubility of ‘X’ will increase at

Assertion :A catalyst does not influence the value of equilibrium constant. Reason : Catalyst influence the rate of both forward and backward reactions equally.

Assertion : If the equation for a reaction is reversed, the equilibrium constant is inverted and if the equation is multiplied by 2, the equilibrium constant is squared. Reason : The numerical value of equilibrium con…

For the reaction : N (g) O (g) NO(g) If pressure is increased by reducing the volume of the container, then

If for a particular reversible reaction : Kc = 57 at 355ºC and Kc = 69 at 450º, then

For exothermic reaction is Sº < 0, then the sketch of log K vs 1/T may be (a) (b) (c) (d)