Chemistry Question Bank

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ethyl acetate was added to a flask containing 20 mL of N/20 HCl maintained at 25 °C. 2 mL of the reaction mixture were withdrawn at different intervals and titrated with a standard alkali solution.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 initial rates of reaction 3A + 2B + C → Products, at different initial concentrations are given below: Initial rate M s–1 [A]0 , M [B]0 , M [C]0 , M 5.0 × 10–3 0.010 0.005 0.010 5.0 × 10–3 0.010 0.005 0.015 1.0 × …

The hypothetical reaction A B 2AB; → follows the following mechanism Fast A A A, → Slow Fast A B AB B,A B AB. → → The order of the overall reaction is

The reaction of hydrogen and iodine monochloride is given as: H g 2ICl g 2HCl g I g → The reaction is of first order with respect to H₂ (g) and ICl(g), following mechanisms were proposed. Mechanism A: H g 2ICl g 2HCl …

For a certain reaction A → products, the t1/2 as a function of [A]0 is given as below: [A]0 (M) : 0.1 0.025 t1/2 (min) : 100 Which of the following is/are true ?

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 (A): In rate law, unlike in the expression for equilibrium constants, the exponents for concentrations do not necessarily match the stoichiometric coefficients. Reason (R): It is the mechanism and not the ba…

Choose the correct answer out of the following choices. Assertion (A): Most people think diamond is forever. Reason (R): Conversion rate of diamond to graphite is very low.

Collision theory is used to explain how chemical species undergo a reaction. Using this theory and the kinetic molecular model, which of the following does NOT influence the rate of a chemical reaction?

In most cases, for a rise of 10K temperature the rate constant is doubled to tripled. This is due to the reason that (a)collision frequency increases by a factor of 2 to 3. (b)fraction of molecules possessing threshol…

With passage of time, the concentration of reactants …A… and rate of reaction …B… . Here A and B are

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.

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)