HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol⁻¹ and y kJ mol⁻¹. Therefore , the energy of activation in the backward direction is

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200 K to 400 K? (R = 8.314 JK⁻¹mol⁻¹)

If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is ____________.

In a homogeneous reaction \[\ce{A -> B + C + D}\], the initial pressure was P₀ and after time t it was P. Expression for rate constant in terms of P₀, P and t will be

The correct difference between first and second order reactions is that

Explain the effect of catalyst on reaction rate with an example.

The rate law for a reaction of A, B and C has been found to be rate = `"k" ["A"]^2["B"] ["L"]^(3/2)`. How would the rate of reaction change when

1. Concentration of [L] is quadrupled
2. Concentration of both [A] and [B] are doubled
3. Concentration of [A] is halved
4. Concentration of [A] is reduced to `(1/3)` and concentration of [L] is quadrupled.

The rate of formation of a dimer in a second order reaction is 7.5 × 10⁻³ mol L⁻¹s⁻¹ at 0.05 mol L⁻¹ monomer concentration. Calculate the rate constant.

For a reaction \[\ce{x + y + z -> products}\] the rate law is given by rate = `"k" ["x"]^(3/2) ["y"]^(1/2)` what is the overall order of the reaction and what is the order of the reaction with respect to z.

How do concentrations of the reactant influence the rate of reaction?

How do nature of the reactant influence rate of reaction?

Benzene diazonium chloride in aqueous solution decomposes according to the equation \[\ce{C6H5N2Cl -> C6H5Cl + N2}\]. Starting with an initial concentration of 10 g L⁻¹, the volume of N₂ gas obtained at 50°C at different intervals of time was found to be as under:

Show that the above reaction follows the first order kinetics. What is the value of the rate constant?

How will you prepare Acetic anhydride from acetic acid?

How will you prepare Acetic anhydride from acetic acid?

How will you prepare Acetic anhydride from acetic acid?

How will you prepare Acetic anhydride from acetic acid?