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

The decomposition of phosphine (PH₃) on tungsten at low pressure is a first-order reaction. It is because the

This reaction follows first-order kinetics. The rate constant at particular temperature is 2.303 × 10⁻² hour⁻¹. The initial concentration of cyclopropane is 0.25 M. What will be the concentration of cyclopropane after 1806 minutes? (log 2 = 0.3010)

For a first-order reaction, the rate constant is 6.909 min⁻¹ the time taken for 75% conversion in minutes is

In a first order reaction \[\ce{x -> y}\]; if k is the rate constant and the initial concentration of the reactant x is 0.1 M, then, the half life is

Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first-order reaction.

Reason: rate constant also doubles.

The rate constant of a reaction is 5.8 × 10⁻² s⁻¹. The order of the reaction is ____________.

If 75% of a first order reaction was completed in 60 minutes, 50% of the same reaction under the same conditions would be completed in ____________.

Describe the graphical representation of first order reaction.

Write the rate law for the following reaction.

A reaction that is `3/2` order in x and zero order in y.

Write the rate law for the following reaction.

A reaction that is second order in NO and first order in Br₂.

Give two examples for zero order reaction.

Identify the order for the following reaction.

Radioactive disintegration of ₉₂U²³⁸

The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?

A zero order reaction is 20% complete in 20 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?

From the following data, show that the decomposition of hydrogen peroxide is a reaction of the first order:

Where t is the time in minutes and V is the volume of standard KMnO₄ solution required for titrating the same volume of the reaction mixture.

A first order reaction is 40% complete in 50 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?

Define the ionic product of water. Give its value at room temperature.

How many faradays of electricity are required for the following reaction to occur

\[\ce{MnO^-_4 -> Mn^2+}\]

A current strength of 3.86 A was passed through molten Calcium oxide for 41minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is (atomic mass of Ca is 40g/mol and 1F = 96500 C).

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because ____________.