Science (English Medium) Class 12 - CBSE Question Bank Solutions

Convert the following: 

Bromobenzene to benzoic acid

Calculate the λ⁰m for Cl- ion from the data given below:

∧⁰m MgCl₂ = 258.6 Scm² mol^-1 and λ⁰m Mg²⁺ = 106 Scm² mol^-1

Can we construct an electrochemical cell with two half-cells composed of ZnSO₄ solution and zinc electrodes? Explain your answer.

The cell constant of a conductivity cell is 0.146 cm^-1. What is the conductivity of 0.01 M solution of an electrolyte at 298 K, if the resistance of the cell is 1000 ohm?

Draw the structure of the major monohalo product in the following reaction:

Define “zero order reaction”.

In a first order reaction x → y, 40% of the given sample of compound remains unreacted in 45 minutes. Calculate rate constant of the reaction.

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond

What is the covalency of nitrogen in N₂O₅?

A reaction is second order in A and first order in B.

(i) Write the differential rate equation.

(ii) How is the rate affected on increasing the concentration of A three times?

(iii) How is the rate affected when the concentrations of both A and B are doubled?

Give an example each of a molecular solid and an ionic solid.

For a reaction: 

Rate = k

(i) Write the order and molecularity of this reaction.

(ii) Write the unit of k.

For the first order thermal decomposition reaction, the following data were obtained:

Time / sec               Totalpressure / atm

0                              0.30

300                          0.50

Calculate the rate constant

(Given: log 2 = 0.301, log3 = 0.4771, log 4 = 0.6021)

Write two factors that affect the rate of reaction.

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]²

How is the rate of reaction affected if the concentration of B is doubled?

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]²

What is the overall order of reaction if A is present in large excess?

For a reaction : 

(i) Write the order and molecularity of this reaction.

(ii) Write the unit of k.

For the hydrolysis of methyl acetate in aqueous solution, the following results were obtained :

(i) Show that it follows pseudo first order reaction, as the concentration of water remains constant.

(ii) Calculate the average rate of reaction between the time interval 30 to 60 seconds.

(Given log 2 = 0.3010, log 4 = 0.6021)

Write the IUPAC name of the given compound:

Write the names and structures of the monomers of the following polymers: Polyvinyl chloride