Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

 Give reactions for the following: 
O – O single bond is weaker than S – S single bond. 

Write chemical equation in support of your answer. 
 Out of   Cl and  CH₂- Cl,  which one is more reactive towards nucleophilic substitution reaction and why? 

Write chemical equation in support of your answer. 
 Out of  Cl and O2N Cl. which one is more reactive  towards nucleophilic substitution reaction and why?

Arrange the following in order of the property indicated set.
HF, HCl, HBr, HI - decreasing bond enthalpy.

Out of (CH₃)₃ C-Br and (CH₃)₃ C-I, which one is more reactive towards S_N1 and why? 

Write the hybridization and magnetic character of the following complexes:
[Fe(H₂O)₆]²⁺
(Atomic no. of Fe = 26)

Write the hybridization and magnetic character of the following complexes:
[Fe(CO)₅]
(Atomic no. of Fe = 26)

Solve the following question.
A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO₄ and ZnSO₄ until 2.8 g of Fe deposited at the cathode of cell X. How long did the current flow? Calculate the mass of Zn deposited at the cathode of cell Y.
(Molar mass : Fe = 56 g mol^–1, Zn = 65.3 g mol^–1, 1F = 96500 C mol^–1)

Which one of the following is incorrect for an ideal solution?

Packing efficiency for simple cubic structure is ____________.

For ideal solution the enthalpy of mixing of the pure components to form the solution is ____________.

For ideal solution the volume of mixing of the pure components to form the solution is ____________.

The rate at which a solid dissolves in liquid does not depend on ____________.

Electrolytic cell uses electrical energy to bring about ____________.

According to Faraday’s First Law of Electrolysis, the amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the ____________.

Which metal is also found in sea beds?

Hinsberg’s reagent reacts with primary and secondary amines to form sulphonamides. This reagent is also known as:

p-toluenesulphonyl chloride does not react with ____________.

p-toluenesulphonyl chloride is used to:

Which of the following condition is not satisfied by an ideal solution?