1 ) An electrochemical cell consists of . . . . . . . half cells . A ) two , B ) three , C ) four , D ) None of these ,

1 ) An electrochemical cell consists of . . . . . . . half cells .

A ) two ,                                                      B ) three ,

C ) four ,                                                     D ) None of these ,

Correct Answer : -    A ) two ,

And each half cell consists of an electrode and an electrolyte .

 

2 ) CaCl2 is added to NaCl in Down's cell  to decrease the . . . . . . . . . . . . ,

A ) melting point ,                                                         B ) boiling point .

C ) freezing point .                                                        D ) None of these ,

Correct Answer : -   A ) melting point ,

 

3 ) Acetone is weakly polar . The attraction between acetone and ion will be weak . And NaCL has strong bonds , will not dissolve in acetone .

 

4 ) The main product of reaction of potassium with oxygen is : - KO2 .

 

5 ) The chemical formula for magnesite is : - MgCO3 .

 

6 ) Catalyst helps in a reaction by increasing rate of reaction .

 

7 ) Ionization energy of sodium is 496 k J / mole .

 

8 ) SnCl4 is a covalent compound .

 

9 ) Hydrides can be classified in . . . . . . . . . . ,

A ) 2 types .                                                         B ) 3 types  ,

C ) 4 types .                                                         D ) none of these ,

Correct Answer : -   B ) 3 types  ,

 

10 ) Alkane and alkynes are unsaturated hydro carbons with at least one double bond ( pi - bond ) . Where as alkane contains only sigma bond . And sigma bond is stronger than pi bond . So , alkane is less reactive than alkyne and alkenes .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .