SODIUM - PREPARATION - PROPERTIES
IIT JEE - NEET

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1) In organic reactions, sodium in liquid ammonia is used as …. 

(EAMCET 2001 ENGINEERING)

1) Reducing agent 

2) Hydrolyzing agent 

3) Oxidizing agent 

4) Precipitating agent

Solution:

Sodium is a strong electropositive element. In liquid ammonia, it loses valence electron that is solvated by ammonia molecules and used for reduction. 

Conclusion:

Correct option is "1".

Related questions

2) In the Castner's process for the extraction of sodium , the anode is made of ...... metal.

(Eamcet - 2003-E) 

1) Copper 

2) Iron 

3) Sodium 

4) Nickel

Solution:

 In Castner's process, anhydrous molted sodium hydroxide is electrolysed between iron cathode and nickel anode to get sodium metal.

Conclusion:

The correct option is "1".

3) Sodium amalgam is used as :

(Eamcet - 1996-E) 

1) Oxidising agent 

2) Catalyst 

3) Reducing agent 

4) Bleaching agent

Solution:

 Sodium amalgam is an alloy of sodium metal and mercury i.e., Na-Hg. It is used as reducing agent.

Conclusion:

The correct option is "3".

4) The oxidation state of sodium in sodium amalgam is:

(Eamcet - 1996-E) 

1) +1 

2) –1 

3) Zero 

4) +2

Solution:

 Sodium amalgam is a solution of Na and Hg. The oxidation states of Na is 0.

Conclusion:

The correct option is "3".

5) A solution of sodium in liquid ammonia is blue due to the presence of:

(Eamcet - 1995-M) 

1) Na atoms 

2) Ammonium ions 

3) Solvated Na⁺ ions 

4) Solvated electrons

Solution:

Sodium in liquid ammonia contain solvated electrons which are responsible for the blue color and also paramagnetic nature of these solutions.

Note: Solvated Na⁺ ions are also present but are not responsible for the color.

Conclusion:

The correct option is "4".

AdiChemistry IIT JEE

(new) Click here to see 3d Interactive Solved Question paper