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The S-Block Elements

Question
CBSEENCH11007126
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Explain what happens when:
(i) Sodium hydrogen carbonate is heated
(ii) Sodium amalgam reacts with water
(iii) Fused sodium metal reacts with ammonia? 

Solution

(i) When sodium hydrogen carbonate is heated, sodium carbonate is formed.
   2 NaHCO subscript 3 space rightwards arrow with Heat on top space space Na subscript 2 CO subscript 3 space plus space CO subscript 2 space plus space straight H subscript 2 straight O
(ii)  Sodium amalgam reacts with water liberating hydrogen gas. 
(iii) When ammonium is passed through molten sodium, it yields sodamide evolving H2 gas.
2 Na plus 2 NH subscript 3 space rightwards arrow with 475 space straight K on top space 2 NaNH subscript 2 space plus space straight H subscript 2

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

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