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The S-Block Elements

Question
CBSEENCH11007120
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What is the action of heat on Na2CO3.10H2O?

Solution

On heating below 373K, it loses 9 molecules of water of crystallisation to form monohydrate (Na2CO3.H2O). On heating above 373K, the monohydrate changes to an anhydrous white powder called soda ash but does not decompose further.
       
Na subscript 2 CO subscript 3. space 10 straight H subscript 2 straight O space rightwards arrow with Below space 373 space straight K on top space Na subscript 2 CO subscript 3. space straight H subscript 2 straight O space plus space 9 straight H subscript 2 straight O space space space Na subscript 2 CO subscript 3. space straight H subscript 2 straight O space rightwards arrow with Above space 373 space straight K on top space Na subscript 2 CO subscript 3 space plus space straight H subscript 2 straight O

Some More Questions From The s-Block Elements Chapter

What are s-block elements?

Why are alkali metals not found in nature?

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

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?

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