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21.

Why do alkali metals form blue coloured solution with NH₃?

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Potassium and Sodium are very reactive thus they form a compound with other elements.

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23.

What happens when a piece of sodium is put in water? Give also balanced equation for the reaction.

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24.

Why sodium catches fire when dropped in water?

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25.

Name the alkali metals which form superoxides when heated in excess of air.

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26.

Which of the following alkali metal is having least melting point?
(i) Na (ii) K (iii) Rb (iv) Cs

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27. Which one of the following alkali metal gives hydrated salts?

(i) Li (ii) Na (iii) K (iv) Cs

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28.

Arrange the following in decreasing order of ionic character: MF, MCl, MBr, MI where M reprents a metal.

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29.

Name the method for the extraction of sodium metal.

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30.

What is electrolyzed in Down’s process to obtain sodium?

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