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The s-Block Elements

Short Answer Type

21.

Why do alkali metals form blue coloured solution with NH₃?

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22.

Why sodium and potassium are not found in the native state?

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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

Cesium (Cs), This is because as the size of the metal increases, the strength of metallic bonding decreases and hence its meling point decreases. Since the size of Cs is the biggest, therefore its melting point is the lowest.

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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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Previous Year Papers

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Test Yourself

Short Answer Type

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

26.
Which of the following alkali metal is having least melting point?
(i) Na (ii) K (iii) Rb (iv) Cs