Q.

Which of the following Statements are correct for alkali metal Compoundsi)   Super oxides are paramagnetic in nature ii)  The basic strength of hydroxides increases down the groupiii)  Alkali metal carbonates  thermal stability increases  down the group iv)  Thermal stability of alkali metal hydrides increase down the group.

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a

(i),  (ii) only

b

(i),  (ii),  (iii) only

c

(ii), (iv) only

d

(ii),  (iii),  (iv)   only

answer is B.

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Detailed Solution

Super Oxide ion paramagnetic due to presence of unpaired electron π2p* orbitalDown the group thermal stability of carbonates of IA increasesDown the group metallic character increases and basic strength of hydroxides increasesThermal stability of Metal Hydrides decreases
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