1.

Arrange thefollowing compounds in thecorrect order of percentage of metallic element. (a) potassium hydroxide (b) potassium carbonate (c ) potassium bicarbonate (d) potassium sulphide

Answer»

`a gt b gt c gt d`
` b gt a gt c gt d`
` c gt b gt a gt d`
` d gt a gt b gt c`

Solution :(a) potassium hydroxide `to KOH`
% of potassium = `39/56 xx 100 = 69.64%`
(b) potassium CARBONATE ` to K_(2)CO_(3)`
% of potassium = `78/138 xx 100 = 56.52%`
(c ) potassium bicarbonate ` to KHCO_(3)`
% of potassium ` = 39/100 xx= 39%`
(d) potassium sulphide ` to K_(2)S`
% of potassium = `(39 xx 2)/110 xx 100 = 70.90%`
`:. ` increasing order is `(d) gt (a) gt (b) gt(c )`


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