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Question

A student placed a pinch of solid sodium hydrogencarbonate on a strip of red litmus paper. He found that the colour of red litmus paper strip :
(1) turned green
(2) turned blue
(3) turned violet
(4) did not change

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Solution

Solid sodium hydrogen carbonate does not change the colour of litmus paper, as only ionic dissociation of molecules changes the colour of litmus paper.

Hence, the correct answer is option 4.

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