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

Answer 1

Answer:

(4) did not change colour

Explanation:

Solid sodium hydrogencarbonate does not (H+ or OH- ions) changes the colour of litmus paper. As there is no presence of ions, hence the colour of the litmus paper does not change.

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