Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip:
(1) turned blue
(2) did not change
(3) turned green and suddenly yellow
(4) turned light pink

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Solution

Color of the strip didn't change because pH paper strip changes its color when the substance to be tested is in the ionic form. But, here the given substance, sodium bicarbonate is in solid form.

Hence, the correct answer is option 2.

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Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip: (1) turned blue (2) did not change (3) turned green and suddenly yellow (4) turned light pink

Color of the strip didn't change because pH paper strip changes its color when the substance to be tested is in the ionic form. But, here the given substance, sodium bicarbonate is in solid form. Hence, the correct answer is option 2.

Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip:
(1) turned blue
(2) did not change
(3) turned green and suddenly yellow
(4) turned light pink

Color of the strip didn't change because pH paper strip changes its color when the substance to be tested is in the ionic form. But, here the given substance, sodium bicarbonate is in solid form.

Hence, the correct answer is option 2.