The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns :
(1) red in I and blue in II
(2) blue in both
(3) blue in I and red in II
(4) red in I and pink in II

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Solution

Sodium bicarbonate is a base it turns red litmus to blue, Lemon juice (chemically it is citric acid) is an acid it turns blue litmus to red.

Hence, the correct answer is option 3.

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The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns : (1) red in I and blue in II (2) blue in both (3) blue in I and red in II (4) red in I and pink in II

Sodium bicarbonate is a base it turns red litmus to blue, Lemon juice (chemically it is citric acid) is an acid it turns blue litmus to red. Hence, the correct answer is option 3.

The test-tube I contains sodium bicarbonate soultion whereas test-tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns :
(1) red in I and blue in II
(2) blue in both
(3) blue in I and red in II
(4) red in I and pink in II

Sodium bicarbonate is a base it turns red litmus to blue, Lemon juice (chemically it is citric acid) is an acid it turns blue litmus to red.

Hence, the correct answer is option 3.