A student took solution X in a test-tube and added a few drops of universal indicator to it. The solution turned blue. On adding another solution Y to this test-tube drop-wise, the colour of solution changed to green. When a yet another solution Z was added, the solution turned yellow. Which of the following gives the correct conclusion of the student?
(1) X is acid, Y is base, Z is salt solution
(2) X is base, Y is acid, Z is acid
(3) X is acid, Y is base, Z is base
(4) X is base, Y is acid, Z is sugar solution

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Solution

Acids show blue colour with universal indicator, bases show red colour with universal indicator and neutral solution shows a green colour with the universal indicator. So from the given options X is a base as it shows blue colour, Y is a weak acid it shows green colour and Z shows yellow colour so it is also a weak acid.

Hence, the correct answer is option 2.

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