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Indicators and Universal Indicator

A student was...

Question

A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is :
(1) A
(2) B
(3) C
(4) D

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Solution

Formation of NaCl is an example of a neutralization reaction. It is formed by the reaction of strong acid and strong base. It has a neutral nature, so it shows a green colour with a universal indicator.

Hence, the correct answer is option 3.

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Indicators and Universal Indicator

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