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Universal Indicator

Which of the ...

Question

Which of the following solutions should be put on a universal indicator paper so that its colour may change to green?
(1) Milk
(2) Common salt solution
(3) Baking soda solution
(4) Milk of magnesia

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Solution

The green colour of pH is shown by neutral molecules, so among the following options, common salt will show green colour.
Sodium chloride salt is formed from a strong acid hydrochloric acid and a strong base sodium hydroxide. Therefore, the aqueous solution of sodium chloride is neutral.

Hence, the correct answer is option 2.

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