No observable change is noticed when dilute hydrochloric acid is added to :
(1)sodium hydroxide solution(2)sodium carbonate solution
(3) blue litmus solution(4) zinc metal


Correct answer: (1) sodium hydroxide solution  

Explanation: When an acid (dilute hydrochloric acid) reacts with a base (sodium hydroxide), they neutralize each other to form salt and water. Hence, no observable change occurs.

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Updated on: 10-Oct-2022

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