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ICSE Class 10 Chemistry Question 3 of 69

Study of Compounds — Ammonia — Question 18

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18
Question

Question 18

State why an aq. soln. of NH3

(i) turns red litmus blue

(ii) is a weak base and a weak electrolyte.

Answer

(i) The alkaline behaviour of aq. soln. of ammonia [NH4OH] is due to the presence of hydroxyl ions [OH-]. Hence, the aq. soln. of ammonia turns red litmus blue.

(ii) The aq. soln. of ammonia [NH4OH] is alkaline. It undergoes partial dissociation in aq. soln. to give hydroxyl ions [OH-] in low concentration. Therefore, it is a weak base and a weak electrolyte.