Discussion
The pH of pure water is nearly 7. It will increase on the addition of
Answer: A
The pH rises on adding ammonia.
Ammonia is a weak base: \[\mathrm{NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-}\] The extra hydroxide lowers \([\mathrm{H^+}]\) and so raises the pH above 7. Cane sugar and common salt are neutral, and hydrochloric acid would lower the pH.
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