Q.

One property of ammonia is –

A. It is insoluble in water
B. it is a odourless gas
C. It is a yellowish gas
D. Its aqueous solution turns red litmus blue
Answer» D. Its aqueous solution turns red litmus blue
Explanation: The main use of litmus is to test whether a solution is acidic or basic. For instance, ammonia gas, which is alkaline, colours the red litmus paper blue.
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