Because it is strong oxidising agent so, as soon as hydrogen gas is formed in the reaction between metals and dil. HNO₃, the nitric acid oxidises this hydrogen to water.

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(i)It turns lime water milky. (ii) it extinguishes burning splinter (iii) It dissolves in a solution of sodium hydroxide. (iv) It has a pungent odour.

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False, Displacement is the length of shortest path between initial and final position. So, its magnitude can never be greater than the distance travelled by it.