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Q.
Which of the following will give $ {{H}_{2}} $ gas with dilute $ HN{{O}_{3}} $ ?
CMC MedicalCMC Medical 2009
Solution:
Mg, being the most reactive metal, gives $ {{H}_{2}} $ gas with dilute $ HN{{O}_{3}} $ while all other given elements react differently with dilute $ HN{{O}_{3}} $ . $ Mg+\underset{dilute}{\mathop{2HN{{O}_{3}}}}\,\xrightarrow{{}}Mg{{(N{{O}_{3}})}_{2}}+{{H}_{2}} $ $ 4Zn+\underset{dilute}{\mathop{10HN{{O}_{3}}}}\,\to 4Zn{{(N{{O}_{3}})}_{2}}+{{N}_{2}}O+5{{H}_{2}}O $ $ 3Cu+\underset{dilute}{\mathop{8HN{{O}_{3}}}}\,\to 3Cu{{(N{{O}_{3}})}_{2}}+2NO+4{{H}_{2}}O $ $ 6Hg+\underset{dilute}{\mathop{8HN{{O}_{3}}}}\,\to 3H{{g}_{2}}{{(N{{O}_{3}})}_{2}}+2NO+4{{H}_{2}}O $