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Why is hydrogen gas not evolved, when metals react with dil. HNO,?bDefine Roasting

Answer»

Ans :- Nitric acid(HNO3) is a strong oxidising agent. TheHydrogen gasproduced during its reaction withmetalgets oxidised to H2O, henceno hydrogen gasis produced. Instead it evolvesnitricoxides such as NO2, NOetc.

Roasting is a process in metallurgy in which a sulfide ore is heated in air. The process may convert a metal sulfide to a metal oxide or to a free metal.



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