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CBSE Class 10 Answered

WHY DO ONLY MAGNESIUM AND MANGANESE DISPLACE HYDROGEN IN NITRIC ACID,WHILE OTHER ELEMENTS ARE OXIDISED BY NITRIC ACID?  
Asked by drbkarpagam | 28 Feb, 2019, 09:16: PM
answered-by-expert Expert Answer
Metals also react with nitric acid, but hydrogen gas is not evolved, because nitric acid is a strong oxidising agent. So, it oxidises the hydrogen to water and itself gets reduced to any nitrogen oxide. However, magnesium and manganese react with dilute nitric acid to evolve hydrogen gas.
 
Very dilute about 1% acid reacts with Mg and Mn at room temperature to give nitrates and hydrogen gas.
 
Mg + 2HNO3 → Mg(NO3)2 + H2 ↑
        (V. dil)
Mn + 6HNO3 → Mn(NO3)2 + H2 ↑
Answered by Ramandeep | 01 Mar, 2019, 11:32: AM

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