Statement-1 : When a metal is treated with conc. HNO₃ it
generally yields a nitrate, NO₂ and H₂O.
Statement-2 : Conc. HNO₃ reacts with metal and first
produces a metal nitrate and nascent hydrogen. The nascent
hydrogen then further reduces HNO₃ to NO₂.
Answers
Both Statements are true and Statement 2 is the correct explanation of Statement 1
Question - Assertion : When a metal is treated with conc. HNO₃ it
generally yields a nitrate, NO₂ and H₂O.
Reason : Conc. HNO₃ reacts with metal and first
produces a metal nitrate and nascent hydrogen. The nascent
hydrogen then further reduces HNO₃ to NO₂.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion (c) Assertion is correct, reason is incorrect (d) Assertion is incorrect, reason is correct.
Answer - with respect to HNO3, correct option is - (a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
HNO3 is commonly known as nitric acid is a strong acid. It is a good oxidising agent.
Nitric is corrosive in nature. Molecular weight of the acid is 63 g/mol. Central atom nitrogen in nitric acid has the highest oxidation number of +5.
The reaction of metal with nitric acid is given below -
M represents metal.
M + HNO3 --> MNO3 + [H]
[H] + HNO3 --> NO2 + H2O
H2O is water, NO2 is nitrogen dioxide, [H] is nascent hydrogen.