Redox Reactions And Electrochemistry Ques 458

Question: In which reaction there is a change in valency [NCERT 1971; CPMT 1971]

Options:

A) $ 2NO_2,\to N_2O_4 $

B) $ 2NO_2+H_2O,\to ,HNO_2+HNO_3 $

C) $ NH_4OH,\to ,NH_4^{+}+O{{H}^{-}} $

D) $ CaCO_3,\to ,CaO+CO_2 $

Show Answer

Answer:

Correct Answer: B

Solution:

$ \overset{+4}{\mathop{2NO_2}},+H_2O\to HNO_2+\overset{+5}{\mathop{HNO_3}}, $ . In this reaction oxidation state changes.



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