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.
