JEE Main & Advanced
Chemistry
Redox Reactions / रेडॉक्स अभिक्रियाएँ
Question Bank
Oxidizing and Reducing agent
question_answer
Which substance is serving as a reducing agent in the following reaction \[14{{H}^{+}}+C{{r}_{2}}O_{7}^{2-}+3Ni\to 2C{{r}^{3+}}+7{{H}_{2}}O+3N{{i}^{2+}}\] [CBSE PMT 1994; AFMC 2000; DPMT 2001]
A) \[{{H}_{2}}O\]
B) \[Ni\]
C) \[{{H}^{+}}\]
D) \[C{{r}_{2}}O_{7}^{2-}\]
Correct Answer:
B
Solution :
The oxidation number of Ni changes from 0 to \[+1\]