Redox Reactions — Chemistry

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Question 1
EasyJEE

Oxidation number of Cr in K2Cr2O7\mathrm{K_{2}Cr_{2}O_{7}}:

A. +6+6
B. +5+5
C. +3+3
D. +2+2
Question 2
EasyJEE

Reduction involves:

A. Gain of electrons
B. Loss of electrons
C. Increase in oxidation number
D. Addition of oxygen
Question 3
EasyJEE

Which is a redox reaction?

A. Zn+CuSO4→ZnSO4+Cu\mathrm{Zn} + \mathrm{CuSO_{4}} \rightarrow \mathrm{ZnSO_{4}} + \mathrm{Cu}
B. NaOH+HCl→NaCl+H2O\mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{NaCl} + \mathrm{H_{2}O}
C. AgNO3+NaCl→AgCl+NaNO3\mathrm{AgNO_{3}} + \mathrm{NaCl} \rightarrow \mathrm{AgCl} + \mathrm{NaNO_{3}}
D. CaO+CO2→CaCO3\mathrm{CaO} + \mathrm{CO_{2}} \rightarrow \mathrm{CaCO_{3}}

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