Question

# Which of the following is a redox reaction?

A
Mg+HNO3Mg(NO3)2+NO2+H2O
B
KCl+AgNO3AgCl+KNO3
C
FeSO4+KClO3KCl+Fe2(SO4)3
D
BaCl2+Na2SO4BaSO4+NaCl

Solution

## The correct options are B $$Mg+HNO_3\rightarrow Mg(NO_3)_2+NO_2+H_2O$$ C $$FeSO_4 + KClO_3\rightarrow KCl + Fe_2(SO_4)_3$$$$B)$$ $$KCl+AgNO_3\longrightarrow AgCl+KNO_3$$,see the table B given there. No change in oxidation state. Therefore not a redox reaction .$$D)$$ $$BaCl_2+Na_2SO_4\longrightarrow BaSO_4 +NaCl$$It is a displacement reaction and displacement reactions are non-redox.$$C)$$ $$FeSO_4 +KClO_3\longrightarrow KCl+Fe_2{(SO_4)}_3$$ Look at the given table (c) where $$Fe$$ is oxidized and $$Cl$$ is reduced.$$\therefore$$ It is a redox reaction.$$A)$$ $$Mg+HNO_3\longrightarrow Mg{(NO_3)}_2+NO_2+H_2O$$Look at the table A, $$Mg$$ is oxidized from $$0$$ to $$+2$$ and $$N$$ is reduced from $$+5$$ to $$+4$$.$$\therefore$$ it is a redox reaction.Chemistry

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