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Question

Which of the following is a redox reaction?


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

1048260_577906_ans_d9c6543190734dc1a130c57b38a7a4ee.png

Chemistry

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