Q.
Balance the following chemical reaction . The coefficient of , and H+ in balanced reaction are ...., ...... and ..... respectively
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a
5, 2, 6
b
2, 5, 6
c
6, 5, 2
d
2, 6, 5
answer is B.
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Detailed Solution
MnO4-+SO3-2−>Mn+2+SO42- First half reaction M+7nO4−→Mn+2 To balance hydrogen atoms, add H+ ions to left side. MnO4−+8H+→Mn2++4H2O To balance charge, add electrons to left side. MnO4−+8H++5e−→Mn+2+4H2O Second half reaction SO3-2→SO4-2 To balance oxygen atom, add H2O left side. SO3-2+H2O→SO4-2 To balance hydrogen atom, add H+ ions to right side SO3-2+H2O→SO4-2+2H+ To balance charge, add electron to right side SO3-2+H2O→SO4-2+2H++2e− Multiplying equation 1 by 2 and equation 2 by 5 add, we get 2MnO4−+5SO3-2+6H+→2Mn+2+5SO4-2+3H2O
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