Oxidation Num...

Oxidation Number Method

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$x H_{2} S O_{4} + y S O_{2} + z N a_{2} C r O_{4} ⟶ C r_{2} (S O_{4})_{3} + a N a_{2} S O_{4} + b H_{2} O$

In the above reaction, x, y, z, a and b are?

2, 3, 2, 2, 2
2, 2, 2, 2, 2
4, 3, 2, 1, 0
0, 1, 2, 3, 4

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How many $H_{2} O$ should be added to the RHS of the following equation to balance number of oxygen atoms on the left ?

$6 F e^{2 +} + C r_{2} O_{7}^{2 -} + 14 H^{+} ⟶ 6 F e^{3 +} + 2 C r^{3 +} +$ ___________

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Q. For the following balanced equation :

a F e^{2 +} + b C r_{2} O_{7}^{2 -} + c H^{+} ⟶ d F e^{3 +} + e C r^{3 +} +

H_{2} O

The value of a+b+c+d+e+f is :

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Q. For the balanced chemical equation :

x H_{2} S O_{4} + y S O_{2} + z N a_{2} C r O_{4} ⟶ C r_{2} (S O_{4})_{3} + a N a_{2} S O_{4} + b H_{2} O

The value of x+y+z-a-b is :

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Q. A 4 mol mixture of Mohr’s salt and

F e_{2} (S O_{4})_{3}

requires 400 ml of

0.5 {M KMnO}_{4}

for complete oxidation in an acidic medium. The percentage of Mohr’s salt in the mixture is:

40 %
5 %
50 %
25 %

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Q. The number of moles of

K M n O_{4}

that will be needed to react completely with one mole of ferrous oxalate in an acidic solution is:

$\frac{1}{5}$
$\frac{3}{5}$
$\frac{2}{5}$
$\frac{4}{5}$

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Q. Find the equivalent weight of

K_{2} C r_{2} O_{7}^{2 -}

in the given reaction, if the molar mass of

C r_{2} O_{7}^{2 -}

is 'M' ?

K_{2} C r_{2} O_{7}^{2 -}^{+} C r^{3 +}

$\frac{M}{6}$
$\frac{M}{3}$
$M$
$2 M$

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Q. What are the stoichiometric coefficients in the balanced redox reaction only for the species in the unbalanced reaction respectively.This reaction is used by the Breathalyzer to detect ethyl alcohol in a driver's breath?

C_{2} H_{5} O H + C r_{2} O_{7}^{2 -} \to C H_{3} C O O H + C r^{3 +}

Reactants: 2, 2; products: 2, 4
Reactants: 3, 1; products: 3, 2
Reactants: 3, 2; products: 3, 4
Reactants: 3, 4; products: 3, 8

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Q. What would be the coefficient of

H^{+}

and

H_{2} O

respectively in the balanced net ionic equations for the given redox reactions in acidic solution:

S_{4} O_{6}^{2 -} (a q) + A l (s) \to H_{2} S (a q) + A l^{3 +} (a q)

20, 6
6, 20
10, 4
4, 10

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Q. The reaction of the permanganate ion with the oxalate ion in acidic solution forms manganese(II) ion and carbon dioxide. What is the stoichiometric coefficient in front of manganese(II) in the balanced redox equation?

M n O_{4}^{-} + C_{2} O_{4}^{2 -} \to M n^{2 +} + C O_{2}

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