Balancing Redox Reaction

Q. $A{s}_2{S}_3+\underset{–}{X}N{O}_3^{-}+\underset{–}{Y}{H}^{+}\to 2AS{O}_4^{3-}+\underset{–}{Z}N{O}_2+\underset{–}{A}S+2H_{2}O$ Here X, Y, Z and A respectively are

1. 10, 4, 10, 3
2. 4, 10, 3, 10
3. None of these
4. 5, 4, 5, 3

Q. $\underset{–}{X}M{n}_2^{7+}+\underset{–}{Y}{O}_7^{2-}\to \underset{–}{Z}M{n}^{4+}+\underset{–}{A}{O}_2$
X, Y, Z and A are stoichiometric coefficients.
Here, X, Y, Z and A are respectively

1. 44, 28, 12, 56
2. None of these
3. 20, 12, 56, 42
4. 12, 28, 42, 56

Q. An element X is strongly electropositive and an element Y is strongly electronegative. Both are univalent. The compound formed by their combination contains :

1. $X^{-},Y^{+}$
2. $X^{+},Y^{-}$
3. $X{Y}_2$ molecules
4. $X^{2+},Y^{2-}$

Q.

How many electrons lost or gained by Cr?
$C{r}_2{O}_7^{2-}\to C{r}^{3+}$

1. 5
2. 4
3. 2
4. 6

Q. State the following is oxidation reaction or reduction reaction:$S{n}^{4+}+2e^{-}\to S{n}^{2+}$

Q. $A{s}_2{S}_3+\underset{–}{X}N{O}_3^{-}+\underset{–}{Y}{H}^{+}\to 2AS{O}_4^{3-}+\underset{–}{Z}N{O}_2+\underset{–}{A}S+2H_{2}O$ Here X, Y, Z and A respectively are

1. None of these
2. 10, 4, 10, 3
3. 5, 4, 5, 3
4. 4, 10, 3, 10