Oxidation Number Method

Q.

Identify the products in the following reaction.

$2H_2{O}_2\to 2H_{2}O+O_2$

Q. Balance the following equation.
$HN{O}_3+H_{2}S⟶N{O}_2+H_{2}O+S$

Q.

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

$6F{e}^{2+}+C{r}_2{O}_7^{2-}+14H^{+}⟶6F{e}^{3+}+2C{r}^{3+}+$ ___________

1. 2

2. 4

3. 5

4. 7

Q. The Equivalent weight of $H_{3}P{O}_4$ in the reaction is :
$Ca(OH{)}_2+H_{3}P{O}_4\to CaHP{O}_4+2H_{2}O$ $(Ca=40,P=31,O=16)$

1. 49
2. 98
3. 32.66
4. 147

Q. In the reaction, ${3Cl}_2+{6OH}^{-}⟶{5Cl}^{-}+{{ClO}_3}^{-}+{3H}_{2}O$, chlorine is:

1. oxidised
2. reduced
3. oxidised as well as reduced
4. neither oxidised nor reduced

Q. Is $F{e}^{2+}$ oxidised to $F{e}^{3+}$ in aerated water ?
If yes enter 1, else enter 0.

Q. What is the oxidation number of $K$ in $K_{2}C{r}_2{O}_2$?

1. 1
2. 2
3. 4
4. 3

Q. State the term : (Do not give examples)
(f) The substance that can remove hydrogen and oxygen atoms in the ratio of 2:1 (in the form of water) from the compounds.

Q. Why does KMnO4 undergo different conversions with acidic, basic and neutral mediums?

Q. An oxidising agent or oxidant is that substance which undergoes reduction in a chemical reaction.

1. True
2. False

Q. When ${SO}_2$ is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chromium is

1. $+5$ to $+3$
2. $+4$ to $+2$
3. $+6$ to $+3$
4. $+7$ to $+2$

Q. $C{N}^{-}$ is oxidised by $N{O}_3^{-}$ in presence of acid:
$aC{N}^{-}+bN{O}_3^{-}+c{H}^{+}\to (a+b)NO+aC{O}_2+\frac{c}{2}{H}_{2}O$

1. 3, 7, 7
2. 3, 10, 7
3. 3, 10, 10
4. 3, 7, 10

Q. Is $F{e}^{2+}$ oxidised to $F{e}^{3+}$ in aerated water?