Thermal Dissociation of Nitric Acid

Q.

Pure nitric acid is unstable to heat or sunlight.

1. True

2. False

Q. (a) in Contact process, sulphur dioxide can be oxidised to sulphur trioxide in the presence of platinised asbestos which acts as a catalyst. The reaction is exothermic. Explain what is meant by the terms in Italics.
(b) Give examples of the use of sulphuric acid.
(i) As an electrolyte In everyday use.
(ii) As non-volatile acid.
(iii) As an oxidising agent.
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Q.

Identify the Gas D is a colourless gas which can be used as a bleaching agent.

1. Nitrous oxide

2. Ammonia

3. Carbon dioxide

4. Chlorine

5. Sulphur dioxide

6. Nitric oxide

Q.

Products obtained when Conc.$HN{O}_3$ (Nitric acid ) is heated.

1. $NO$, $H_{2}O$ and $O_2$.

2. $NO$, $H_{2}O$ and some heat.

3. $N{O}_2$, $H_{2}O$ and $O_2$.

4. $NO$, $H_2$ and $O_2$.

Q. Thermal decomposition of $HN{O}_3$ releases yellow-brown coloured fumes due to the formation of gas.

1. $N{O}_2$
2. $N{O}_3$
3. $O_2$

Q. Thermal decomposition of $HN{O}_3$ releases yellow-brown coloured fumes due to the formation of gas.

1. $N{O}_2$
2. $N{O}_3$
3. $O_2$

Q.

Pure nitric acid becomes unstable if exposed to high temperature or sunlight.

1. True

2. False

Q.

Nitrous acid $HN{O}_2$ decomposes to both $NO$ and $N{O}_2$.

1. True

2. False

Q.

Nitrous acid $HN{O}_2$ can decompose to $NO$ and $N{O}_2$.

1. True

2. False

Q.

Which gases are evolved in the thermal dissociation of nitric acid?

1. Nitrogen

2. Nitrogen dioxide

3. Nitrous oxide

4. Oxygen

Q.

Which of the following represents a decomposition reaction?

1. $A+B\to AB$

2. $A+B\to B+C$

3. $AB\to A+B$

4. $A+B+C\to X+Y$

Q. The colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle is :

1. yellow
2. black
3. blue
4. brown

Q. Give an example of a reaction where heat is involved.

Q. When sulfur dioxide is bubbled through water, which of the following compounds is obtained?

1. Sulfurous acid
2. Sulfuric acid
3. Hyposulfuric acid
4. Anhydrous sulfuric acid
5. Persulfuric acid

Q.

Products obtained when Conc.$HN{O}_3$ (Nitric acid ) is heated.

1. $NO$, $H_{2}O$ and some heat.

2. $N{O}_2$, $H_{2}O$ and $O_2$.

3. $NO$, $H_{2}O$ and $O_2$.

4. $NO$, $H_2$ and $O_2$.