In the laboratory preparation of nitric acid- it can be obtained below 200- C or above 200- C- but the lower temperature is preferred- Give at least two reasons- -2 MARKS-

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Chemistry

Chemical Properties

In the labora...

Question

In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ} C$ or above $200^{\circ} C$ , but the lower temperature is preferred. Give at least two reasons. [2 MARKS]

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Solution

Each Reason: 2 Marks

Any Two:
The lower temperature is preferred due to the following reasons:
(i) The glass apparatus may break at higher temperature.
(ii) Some quantity of nitric acid gets decomposed at higher temperature.
(iii) At higher temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

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In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ}$ C or above $200^{\circ}$ C, but the lower temperature is preferred. Which of the following reason(s) is /are correct?

i. The glass apparatus may break at a higher temperature.

ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

iii. Some quantity of nitric acid gets decomposed at a higher temperature.

Q. Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above

200^{\circ} C

Q. (i) What is special feature of the apparatus that is used in the laboratory preparation of nitric acid?
(ii) Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above 200°C?

Q. (a) How is nitric acid prepared in laboratory?
(b) What is the purpose of conc. H₂SO₄ in the above preparation?
(c) Why is the temperature maintained at 200°C in the above reaction?
(d) Can we use conc. HCl in place of conc. H₂SO₄?

In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.
(i) Draw a diagram to show the arrangement used for the absorption of HCl in water.
(ii) Why is such an arrangement necessary? Give two reasons.
(iii) Write the chemical equation for the laboratory preparation of HCl gas when the reactants are:
(a) below 200°C
(b) above 200°C

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In the laboratory preparation of nitric acid, it can be obtained below 200∘C or above 200∘C, but the lower temperature is preferred. Give at least two reasons. [2 MARKS]

In the laboratory preparation of nitric acid, it can be obtained below $200^{\circ} C$ or above $200^{\circ} C$ , but the lower temperature is preferred. Give at least two reasons. [2 MARKS]