Preparation of Sulphuric Acid: Contact Process

Q.

Caustic soda is the common name for -

1. Mg(OH)₂

2. KOH

3. Ca(OH)₂

4. NaOH

Q. Figure 10.2 shows the industrial preparation of nitric acid. [5 MARKS]

(a) What is the ratio of the reactants taken in the above process?
(b) Name the common name of this process.
(c) Name the catalyst used.
(d) Why should the gases entering the apparatus be pure?
(e) Where do they react? Also, give balanced reactions.

Q. Arrange the steps in the contact process in a proper sequence from top to bottom.

1. Production of ${\mathrm{SO}}_2$
2. Oxidation of $S{O}_2$
3. Absorption of ${\mathrm{SO}}_3$
4. Dilution of $H_2{S}_2{O}_7$

Q.

What is the molar ratio of sulphur to oxygen added to produce sulphur dioxide in the contact process?

1. 1:2

2. 2:1

3. 3:1

4. 1:3

Q.

Ozone is ____ to oxygen in sunlight.

1. reduced

2. oxidised

3. corroded

4. synthesised

Q.

For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in the cake,

(A) how will it affect the taste of the cake and why?

(B) how can baking soda be converted into baking powder?

(C) what is the role of tartaric acid added to baking soda?

Q.

Which property of sulphuric acid is made use of in the following:

1. Liberation of Sulphur from ${\mathrm{H}}_2\mathrm{S}$ with concentrated form
2. Charring of sugar with hot concentrated acid
3. Liberation of Carbon Monoxide from hot concentrated acid.

Q.

The action of cleaning of oily dirt by soap is based on -

1. solubility in water

2. hydrophilic property

3. hydrophobic property

4. presence of both hydrophilic and hydrophobic groups

Q. Which volatile acid is formed when concentrated sulphuric acid reacts with sodium chloride?

1. Sulphuric acid
2. Hydrochloric acid
3. Carbonic acid
4. Nitric acid

Q. Match the following stages of contact process to the products formed.

1. $2H_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)$
2. ${\mathrm{SO}}_2\left(g\right)$
3. $H_{2}S2O_7\left(l\right)$

Q.

erwrite the formulae and balance the following :

1) ammonium chloride + calcium hydoxide ----->calcium chloride + ammonium + water

2) zinc oxide + nitric acid -----> zinc nitrate + water

3) lead dioxide + hydrochloric acid -----> lead chloride + water + chlorine

4) iron + conc. sulphuric acid -----> iron(ii) sulphate + sulphur dioxide gas + water

5) calcium + water -----> calcium hydroxide + hydrogen

6) red lead -----> lead monoxide + oxygen

7) zinc + dil. sulphuric acid -----> zinc sulphate+ hydrogen

8) aluminium oxide + sulphuric acid -----> aluminium sulphate + water

9) ferrous sulphate + sodium hydoxide-----> ferrous hydroxide + sodium sulphate

10) calcium carbonate + hydrochloric acid -----> calcium chloride + water + carbon dioxide

Q.

The correct formula of oleum is :

1. $H_{2}S{O}_5$

2. $H_2{S}_2{O}_6$

3. $H_2{S}_2{O}_7$

4. $H_2{S}_2{O}_8$

Q.

Which of the following piece/s of equipment is required in the manufacturing of sulphuric acid?

1. Burner

2. Converter

3. Absorption tower

4. Magnetic furnace

Q. Which among the following substances is one of the key component for the industrial preparation of sulphuric acid by contact process?

1. Sulphur dioxide
2. Sulphur pentoxide
3. Nitric oxide
4. Sulphur monoxide

Q. What is the difference between quick lime, slaked lime and lime water

Q. Which planet has a high concentration of Sulphuric acid?

1. Mercury
2. Neptune
3. Mars
4. Venus

Q.

During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur.

S(l) + O₂(g) → SO₂(g)

2SO₂(g) + O₂(g) → 2SO₃(g)

SO₃(g) + H₂SO₄(l) → H₂S₂O₇(l)

Which of the following statements is true for all three of these reactions?

1. All occur at elevated pressures to ensure maximum yield.

2. All take place at high temperatures to increase the reaction rate

3. All are redox reactions

4. All are exothermic

Q.

The second step in the production of sulphuric acid(contact process) is given by the equation:

\(2SO_2 (g) + O_2(g) \rightleftharpoons 2SO_3(g)\)

Ideally, which conditions would increase the yield of this reaction?

1. High temperature, high pressure

2. Low temperature, low pressure

3. Low temperature, high pressure

4. High temperature, low pressure

Q.

Where can we find the use of HCl?

1. Refrigerant in ice plants

2. Extraction of glue from bones.

3. Manufacture of washing soda

4. Flavouring foods as vinegar

Q. During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur.

S(l) + O₂(g) → SO₂(g)

2SO₂(g) + O₂(g) → 2SO₃(g)

SO₃(g) + H₂SO₄(l) → H₂S₂O₇(l)

Which of the following statements is true for all three of these reactions?

1. All occur at elevated pressures to ensure maximum yield.
2. All take place at high temperatures to increase the reaction rate
3. All are redox reactions
4. All are exothermic

Q.

In what ratio does sulphur and oxygen need to be added in order to increase the yield of SO₂ in the contact process?

1. 1:2

2. 2:1

3. 3:2

4. 4:3

Q.

If you want to electrolyse concentrated $\mathrm{HCl}$, which of the following will you choose for making the anode?

1. Graphite

2. Aluminium

3. Iron

4. Copper

Q.

a)Name the gas in each of the following.

b) State one observation for each of the following.

Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

Q.

(a) A blackish brown coloured solid ‘A’ when fused with alkali metal hydroxides in presence of air, produces a

Q.

Name the catalyst that is used in the preparation of the oxygen gas.

Q. The crystals of ferrous sulphate are____________

1. blue in colour
2. colourless
3. pink in colour
4. pale green in colour

Q.

the colour of hydrated copper sulphate is