Preparation of Sulphur Dioxide

Q. The heating of concentrated sulphuric acid with copper turnings yields:

1. Copper sulphate
2. Copper hydroxide
3. Water
4. Sulphur dioxide

Q.

What happens when (a) Dilute sulphuric acid is poured on a copper plate? (b) Iron nails are placed in a copper sulfate solution? Write word equations of the reactions involved.

Q.

Sulphur when burnt in air forms________

Q.

List of Gases having different smell

Q.

Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Dilute hydrochloric acid was added to both the Parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

Q. Why do you get a pungent odour when a sulphur containing substance is burnt?

1. All the substance smell the same when burnt
2. Because sulphur dioxide is formed
3. Because of the carbon present in the substance
4. Because the substance gets heated up to smell like that.

Q.

Compound A is a black solid. When heated with dilute Sulphuric acid, the blue solution of B is formed. When the blue solution is treated with Sodium hydroxide solution, a blue precipitate of compound C is formed. When compound C is heated strongly, compound A is again formed. Name the compound A, B, and C.

Explain the chemical reactions and write the balanced chemical equation for the chemical changes that take place.

Q.

State what is a chemical reaction. A chemical reaction is often accompanied by external indications or characteristics which includes 1.colour change 2.effervesence or gas evolved 3. Evolution or absorption of heat 4. Formation of precipitate. With reference to each of the above indications, State the external indications seen during - 1. Addition of dilute acid to an active metal 2. Addition of dilute hydrochloric acid to silver nitrate. 3. Addition of water to quicklime. 4. Thermal decomposition of mercury(ll) oxide

Q. Copper turnings and concentrated are used in the preparation of sulphur dioxide.

1. sulphuric acid
2. sulphurous acid
3. sulphonic acid

Q. During the extraction of zinc from zinc blende, sulphur dioxide is obtained as a byproduct.

1. True
2. False

Q.

Which of the following is a suitable drying agent for hydrogen?

1. Both of the above

2. None of the above

3. $H_{2}S{O}_4$

4. $CaC{l}_2$

Q. Which among the following substances are used to prepare sulphur dioxide in the laboratory?

1. Copper turnings
2. Iron filings
3. Concentrated Sulphuric Acid
4. Concentrated Hydrochloric Acid

Q.

why does hydrogen gas gives out a pungent smell or a bad smell ?

Q. Identify the element Y in the following reaction.

$Y+2HCl\to 2NaCl+H_{2}O+S{O}_2$

1. $N{a}_{2}S$
2. $N{a}_{2}S{O}_2$
3. $N{a}_{2}S{O}_3$
4. $N{a}_{2}S{O}_4$

Q.

Which of the following can be used to synthesize $S{O}_2$ ?

1. $Fe{S}_2+O_2$

2. $FeS+O_2$

3. $H_{2}S+O_2$

4. $S+O_2$

Q. During the extraction of mercury from cinnabar, _______ gas is released.

1. carbon dioxide
2. sulphur dioxide
3. hydrogen
4. nitrogen dioxide