Match the following columns. Column I Column II (i) A gas turns acidified potassium dichromate from orange to green (a) Ethylene (ii) Gas obtained by the dehydration of ethanol. (b) S O 2 (iii) Gas obtained by roasting galena. (c) C O 2

(i) The colour of the potassium dichromate is orange. When SO 2 gas is passed through potassium dichromate, it turns orange to green. The chemical reaction involved is: K 2 Cr 2 O 7 + H 2 SO 4 + SO 2 → Cr 2 SO 4 3 Green + K 2 SO 4 + H 2 O (ii) Concentrated sulphuric acid reacts with alcohol and removes water and releases ethylene gas. C 2 H 5 OH Ethanol + H 2 SO 4 Conc . → C 2 H 4 Ethylene + H 2 O (ii) SO 2 gas is obtained when galena is roasted. 2 PbS s Galena + 3 O 2 g → 2 PbO g Lead oxide + SO 2 g Sulphur dioxide Column I Column II (i) A gas turns acidified potassium dichromate from orange to green (b) SO 2 (ii) Gas obtained by the dehydration of ethanol. (a) Ethylene (iii) Gas obtained by roasting galena. (b) SO 2

Match the following columns. Column I Column II (i) Brown ring test (a) F e S O 4 . N O (ii) Brown ring (b) N O 3 - (iii) Brown ring interfere (c) N O 2 - , l -

(i) Brown ring test is done to detect presence of NO 3 - (nitrate ion). (ii) Brown ring is formed due to the formation of nitroso ferrous sulphate compound FeSO 4 . NO . (iii) Presence of nitrite ion and iodide ion interfere the brown ring test. Column I Column II (i) Brown ring test (b) NO 3 - (ii) Brown ring (a) FeSO 4 . NO (iii) Brown ring interfere (c) N O 2 - , l -

Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.

Ammonia gas is obtained by treating ammonium chloride with calcium hydroxide. The balanced chemical equation is: Ca OH 2 Slaked lime + 2 NH 4 Cl Ammonium chloride → CaCl 2 + 2 H 2 O + 3 NH 3 ↑ Ammonia

State why for the preparation of nitric acid, the complete apparatus is made up of glass.

The apparatus used for the laboratory preparation of nitric acid are made of glass completely because the vapours of nitric acid are highly corrosive. They attack rubber, cork and plastics etc.

What is the type of salt formed when the reactants are heated at a suitable temperature for the preparation of nitric acid?

In the preparation of nitric acid, sodium sulphate salt is formed when the sodium nitrate and concentrated sulphuric acid are heated below 200 ° C . NaNO 3 + H 2 SO 4 Conc . → < 200 ° C NaHSO 4 Sodium bisulphate + HNO 3

Name the gas that is produced in the following case. Sulphur is oxidized by concentrated nitric acid.

When the nitric acid reacts with sulphur, nitric acid oxidizes sulphur to sulphuric acid and water is formed with the release of the nitrogen dioxide gas. S + 6 HNO 3 → H 2 SO 4 + 2 H 2 O + 6 NO 2

E M B I B E

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 44

MEDIUM

10th ICSE

IMPORTANT

Earn 100

Match the following columns.

Column I Column II

(i) Nitroso ferrous sulphate (a) Reddish brown

(ii) Nitric oxide (b) Brown black

(iii) Concentrated nitric acid comes in contact with skin. (c) Brown

(iv) ${N O}_{2}$ gas passed through acidified freshly prepared ferrous sulphate. (d) Yellow

	Column I		Column II
(i)	Nitroso ferrous sulphate	(a)	Reddish brown
(ii)	Nitric oxide	(b)	Brown black
(iii)	Concentrated nitric acid comes in contact with skin.	(c)	Brown
(iv)	${N O}_{2}$ gas passed through acidified freshly prepared ferrous sulphate.	(d)	Yellow

Important Questions on Study of Compounds

MEDIUM

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 45

Match the following columns.

	Column I		Column II
(i)	A gas turns acidified potassium dichromate from orange to green	(a)	Ethylene
(ii)	Gas obtained by the dehydration of ethanol.	(b)	$S O_{2}$
(iii)	Gas obtained by roasting galena.	(c)	$C O_{2}$