Column I contain the gas evolved when hydrochloric acid is added to the compound given in Column II. Match the gas evolved corresponding to their compounds. Column I (Gas evolved) Column II (Compounds) (i) Chlorine (a) Sodium bicarbonate (ii) Carbon dioxide (b) Manganese (IV) oxide (iii) Sulphuric dioxide (c) Sodium thiosulphate

Manganese (IV) oxide oxidises concentrated hydrochloric acid and releases chlorine gas. MnO 2 Manganese ( IV ) oxide + 4 HCl Conc . → ∆ MnCl 2 + H 2 O + Cl 2 Chlorine Hydrochloric acid reacts with weak acid salt such as sodium bicarbonate and produces sodium chloride salt and water with the liberation of carbon dioxide gas. NaHCO 3 Sodium bicarbonatre + HCl Hydrochloric acid → NaCl Sodium chloride + H 2 O Water + CO 2 ↑ Carbon dioxide Hydrochloric acid reacts with sodium thiosulphate and produces sulphur dioxide and yellow precipitate of sulphur. Na 2 S 2 O 3 Sodium thiosulphate + 2 HCl Hydrochloric acid → 2 NaCl Sodium chloride + H 2 O Water + SO 2 Sulphur dioxide + S ↓ Sulphur Column I (Gas evolved) Column II (Compounds) (i) Chlorine (b) Manganese (IV) oxide (ii) Carbon dioxide (a) Sodium bicarbonate (iii) Sulphuric dioxide (c) Sodium thiosulphate

Match the following columns. Column I Column II (i) Ammonia + Carbon dioxide (a) Ammonium sulphate (ii) Ammonia + Oxygen in the presence of platinum (b) Nitric acid (iii) Ammonia + Sulphuric acid (c) Urea

Ammonia reacts with carbon dioxide at 150 ° C at 150 atm and produces urea. 2 NH 3 Ammonia + CO 2 Carbon dioxide → 150 atm 150 ° C NH 2 - CO - NH 2 Urea + H 2 O Ammonia reacts with oxygen in the presence of a platinum catalyst and oxidizes to nitric oxide, which in turn reacts with oxygen to produce nitrogen dioxide. The nitrogen dioxide formed is dissolved in water along with oxygen and forms nitric acid. Ammonia as a weak base reacts with sulphuric acid and forms ammonium sulphate salt. 2 NH 3 Ammonia + H 2 SO 4 Sulphuric acid → NH 4 2 SO 4 Ammonium sulphate Column I Column II (i) Ammonia + Carbon dioxide (c) Urea (ii) Ammonia + Oxygen in the presence of platinum (b) Nitric acid (iii) Ammonia + Sulphuric acid (a) Ammonium sulphate

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

(i) Nitroso ferrous sulphate FeSO 4 NO is a brown black compound formed at the junction of two liquids. (ii) In the brown ring test, the colour of the nitric oxide is reddish brown. (iii) Concentrated nitric acid reacts with the protein of skin and forms a yellow coloured compound called xanthoproteic acid. (iv) When a brown coloured nitrogen dioxide gas passed through acidified freshly prepared ferrous sulphate, nitroso ferrous sulphate compound is formed. Column I Column II (i) Nitroso ferrous sulphate (b) Brown black (ii) Nitric oxide (a) Reddish brown (iii) Concentrated nitric acid comes in contact with skin. (d) Yellow (iv) N O 2 gas passed through acidified freshly prepared ferrous sulphate. (c) Brown

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

The brown ring test is used for the detection of

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 40

Ammonium nitrate can be used in

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 41

The molecular formula of Epsom salt is

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 42

Column I contain the gas evolved when hydrochloric acid is added to the compound given in Column II. Match the gas evolved corresponding to their compounds.

	Column I (Gas evolved)		Column II (Compounds)
(i)	Chlorine	(a)	Sodium bicarbonate
(ii)	Carbon dioxide	(b)	Manganese (IV) oxide
(iii)	Sulphuric dioxide	(c)	Sodium thiosulphate

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 43

Match the following columns.

	Column I		Column II
(i)	Ammonia $+$ Carbon dioxide	(a)	Ammonium sulphate
(ii)	Ammonia $+$ Oxygen in the presence of platinum	(b)	Nitric acid
(iii)	Ammonia $+$ Sulphuric acid	(c)	Urea

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10th ICSE

IMPORTANT

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

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

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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)	$C O_{2}$

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 46

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)	$N O_{2}^{-}, l^{-}$

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10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 8 - Study of Compounds>CHAPTER EXERCISE>Q 47

Give a reason for the following.
Hydrogen chloride gas cannot be dried over quick lime.

The brown ring test is used for the detection of

Important Questions on Study of Compounds

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