From the following list of substances, choose one substance in each case which matches the description given below: [4 MARKS]
Ammonium nitrate, calcium hydrogen carbonate, copper carbonate, lead nitrate, potassium nitrate, sodium carbonate, sodium hydrogen carbonate, zinc carbonate
(a) A nitrate which gives out only oxygen when heated.
(b) A nitrate which on heating decomposes into dinitrogen oxide [nitrous oxide] and steam.
(c) A nitrate which gives off oxygen and nitrogen dioxide when heated.

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Solution

Choosing: 3 Marks
Equations: 1 Mark

(a) Potassium nitrate, $K N O_{3}$
$2 K N O_{3} Δ \to 2 K N O_{2} + O_{2} ↑$

(b) Ammonium nitrate, $N H_{4} N O_{3}$
$N H_{4} N O_{3} Δ \to N_{2} O (g) + 2 H_{2} O (g)$

(c) Copper nitrate, $C u (N O_{3})_{2}$
$2 (C u N O_{3})_{2} Δ \to 2 C u O + 4 N O_{2} + O_{2}$

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From the following list of substances. choose one substance in each case which matches the description given below :

Ammonium nitrate, calcium hydrogen carbonate, copper carbonate, lead nitrate, potassium nitrate, sodium carbonate, sodium hydrogen carbonate. zinc carbonate.

(a) A nitrate which gives off only oxygen when heated.

(b) A nitrate which on heating decomposes into dinitrogen oxide [nitrous oxide] and steam.

Q. Give equations for the following conversions:
(i) Sodium to sodium hydroxide using water.
(ii) Steam to hydrogen using burning magnesium.
(iii) Dilute sulphuric acid to hydrogen using zinc.
(iv) Mercuric oxide to mercury.
(v) Silver oxide to silver.
(vi) Copper hydroxide to copper oxide.
(vii) Calcium hydroxide to calcium oxide.
(viii) Lead carbonate to lead.
(ix) Potassium nitrate to oxygen.
(x) Copper nitrate to nitrogen dioxide.
(xi) Mercuric nitrate to mercury.
(xii) Silver nitrate to silver.

Name:

(a) A carbonate which does not decompose on heating.

(b) A nitrate which produces oxygen as the only gas.

(d) A nitrate which produces brown gas on heating.

Identify the odd one out and justify.

(a) Chloride, nitrate, hydride, ammonium

(b) Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia

(d) Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate

(e) Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride

(f) Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.

(g) Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.

(h) Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.

Q. From the list of substances given-Ammonium sulphate, Lead carbonate, chlorine, Copper nitrate, Ferrous sulphate -State a solution of the compound which gives a dirty green precipitate with sodium hydroxide.

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Choosing: 3 Marks Equations: 1 Mark (a) Potassium nitrate, KNO3 2KNO3Δ→ 2KNO2+O2↑ (b) Ammonium nitrate, NH4NO3 NH4NO3Δ→ N2O(g)+2H2O(g) (c) Copper nitrate, Cu(NO3)2 2(CuNO3)2Δ→ 2CuO+4NO2+O2