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SECTION I (40 Marks)
Attempt all questions from this Section.
Question 1
(a) You are provided with the following substances
A. Lead chloride
B. Zinc sulphide C. Sodium carbonate
D. Lead Nitrate
E Ammonium carbonate E Calcium chloride
G Calcium sulphite
H. Zinc carbonate
1. Silver Nitrate
Choose one substance in each case which matches the description below:
(i) A normal salt formed when basic oxide and acidic oxide react.
(ii) An insoluble binary salt
(iii) Insoluble carbonate
(iv) An insoluble salt formed from two soluble salts,
(v) A salt which on heating leaves metal as residue.
(b) How will you identify the following salts: calcium chloride, lead chloride and zinc chloride?
(c) State your observations and write balanced equations.
(i) Sodium chloride solution is mixed with lead nitrate solution.
(ii) Ethylene gas is passed through a solution of bromine in carbon tetrachloride.
(iii) Sodium hydroxide is added to iron (III) sulphate solution.
(iv) Chlorine is passed through a solution of potassium iodide.
(v) Ammonia hydroxide solution is added to copper sulphate solution in excess.
time for the laboratory preparation of the following gases :​

Answer 1

Answer:

CaSO3( calcium sulphite) is a normal salt formed when CaO( basic oxide) and SO2( acidic oxide) reacts.

CaO + SO2 → CaSO3

(ii) Zinc sulphide (ZnS) is a binary salt which is insoluble in water.

(iii) Zinc Carbonate( ZnCO3) is an insoluble carbonate.

(iv) ZnSO4(aq) + Na2CO3(aq) → Na2SO4(aq) + ZnCO3(s)

Zinc sulphate and sodium carbonate both are soluble salts in water, but the product zinc carbonate is insoluble in water and is precipitated out.

(v) Silver nitrate decomposes when heated and gives silver metal

2 AgNO3(l) → 2 Ag(s) + O2(g) + 2 NO2(g)

Kindly ask the remaining questions in separate thread|

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