Identify the following as molecule of element (ME) or molecule of compound (MC).

A) Sulphur dioxide B) Chlorine C) Hydrogen chloride

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Q. Which of the following represents a correct chemical reaction?
(a) nitrogen + oxygen ⟶ hydrogen oxide
(b) carbon + chlorine ⟶ potassium chloride
(c) sulphur + oxide ⟶ sulphur dioxide
(d) sodium + chlorine ⟶ magnesium chloride

Q. How will you identify?
(a) Chloride ion
(b) Chlorine gas
(c) Sulphur dioxide gas
(d) A soluble carbonate
(e) An amphoteric hydroxide

(a) A flask contains 3.2 g of sulphur dioxide. Calculate the following :
(i) The moles of sulphur dioxide present in the flask.
(ii) the number of molecules of sulphur dioxide present in the flask.
(iii) the volume occupied by 3.2 g of sulphur dioxide at STP.
(S = 32, O = 16)
(b) A n experiment showed that in a lead chloride solution 6.21 g of lead is combined with 4.26 g of chlorine. What is the empirical formula of this chloride?
(Pb = 2107; Cl = 35.5).

Write the balanced chemical equations of the following reactions.

(a) Sodium hydroxide + sulphuric acid $\to$ sodium sulphate + water

(b) Potassium bicarbonate + sulphuric acid $\to$ potassium sulphate + carbon dioxide + water

(d) Chlorine + sulphur dioxide + water $\to$ sulphuric acid + hydrogen chloride

(e) Silver nitrate $\to$ silver + nitrogen dioxide + oxygen

(f) Copper + nitric acid $\to$ copper nitrate + nitric oxide + water

(g) Ammonia + oxygen $\to$ nitric oxide + water

(h) Barium chloride + sulphuric acid $\to$ barium sulphate + hydrochloric acid

(i) Zinc sulphide + oxygen $\to$ zinc oxide + sulphur dioxide

(j) Aluminium carbide + water $\to$ aluminium hydroxide + methane

(k) Iron pyrites ( $F e S_{2}$ ) + oxygen $\to$ ferric oxide + sulphur dioxide

(l) Potassium permanganate + hydrochloric acid $\to$ potassium chloride + manganese chloride + chlorine + water

(m) Aluminium sulphate + sodium hydroxide $\to$ sodium sulphate + sodium meta aluminate + water.

(n) Aluminium + sodium hydroxide + water $\to$ sodium meta aluminate + hydrogen

(o) Potassium dichromate + sulphuric acid $\to$ potassium chloride + chromium chloride + water + chlorine.

(p) Sulphur + nitric acid $\to$ sulphuric acid + nitrogen dioxide + water.

(q) Sodium chloride + manganese dioxide + sulphuric acid $\to$ sodium hydrogen sulphate + manganese sulphate + water + chlorine.

Identify the following as molecules of elements (ME) or molecules of compounds (MC).

A. Helium
B. Methane
C. Sulphur dioxide

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Identify the following as molecule of element (ME) or molecule of compound (MC). A) Sulphur dioxide B) Chlorine C) Hydrogen chloride

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Identify the following as molecule of element (ME) or molecule of compound (MC).

A) Sulphur dioxide B) Chlorine C) Hydrogen chloride