Chemistry 12 Chapter 7 Exemplar Solutions the P Block Elements Part 8

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VI. Long Answer Type

Question 70:

An amorphous solid “A” burns in air to form a gas “B” which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolourises acidified aqueous solution and reduces Identify the solid “A” and the gas “B” and write the reactions involved.

Answer:

Question 71:

On heating lead (II) nitrate gives a brown gas “A”. The gas “A” on cooling changes to colourless solid “B”. Solid “B” on heating with changes to a blue solid ‘C’. Identify ‘A’, ‘B’ and ‘C’ and also write reactions involved and draw the structures of ‘B’ and ‘C’.

Answer:

Structure N2O4

Structure N2O4

Structure N2O3

Structure N2O3

Question 72:

On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with of hydrogen in the presence of a catalyst gives another gas (C) which is basic in nature. Gas C on further oxidation in moist condition gives a compound (D) which is a part of acid rain. Identify compounds (A) to (D) and also give necessary equations of all the steps involved.

Answer:

(i)

(ii)

(iii)

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