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Class 11
Chemistry
The p Block Elements
rationalise the given statements and give chemical...

Question:
Rationalise the given statements and give chemical reactions :

(i) Lead(II) chloride reacts with Cl₂ to give PbCl₄.

(ii) Lead(IV) chloride is highly unstable towards heat.

(iii) Lead is known not to form an iodide, PbI₄.

Answer:

(a) Lead belongs to group 14 of the periodic table. The two oxidation states displayed by this group is +2 and +4. On moving down the group, +2 oxidation state becomes more stable and +4 oxidation state becomes less stable. This is because of the inert pair effect. Hence, PbCl₄ is much less stable than PbCl₂. However, the formation of PbCl₄ takes place when chlorine gas is bubbled through a saturated solution of PlCl₂.

PbCl _2(s) + Cl_2(g) → PbCl_4(l)

(b) On moving down group IV, the higher oxidation state becomes unstable because of the inert pair effect. Pb (IV) is highly unstable and when heated, it reduces to Pb (II).

PbCl_4(l)→ PbCl _2(s) + Cl_2(g)

(c) Lead is known not to form PbI₄. Pb (+4) is oxidising in nature and I^-is reducing in nature. A combination of Pb(IV) and iodide ion is not stable. Iodide ion is strongly reducing in nature. Pb(IV) oxidises I^-to I²and itself gets reduced to Pb(II).

Pbl₄→ Pbl ₂+ l₂

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Question:
Rationalise the given statements and give chemical reactions :

(i) Lead(II) chloride reacts with Cl₂ to give PbCl₄.

(ii) Lead(IV) chloride is highly unstable towards heat.

(iii) Lead is known not to form an iodide, PbI₄.

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Question: Rationalise the given statements and give chemical reactions : (i) Lead(II) chloride reacts with Cl2 to give PbCl4. (ii) Lead(IV) chloride is highly unstable towards heat. (iii) Lead is known not to form an iodide, PbI4.

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Question:
Rationalise the given statements and give chemical reactions :

(i) Lead(II) chloride reacts with Cl₂ to give PbCl₄.

(ii) Lead(IV) chloride is highly unstable towards heat.

(iii) Lead is known not to form an iodide, PbI₄.