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P Block Elements question

2010 · Shift 2 · Q19
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P Block Elements question

2010 · Shift 2 · Q19

JEE AdvancedChemistryP Block ElementsMCQ+8 / −1

All the compounds listed in Column I react with water. Match the result of the respective reactions with the appropriate options listed in Column II.

Column I Column II
(A) (CH3)2SiCl2 (P) Hydrogen halide formation
(B) XeF4 (Q) Redox reaction
(C) Cl2 (R) Reacts with glass
(D) VCl5 (S) Polymerisation
(T) O2 formation
  1. A
    (A)→(P); (B)→(P), (Q), (R), (T); (C)→(P); (D)→(P)
  2. B
    (A)→(P), (S); (B)→(P), (Q), (R), (T); (C)→(P), (Q); (D)→(P)
  3. C
    (A)→(P), (S); (B)→(P), (R), (T); (C)→(P), (Q); (D)→(P)
  4. D
    (A)→(P), (S); (B)→(P), (Q), (R); (C)→(P), (Q); (D)→(P)
View written solutionFree

Correct answer: B

  1. Analyze each compound with water

(A) (CH3)2SiCl2(CH_3)_2SiCl_2(CH3​)2​SiCl2​

Hydrolysis of dialkyl dichlorosilane:

(CH3)2SiCl2+2H2O→(CH3)2Si(OH)2+2HCl(CH_3)_2SiCl_2 + 2H_2O \rightarrow (CH_3)_2Si(OH)_2 + 2HCl(CH3​)2​SiCl2​+2H2​O→(CH3​)2​Si(OH)2​+2HCl

So, hydrogen halide formation occurs  (P)(P)(P).

Now the silanediol formed condenses:

n(CH3)2Si(OH)2→[−(CH3)2Si−O−]n+nH2On(CH_3)_2Si(OH)_2 \rightarrow [-(CH_3)_2Si-O-]_n + nH_2On(CH3​)2​Si(OH)2​→[−(CH3​)2​Si−O−]n​+nH2​O

This is polymerisation  (S)(S)(S).

Hence:

(A)→(P),(S)(A) \rightarrow (P), (S)(A)→(P),(S)

(B) XeF4XeF_4XeF4​

Hydrolysis of xenon tetrafluoride:

6XeF4+12H2O→2XeO3+24HF+4Xe+3O26XeF_4 + 12H_2O \rightarrow 2XeO_3 + 24HF + 4Xe + 3O_26XeF4​+12H2​O→2XeO3​+24HF+4Xe+3O2​

From this reaction:

  • HFHFHF is formed  hydrogen halide formation (P)(P)(P)
  • Xe changes oxidation state, so it is a redox reaction (Q)(Q)(Q)
  • HFHFHF reacts with glass (SiO2SiO_2SiO2​), so effectively the products react with glass (R)(R)(R)
  • O2O_2O2​ is formed  (T)(T)(T)

Hence:

(B)→(P),(Q),(R),(T)(B) \rightarrow (P), (Q), (R), (T)(B)→(P),(Q),(R),(T)

(C) Cl2Cl_2Cl2​

Chlorine reacts with water as:

Cl2+H2O⇌HCl+HOClCl_2 + H_2O \rightleftharpoons HCl + HOClCl2​+H2​O⇌HCl+HOCl

So hydrogen halide formation occurs  (P)(P)(P).

Also, chlorine undergoes disproportionation:

  • Cl2Cl_2Cl2​: oxidation state 000
  • In HClHClHCl: −1-1−1
  • In HOClHOClHOCl: +1+1+1

So this is a redox reaction  (Q)(Q)(Q).

Hence:

(C)→(P),(Q)(C) \rightarrow (P), (Q)(C)→(P),(Q)

(D) VCl5VCl_5VCl5​

Hydrolysis:

VCl_5 + H_2O \rightarrow  oxychlorides/oxide + HCl

The key result is formation of hydrogen halide (P)(P)(P).

No polymerisation, no oxygen formation, and no essential redox assignment here.

Hence:

(D)→(P)(D) \rightarrow (P)(D)→(P)
  1. Now compare with options

We found:

  • (A)→(P),(S)(A) \rightarrow (P), (S)(A)→(P),(S)
  • (B)→(P),(Q),(R),(T)(B) \rightarrow (P), (Q), (R), (T)(B)→(P),(Q),(R),(T)
  • (C)→(P),(Q)(C) \rightarrow (P), (Q)(C)→(P),(Q)
  • (D)→(P)(D) \rightarrow (P)(D)→(P)

This exactly matches Option B.


  1. Comparison with stored correct answer

Stored correct answer: B

Derived answer: B

So, the derived answer agrees with the stored correct answer.

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