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p-Block Elements (Group 13 & 14) · Question 30

AIPMT 2003MCQEasy📈 Topic in 50% papers+4−1
1

Which one of the following compounds is not a protonic acid?

  1. B(OH)3
  2. PO(OH)3
  3. SO(OH)2
  4. SO2(OH)2

Answer

(1) B(OH)3

Solution

PO(OH)3 (H3PO4), SO(OH)2 (H2SO3) and SO2(OH)2 (H2SO4) release H+ from their O-H groups ⇒ protonic acids.

As per NCERT, boric acid is a weak monobasic acid; it is not a protonic acid but acts as a Lewis acid by accepting a hydroxyl ion:

B(OH)3 + 2HOH [B(OH)4]- + H3O+

∴ B(OH)3 is not a protonic acid.

Answer: (1)

AIPMT 2003

Keep practising — p-Block Elements (Group 13 & 14)

2

PbO2 PbO; G298 < 0 SnO2 SnO; G298 > 0 Most probable oxidation state of Pb and Sn will be

  1. Pb4+, Sn4+
  2. Pb4+, Sn2+
  3. Pb2+, Sn2+
  4. Pb2+, Sn4+
AIPMT 2001
3

Which compound is electron deficient?

  1. PCl3
  2. BCl3
  3. CCl4
  4. PCl5
AIPMT 2000

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