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p-Block Elements (Group 13 & 14)

AIPMT 2007MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2007

Which of the following anions is present in the chain structure of silicates?

  1. (Si2O52-)n
  2. (SiO32-)n
  3. SiO44-
  4. Si2O76-

Answer

(2) (SiO32-)n

Solution

In chain silicates (pyroxenes) each SiO4 tetrahedron shares two of its oxygen atoms with the neighbouring tetrahedra.

So each Si has 2 shared O (2 12 = 1) and 2 unshared O, i.e. 3 O in all, and the repeating unit is SiO3 with charge 4 + 3(-2) = -2.

∴ The chain anion is (SiO32-)n.

( SiO44- = orthosilicate, Si2O76- = pyrosilicate, (Si2O52-)n = sheet silicate.)

Answer: (2)

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Ques. 2AIPMT 2004

Which one of the following statements about the zeolite is false?

  1. They are used as cation exchangers.
  2. They have open structure which enables them to take up small molecules.
  3. Zeolites are aluminosilicates having three dimensional network.
  4. Some of the SiO44- units are replaced by AlO45- and AlO69- ions in zeolites.
Ques. 3AIPMT 2003

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
Ques. 4AIPMT 2001

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+
Ques. 5AIPMT 2000

Which compound is electron deficient?

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

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