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p-Block Elements (Group 13 & 14) · Question 28

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

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.

⇒ per Si: 2 shared O (2 12 = 1) + 2 unshared O = 3 O

⇒ repeating unit SiO3 with charge 4 + 3(-2) = -2

∴ Chain anion: (SiO32-)n

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

Answer: (2)

AIPMT 2007

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

2

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.
AIPMT 2004
3

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
AIPMT 2003
4

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
5

Which compound is electron deficient?

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

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