p-Block Elements (Group 13 & 14)

Identify the incorrect statement from the following:

1. Oxygen exhibits only −2 oxidation state.
2. The order of catenation property of Group 14 elements is C Si > Ge Sn.
3. Carbon has the ability to form pπ–pπ multiple bond with itself.
4. ECl3 (E = B and Al) is a monomer when E = B and a dimer when E = Al.

The correct statement is

1. Aluminium has five valence orbitals.
2. Boron has a maximum covalency of four.
3. Beryllium has three valence orbitals.
4. Magnesium has a maximum covalency of four.

Taking stability as the factor, which one of the following represents correct relationship?

1. InI3 > InI
2. AlCl > AlCl3
3. TlI > TlI3
4. TlCl3 > TlCl

Which of the following statements is not correct about diborane?

1. There are two 3-centre-2-electron bonds.
2. The four terminal B-H bonds are two centre two electron bonds.
3. The four terminal hydrogen atoms and the two boron atoms lie in one plane.
4. Both the boron atoms are sp2 hybridised.

Choose the correct statement:

1. Diamond and graphite have two dimensional network.
2. Diamond is covalent and graphite is ionic.
3. Diamond is sp3 hybridized and graphite is sp2 hybridized.
4. Both diamond and graphite are used as dry lubricants.

Na2B4O7 heat X + NaBO2 in the above reaction the product "X" is :

1. NaB3O5
2. H3BO3
3. B2O3
4. Na2B2O5

Identify the correct statements from the following :

1. A and C only
2. B and C only
3. C and D only
4. A, B and C only

Which of the following is incorrect statement?

1. GeX4 (X = F, Cl, Br, I) is more stable than GeX2
2. SnF4 is ionic in nature
3. PbF4 is covalent in nature
4. SiCl4 is easily hydrolysed

Which of the following species is not stable?

1. [Sn(OH)6]2-
2. [SiCl6]2-
3. [SiF6]2-
4. [GeCl6]2-

The correct order of atomic radii in group 13 elements is

1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < Tl < In
4. B < Ga < Al < In < Tl

Which one of the following elements is unable to form MF63- ion?

1. Ga
2. Al
3. B
4. In

It is because of inability of ns2 electrons of the valence shell to participate in bonding that

1. Sn2+ is oxidising while Pb4+ is reducing
2. Sn2+ and Pb2+ are both oxidising and reducing
3. Sn4+ is reducing while Pb4+ is oxidising
4. Sn2+ is reducing while Pb4+ is oxidising

Boric acid is an acid because its molecule

1. contains replaceable H+ ion
2. gives up a proton
3. accepts OH- from water releasing proton
4. combines with proton from water molecule.

AlF3 is soluble in HF only in presence of KF. It is due to the formation of

1. K3[AlF3H3]
2. K3[AlF6]
3. AlH3
4. K[AlF3H]

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

1. Al < Ga < In < Tl
2. Tl < In < Ga < Al
3. In < Tl < Ga < Al
4. Ga < In < Al < Tl

Which of the following is electron-deficient ?

1. (BH3)2
2. PH3
3. (CH3)2
4. (SiH3)2

Which of the following structure is similar to graphite?

1. B4C
2. B2H6
3. BN
4. B

Which of these is not a monomer for a high molecular mass silicone polymer?

1. Me3SiCl
2. PhSiCl3
3. MeSiCl3
4. Me2SiCl2

The basic structural unit of silicates is

1. SiO32-
2. SiO42-
3. SiO-
4. SiO44-

Which statement is wrong?

1. Beryl is an example of cyclic silicate.
2. Mg2SiO4 is orthosilicate.
3. Basic structural unit in silicates is the SiO4 tetrahedron.
4. Feldspars are not aluminosilicates.

Name the type of the structure of silicate in which one oxygen atom of [SiO4]4- is shared.

1. Linear chain silicate
2. Sheet silicate
3. Pyrosilicate
4. Three dimensional

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

1. BCl3 > BF3 > BBr3
2. BBr3 > BCl3 > BF3
3. BBr3 > BF3 > BCl3
4. BF3 > BCl3 > BBr3

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

1. Al < Ga < In < Tl
2. Tl < In < Ga < Al
3. In < Tl < Ga < Al
4. Ga < In < Al < Tl

The straight chain polymer is formed by

1. hydrolysis of CH3SiCl3 followed by condensation polymerisation
2. hydrolysis of (CH3)4Si by addition polymerisation
3. hydrolysis of (CH3)2SiCl2 followed by condensation polymerisation
4. hydrolysis of (CH3)3SiCl followed by condensation polymerisation

Which of the following oxidation states are the most characteristic for lead and tin respectively?

1. +2, +4
2. +4, +4
3. +2, +2
4. +4, +2

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

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

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.

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

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+

Which compound is electron deficient?

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