p-Block Elements (Group 13 & 14)

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.

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

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

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

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

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

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

Which compound is electron deficient?

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