The correct statement regarding polymeric silicon dioxide is :

 

1.	Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms.
2.	Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms.
3.	Silicon atom is bonded to two oxygen atoms.
4.	These are double bonds between silicon and oxygen atoms.

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

The correct statement among the following is :

An element that cannot form ${\mathrm{MF}}_6^{3-}$ ion is-

The correct order of atomic radii of the 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 of the following compounds has a structure similar to graphite?

1. B
2. B₄C
3. B₂H₆
4. BN

A compound among the following that is least likely to behave as a Lewis base is:

The stability of the +1 oxidation state increases in the sequence:

1. Al <Ga<In<Tl

2. Tl<In<Ga<Al

3. In<Tl<Ga<Al

4. Ga<In<Al<Tl

Al₂O₃ can be converted to anhydrous AlCl₃ by heating:

1. $A{l}_2{O}_3$ $with$ $HCl$ $gas$

2. $A{l}_2{O}_3$ $$with NaCl in solid-state

3. a mixture of $A{l}_2{O}_3$ $$ and carbon in dry $C{l}_2$ gas

4. $A{l}_2{O}_3$ $$ with $C{l}_2$ gas