In which of the following pairs, both the species are not isostructural?

1. SiCl_4, ${\mathrm{PCl}}_4^{+}$
2. Diamond, silicon carbide
3. $N{H}_3,$ $P{H}_3$
4. $Xe{F}_4,Xe{O}_4$

 

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence?
1. Ga<ln<Al<Tl
2. Al<Ga<ln<Tl
3. Tl<ln<Ga<Al
4. ln<Tl<Ga<Al

A compound among the following having a similar structure to graphite is:

1. B
2. B₄C
3. B₂H₆
4. BN

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

The basic structural unit of silicates is:

1. SiO₄^4–

2. SiO₃^2–

3. SiO₄^2–

4. SiO

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

Which of the following oxide is amphoteric?

1. CO₂ 

2. SnO₂

3. CaO 

4. SiO₂

Which of the following statements is incorrect?