Compound (B) is

1. $B_2{H}_6.2N{H}_3$

2. $B_3{N}_3{H}_6$

3. ${\left(BN\right)}_x$

4. $H_{3}B{O}_3$

Silica reacts with

1. $H_{2}S{O}_4$

2. $HN{O}_3$

3. HF

4. HCl

The correct statement is-

1. Inorganic benzene is less reactive than benzene

2. The hybridisation of two boron atom in borax is $s{p}^2$ and the other two boron atom is $s{p}^3$

3. Fullerene $\left(C_{70}\right)$ has 20 six membered rings  

4. All of the above

The maximum number of atoms in dibrone $\left(B_2{H}_6\right)$ lying in the same plane is

1. 8

2. 6

3. 4

4. 7

The purest and thermodynamically most stable allotrope of carbon respectively is

1. Fullerene, diamond 

2. Graphite, diamond

3. Fullerene, graphite

4. Diamond, fullerene

               $Al{F}_3+\underset{Excess}{KF}\to \overline{)A}$
$B{F}_3+\underset{Excess}{KF} \to \overline{)B}$

Compound $\overline{)A} and \overline{)B}$ are respectively

1. $K_{3}Al{F}_6 and KB{F}_4$

2. $KAl{F}_4 \& K_{3}B{F}_6$

3. $K_{3}Al{F}_6 and K_{3}B{F}_6$

4. $K_{2}Al{F}_4 \& KB{F}_4$

Boranes have general formula

1. $B_n{H}_{n+4}$

2. $B_n{H}_{n+6}$

3. $B_n{H}_{2n+2}$

4. Both (1) & (2)

The stability of dihalides of group 14 elements follow which of the order?

1. $SiC{l}_2<GeC{l}_2<PbC{l}_2<SnC{l}_2$

2. $GeC{l}_2<PbC{l}_2<SnC{l}_2<SiC{l}_2$

3. $SiC{l}_2<GeC{l}_2<SnC{l}_2<PbC{l}_2$

4. $GeC{l}_2<SiC{l}_2<PbC{l}_2<SnC{l}_2$

In the reaction $2B+6HN{O}_3\to \overline{)A}+6N{O}_2$

The product $\overline{)A}$ is

1. $B_2{O}_3$

2. $2HB{O}_3$

3. $2H_{3}B{O}_2$

4. $2H_{3}B{O}_3$

Which of the following is not correct about silicones?

1. They are chemically inert and water-repelling in nature

2. Lower silicons are oily liquids

3. They are used in making waterproof clothes

4. Good electrical conductor