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

Which of the following halide is least stable and has doubtful existence?

1. $CC{l}_4$

2. $PbC{l}_2$

3. $SiC{l}_4$

4. $Pb{l}_4$