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. $Pb{l}_4$

Which is not correct about $B{F}_3$?

1. It is stronger Lewis acid than $BC{l}_3$

2. It does not form dimer like $A{l}_{2}C{l}_6$

3. It can combine with $F^{-}$ ion to form $B{F}_4^{-}$ ion

4. It contains back $\mathrm{\pi }$- bonding 

Which of the following regarding Boron nitride is correct?

1. Its structure is similar to diamond in which both 'B' and 'N' $s{p}^3$ hybridised

2. Its structure is similar to graphite in which both 'B' and 'N' $s{p}^2$ hybridised

3. BN posses linear structure

4. BN is ionic, hence non-directional in nature

Which of the following option is correct?