When we heat borax strongly, then it will yield the compound(s)

1. NaBO₂

2. B₂O₃

3. Na₂B₄O₇

4. Both 1 and 2

In borax, the hybridised state of boron is

1. sp²

2. sp³

3. sp² as well as sp³

4. sp

The best reducing agent is

1. ${\mathrm{GeCl}}_2$

2. ${\mathrm{SnCl}}_2$

3. ${\mathrm{PbCl}}_2$

4. ${\mathrm{PbCl}}_4$

Which is incorrect?

1. $Pb{l}_2+l_2\to Pb{l}_4$

2. In diborane 'B' is $s{p}^3$ hybridised

3. Pyrosilicate contains $S{i}_2{O_7}^{6-}$

4. Borax has 8 mole of water of crystallisation per mole

The dissolution of $Al{\left(OH\right)}_3$ by a solution of NaOH results in the formation of

1. ${\left[Al{\left(H_{2}O\right)}_4\left(OH\right)\right]}^{2+}$

2. ${\left[Al{\left(H_{2}O\right)}_2{\left(OH\right)}_4\right]}^{-}$

3. $\left[Al{\left(H_{2}O\right)}_3{\left(OH\right)}_3\right]$

4. $\left[Al{\left(H_{2}O\right)}_6{\left(OH\right)}_3\right]$

Which of the following is the correct order of first ionisation energy of group-14 elements?

1. $C<Si<Ge<Sn<Pb$

2. $C>Si>Ge>Sn>Pb$

3. $C>Si>Ge>Sn<Pb$

4. $C>Si<Ge>Sn<Pb$

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