Dry ice is

1.  Solid ${\mathrm{NH}}_3$

2.  Solid ${\mathrm{SO}}_2$

3.  Solid ${\mathrm{CO}}_2$

4.  Solid ${\mathrm{N}}_2$

In the following questions more than one correlation is possible between options of Column I and Column II. Make as many correlations as you can.

Match the species given in Column I with the hybridization given in Column II.

                Column I                                   Column II

(i) Boron in $[\mathrm{B}{\left(\mathrm{OH}\right)}_4{]}^{-}$                                 (a) ${\mathrm{sp}}^2$
(ii) Aluminium in ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$                       (b) ${\mathrm{sp}}^3$
(iii) Boron in ${\mathrm{B}}_2{\mathrm{H}}_6$                                        (c) ${\mathrm{sp}}^3{\mathrm{d}}^2$
(iv) Carbon in Buckminsterfullerene
(v) Silicon in ${\mathrm{SiO}}_4^{-}$
(vi) Germanium in ${\left[{\mathrm{GeCl}}_6\right]}^{2-}$

1. (i)→ (a), (ii) → (b), (iii) → (c), (iv) → (c) (v)→(b) (vi)→(a)

2. (i)→ (b), (ii) → (c), (iii) → (b), (iv) → (a) (v)→(b) (vi)→(c)

3. (i)→ (c), (ii) → (a), (iii) → (b), (iv) → (a) (v)→(c) (vi)→(b)

4. (i)→ (a), (ii) → (b), (iii) → (a), (iv) → (b) (v)→(c) (vi)→(a)

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