The correct explanation for the lower atomic radius of Ga as compared to Al is -

1. Poor shielding effect of the 2d-electrons

2. Poor shielding effect of the 3d-electrons

3. Poor shielding effect of the 3p-electrons

4. Poor shielding effect of the 2s-electrons

Amphoteric oxides are:

1. ${\mathrm{Tl}}_2{\mathrm{O}}_3$, ${\mathrm{SiO}}_2$

2. ${\mathrm{CO}}_2$, ${\mathrm{B}}_2{\mathrm{O}}_3$

3. ${\mathrm{B}}_2{\mathrm{O}}_3$, ${\mathrm{SiO}}_2$

4. ${\mathrm{AI}}_2{\mathrm{O}}_3$, ${\mathrm{PbO}}_2$

When a metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl and forms compound (C). The compound (A) when heated strongly gives (D), which is used to extract the metal.

X, C & D are respectively - 

1. Aluminium, aluminium chloride, alumina

2. Aluminium, aluminium hydroxide, aluminium chloride

3. Aluminium hydroxide, aluminium chloride, aluminium

4. Aluminium hydroxide, aluminium chloride, sodium tetrahydroxoaluminate

An aqueous solution of Borax is-

1. Neutral

2. Amphoteric

3. Basic

4. Acidic

Boric acid is polymeric due to-

1. Its acidic nature.

2. The presence of hydrogen bonds.

3. Its monobasic nature.

4. Its geometry.

The hybridization of boron in diborane is-

1. sp

2. s${\mathrm{p}}^2$

3. s${\mathrm{p}}^3$

4. ds${\mathrm{p}}^2$

Thermodynamically the most stable form of carbon is-

1. Diamond

2. Graphite

3 Fullerenes

4. Coal

The incorrect statement among the given options is -

1. CO₂ can be prepared by the action of dilute hydrochloric acid on calcium carbonate. 

2. CO is prepared by the dehydration of formic acid with conc. H₂SO₄. 

3. CO₂ is commercially prepared by passing steam over hot coke. 

4. CO is commercially prepared by passing steam over hot coke. 

When hydrated alumina is treated with an aqueous NaOH solution, it gives-

1. ${\mathrm{NaAlO}}_2$

2. $\mathrm{Na}\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$

3. ${\mathrm{NaAl}}_2\mathrm{O}$

4. Both (2) and (3)

The correct reaction(s) among the following options is/are -

1. ${\mathrm{SiO}}_2 +\hspace{0.17em}4\mathrm{HF} \to {\mathrm{SiF}}_{4 }+ 2{\mathrm{H}}_2\mathrm{O}$

2. $\mathrm{ZnO} + \mathrm{CO} \to \mathrm{Zn} +\hspace{0.17em}{\mathrm{CO}}_2$

3. ${\mathrm{SiF}}_4 \hspace{0.17em}+ 2\mathrm{HF} \to {\mathrm{H}}_2{\mathrm{SiF}}_6$

4. All of the above