Aluminium reacts with concentrated HCl and concentrated NaOH to liberate which of the following gases respectively-

1.	\(\mathrm{H}_2 ~\text{and} ~\mathrm{H}_2 \)	2.	\(\mathrm{O}_2 ~\text{and} ~\mathrm{O}_2 \)
3.	\(\mathrm{O}_2 ~\text{and} ~\mathrm{H}_2 \)	4.	\(\mathrm{H}_2 ~\text{and} ~\mathrm{O}_2 \)

Identify the correct statements among the following:

1. (a) and (c) only

2. (b) and (c) only

3. (c) and (d) only

4. (a), (b) and (c) only

Find the anion that cannot be formed by boron.
1. [BF₆]³⁻
2. BH₄⁻
3. B(OH)₄⁻
4. BO₂⁻

Why does carbon show a much greater tendency for catenation than lead?

1. Due to the smaller size of C than that of Pb

2. Due to the smaller size of Pb than that of C

3. Due to the smaller ionization energy of C than that of Pb

4. Due to the inert pair effect

${\mathrm{}}_{}$
Which of the following reactions cannot be used for the preparation of diborane, B₂H₆?

1. ${\mathrm{NaBH}}_4$ $$ $+$ ${\mathrm{I}}_2$ $\to$

2. ${\mathrm{BF}}_3$ $$ $+$ $\mathrm{NaH}$ $\to$

3. ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$ $$ $+$ ${\mathrm{H}}_2\mathrm{O}$ $\to$

4. ${\mathrm{Mg}}_3{\mathrm{B}}_2$ $+$ $\mathrm{dil}$ $\mathrm{HCl}\to$

${}_{}$
\(\mathrm{Al}_2 \mathrm{O}_3\) reacts with-

The most characteristic oxidation state for lead and tin is, respectively,:

1. +4, +2

2. +2, +4

3. +4, +4

4. +2, +2

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Which of the following correctly describes the acidic nature of H₃BO₃?

1. A Monobasic acid and a weak Lewis acid.

2. A Monobasic and a weak Bronsted acid..

3. A Monobasic and a strong Lewis acid.

4. A Tribasic and a weak Bronsted acid.

Which of the following substances is commonly known as dry ice?

1. Solid NH₃

2. Solid SO₂

3. Solid CO₂

4. Solid N₂

Which of the following represents the correct increasing order of ease of hydrolysis?

1. CCl₄ < SiCl₄ < PCl₅ < AlCl₃

2. AlCl₃ < CCl₄ < PCl₅ < SiCl₄

3. CCl₄ < AlCl₃ < PCl₅ < SiCl₄

4. CCl₄ < AlCl₃ < SiCl₄ < PCl₅