Borax bead test is responded by:

1.  Divalent metals

2.  Heavy metals

3.  Light metals

4.  Metal which forms coloured metaborates

Which of the following statements regarding germanium compounds is incorrect?

1. $\mathrm{Ge}{\left(\mathrm{OH}\right)}_2$ is amphoteric

2. ${\mathrm{GeCl}}_2$ is more stable than ${\mathrm{GeCl}}_4$

3. ${\mathrm{GeO}}_2$ is weakly acidic

4. GeCl₄ + 2HCl ⇄ H₂[GeCl₆]

The correct statement regarding polymeric silicon dioxide is :

Which of the following correctly describes  behavior of Sn²⁺ and Pb⁴⁺?

Select the correct order of atomic radii for the elements of Group 13.

1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < Tl < In
4. B < Ga < Al < In < Tl

The stability of the +1 oxidation state increases in the sequence:

1. Al <Ga<In<Tl

2. Tl<In<Ga<Al

3. In<Tl<Ga<Al

4. Ga<In<Al<Tl

Aluminium becomes passive in nitric acid because it-

1. Is a noble metal

2. Forms a thin film of oxide

3. Has a positive reduction potential

4.  None of the above

${\mathrm{AlCl}}_3$ on hydrolysis gives -

1. ${\mathrm{Al}}_2{\mathrm{O}}_3.{\mathrm{H}}_2\mathrm{O}$

2. $\mathrm{Al}{\left(\mathrm{OH}\right)}_3$

3. ${\mathrm{Al}}_2{\mathrm{O}}_3$

4. ${\mathrm{AlCl}}_3.6{\mathrm{H}}_2\mathrm{O}$

$\mathrm{RCl}$ $\underset{\mathrm{Si}}{\overset{\mathrm{cu}-\mathrm{powder}}{\to }}{\mathrm{R}}_2{\mathrm{SiCl}}_2\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }$
${\mathrm{R}}_2\mathrm{Si}{\left(\mathrm{OH}\right)}_2$ $\stackrel{\mathrm{condensation}}{\to }$ $\mathrm{A}$

Compound (A) is -

Which of the following statements regarding the relative stability of tin and lead compounds is incorrect?
 

1. PbX₂ is generally more stable than PbX₄.

2. PbCl₄ is less stable than SnCl₄, whereas PbCl₂ is more stable than SnCl₂.

3. PbCl₄ is less stable than SnCl₄.

4. Pb(II) is a good reducing agent, whereas Sn(II) is not.