Borax bead test is responded by:

1.  Divalent metals

2.  Heavy metals

3.  Light metals

4.  Metal which forms coloured metaborates

The incorrect statement among the following is -

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]

Silicon carbide is used as:

1.  Dehydrating agent

2.  Abrasive

3.  Solvent

4.  Catalyst

${\mathrm{R}}_3\mathrm{SiCl}$ on complete hydrolysis forms-

1.  ${\mathrm{R}}_3\mathrm{SiOH}$

2.  ${\mathrm{R}}_3\mathrm{Si}—\mathrm{O}—{\mathrm{SiR}}_3$

3.  ${\mathrm{R}}_3\mathrm{Si}=\mathrm{O}$

4.  None of the above

The percentage of lead in a lead pencil is-

1.  20

2.  0

3.  80

4.  70

Tin cry refers to- 

1.  Conversion of white to grey tin

2.  Tin plating

3.  Conversion of white tetrahedral tin to white rhombohedral tin

4.  Emission of sound while bending a tin rod

The correct statement regarding polymeric silicon dioxide is -

1.  Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

2.  Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

3.  Silicon atom is bonded to two oxygen atoms

4.  These are double bonds between silicon and oxygen atoms

AlF₃ is soluble in HF only in the presence of KF due to the formation of-

1.  ${\mathrm{K}}_3\left({\mathrm{AIF}}_3{\mathrm{H}}_3\right)$
2.  ${\mathrm{K}}_3\left({\mathrm{AIF}}_6\right)$
3.  ${\mathrm{AIH}}_3$
4.  $\mathrm{K}\left({\mathrm{AIF}}_3\mathrm{H}\right)$

The correct statement regarding inert pair effect is -

1. Sn²⁺ is an oxidizing agent while Pb⁴⁺ is a reducing agent

2. Sn²⁺ and Pb²⁺ both are oxidizing agents

3. Sn⁴⁺ is a reducing agent while Pb⁴⁺ is an oxidizing agent

4. Sn²⁺ is a reducing agent while Pb⁴⁺ is an oxidizing agent

An element that cannot form ${\mathrm{MF}}_6^{3-}$ ion is -
1. Ga
2. Al
3. B
4. In