The number of five-membered and six-membered rings in $C_{70}$ fullerene respectively is 

1. 12, 20

2. 12, 25

3. 15, 20

4. 10, 20

Linear silicones have the repeating unit of

1. $\left(RSiO\right)$

2. $\left(RSi{O}_2\right)$

3. $\left(R_{2}SiO\right)$

4. $\left(R_{2}Si{O}_2\right)$

${\left[{\mathrm{SIF}}_6\right]}^{2-}$ exists but ${\left[SiC{l}_6\right]}^{2-}$ does not exist because 

1. Smaller size of F than Cl

2. F is more electronegative than Cl 

3. Interaction of F lone pair electrons with d orbital of silicon is weaker than that of Cl lone pair electron

4. All of the above

Boric acid is an acid because its molecule

1.  Contains replaceable H⁺ ion

2.  Gives up a proton

3.  Accepts OH^- from water releasing proton into the solution

4.  Combines with proton from water molecules

Correct statement among the following is -

1. Sn²⁺ is oxidising agent while Pb⁴⁺ is reducing agent.

2. Sn²⁺ and Pb²⁺ both are oxidising agent.

3. Sn⁴⁺ is reducing agent while Pb⁴⁺ is oxidising agent.

4. Sn²⁺ is reducing agent  while Pb⁴⁺ is oxidising agent.

The correct order of atomic radii in group 13 elements is:

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

1.  Sheet silicate

2.  Pyrosilicate

3.  Three dimensional silicate

4.  Linear chain silicate

Al₂O₃ can be converted to anhydrous AlCl₃ by heating :

1. $A{l}_2{O}_3 with HCl gas$

2. $A{l}_2{O}_3$with NaCl in solid state

3. a mixture of $A{l}_2{O}_3$ and carbon in dry $C{l}_2$ gas

4. $A{l}_2{O}_3$ with $C{l}_2$ gas