The p-Block Elements

Which of the following oxide is amphoteric?

• SnO₂

• CaO₂

• SiO₂

• SiO₂

Strong reducing behaviour of H₃PO₄ is due to

• the presence of one -OH group and two P-H bonds

• high electron gain enthalpy of phosphorous 

• the high oxidation state of phosphorus

• the high oxidation state of phosphorus

Oxidation states of P in H₄P₂O_5, H₄P₂O₆, H₄P₂O₇, are respectively

• +3, +5, +4

• +5, +3, +4

• +5, +4,+3

• +5, +4,+3

The correct order of increasing bond angles in 

• Cl₂O < ClO₂ < ClO₂^-

• ClO₂ <Cl₂O< ClO₂^-

• Cl₂O < ClO₂^- < ClO₂

• Cl₂O < ClO₂^- < ClO₂

Match (I) substances with List (II) processes employed in the manufacture of the substances and select the correct option.

• A	B	C	D
  1	4	2	3

• A	B	C	D
  1	2	3	4

• A	B	C	D
  4	3	2	1

• A	B	C	D
  4	3	2	1

which of the following oxides is not expected to react with sodium hydroxide?

• B₂O₃

• CaO

• SiO₂

• SiO₂

Among the following which is the strongest oxidising agent?

• F₂

• Br₂

• I₂

• I₂

The stability of +1 oxidation state increases in the sequence 

• Al < Ga <In < Tl

• Tl < In <Ga< Al

• In < Tl < Ga < Al

• In < Tl < Ga < Al

Which one of the following arrangement does not give the correct picture of the trends indicated against it?

• F₂ > Cl₂ > Br₂ > I₂ : Oxidising power

• F₂ > Cl₂ > Br₂ > I₂ : Electron gain enthalpy

• F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy

• F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy

Which one of the following ionic species has the greatest proton affinity to form stable compound? 

• HS^-

• NH₂^-

• F^-

• F^-