The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence

• Ga<In< Al<Tl

• Al<Ga<In<Tl

• Tl<In<Ga<Al

• Tl<In<Ga<Al

The variation of the boiling point of the hydrogen halides in the order HF >  HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?

• The electronegativity of fluorine is much higher than for other elements in the group

• There is strong hydrogen bonding between HF molecules

• The bond energy of HF molecules is greater than in other hydrogens halides

• The bond energy of HF molecules is greater than in other hydrogens halides

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

570.

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