The p-Block Elements

Maximum deviation from ideal gas expected from

• H₂ (g)

• N₂ (g)

• CH₄ (g)

• CH₄ (g)

Which is the strongest acid in the following?

• H₂SO₄

• HClO₃

• HClO₄

• HClO₄

Identify the correct order of solubility in aqueous medium

• CuS> ZnS> Na₂S

• ZnS > Na₂S> CuS

• Na₂S> CuS> ZnS

• Na₂S> CuS> ZnS

XeF₂ is isostructural with 

• TeF₂

• ICl^-₂

• SbCl₃

• SbCl₃

Which one of the following molecules contains no pi -bond?

• CO₂

• H₂O

• SO₂

• SO₂

Which of the following is a polar molecule?

• BF₃

• SF₄

• SiF₄

• SiF₄

Which of the following statements is not valid for oxoacids of phosphorus? 

• Orthophosphoric acid is used in the manufacture of triple superphosphate

• Hypophosphorous acid is a diprotic acid

• All oxoacids contain tetrahedral four coordinated phosphorus

• All oxoacids contain tetrahedral four coordinated phosphorus

In Which of the following arrangement, the given sequence is not strictly according to the property indicated against it ? 

• HF < HCl< HBr < HI : increasing acidic strength

• H₂O < H₂S < H₂Se < H₂Te : increasing pK_a values.

• NH₃ < PH₃ < AsH₃ < SbH₃  : increasing acidic character

• NH₃ < PH₃ < AsH₃ < SbH₃  : increasing acidic character

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