p - Block Elements XI

p-Block Elements
Class:XI / Unit:11

1. The reaction of P₄ with X leads selectively to P₄O₆. The X is

O₂ in the presence of aqueous NaOH
A mixture of O₂ and N₂
Dry O₂
Moist O₂

2. Which of the following contains P - O - P bond?

Hypophosphorous acid
Phosphorous acid
Orthophosphoric acid
Pyrophosphoric acid

3. Which of the following statements regarding ozone is not correct?

The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen
The ozone is response hybrid of two structures
Ozone is used as a germicide and disinfectant for the purification of air
The ozone molecule is angular in shape

4. P₄O₁₀ is the anhydride of

H₃PO₃
H₃PO₂
H₄P₂O₇
H₃PO₄

5. In which of the following compounds, nitrogen exhibits highest oxidation state?

NH₂OH
NH₃
N₃H
N₂H₄

6. Which of the species has a permanent dipole moment?

SiF₄
SF₄
XeF₄
BF₃

7. Which is the correct order of decreasing bond dissociation enthalpy?

Cl₂ > Br₂ > F₂ > I₂
I₂ > Br₂ > Cl₂ > F₂
F₂ > Cl₂ > Br₂ > I₂
Br₂ > I₂ > F₂ > Cl₂

8. Which is the correct order of decreasing acidity of lewis acids?

BF₃ > BCl₃ > BBr₃
BCl₃ > BF₃ > BBr₃
BBr₃ > BCl₃ > BF₃
BBr₃ > BF₃ > BCl₃

9. Graphite has a structural similarity with

BN
B₄C
B
B₂H₆

10. Which of the following is the amphoteric oxide

CO₂
CaO₂
SnO₂
SiO₂