p-Block Elements

NEET Chemistry · 114 questions · Page 12 of 12 · Click an option or "Show Solution" to reveal answer

Q111

Which one of the following statements is not true?

A Among halide ions, iodide is the most powerful reducing agent.

B Fluorine is the only halogen that does not show a variable oxidation state.

C HOCl is a stronger acid than HOBr.

D HF is a stronger acid than HCl.

Correct Answer

Option D

Solution

F is more electronegative than Cl therefore HF bond is stronger than HCl and hence proton is not given off easily and hence HF is a weakest acid.

Q112

Which one of the following compounds is not a protonic acid?

A B(OH) 3

B PO(OH) 3

C SO(OH) 2

D SO 2 (OH) 2

Correct Answer

Option A

Solution

B(OH) 3 does not provide H + ions in water instead it accepts OH – ion and hence it is Lewis acid.

B(OH) 3 + H 2 O ⇌ [B(OH) 4 ] - + H +

Q113

Which of the following statement is true?

A Silicon exhibits 4 coordination number in its compound.

B Bond energy of F 2 is less than Cl 2 .

C Mn(III) oxidation state is more stable than Mn(II) in aqueous state.

D Elements of 15 th group shows only + 3 and +5 oxidation states.

Correct Answer

Option B

Solution

Fluorine is more reactive than chlorine.

So, bond energy of chlorine is greater than fluorine.

Silicon exhibits 6 coordination numbers.

In aqueous state Mn(II) is more stable.

Mn ⇌ Mn 2+ + 2e -

Q114

Which compound is electron deficient?

A BeCl 2

B BCl 3

C CCl 4

D PCl 5

Correct Answer

Option B

Solution

In BCl 3 the central atom ‘B’ is sp 2 hybridised and contains only ‘six’ electrons in its valence shell.

Therefore it is electron deficient.

Ready for a full NEET mock test? Timed · full syllabus · instant results

Take a Mock Test →