P block elements

Choose the correct answer

• A-2,B-4,C-3,D-1

• A-2,B-1,C-3,D-4

• A-3,B-1,C-4,D-2

• A-3, B-1,C-2,D-4

Identify A,B,X,Y

• X=[O],Y=NO,A=O₂,B=O₃

• X=N₂O,Y=[O],A=O₃,B=NO

• X=½O₂,Y=NO₂,A=O₃,B=O₂

• X=NO,Y=[O],A=O₂,B=N₂O₃

Choose the correct statements about the hydrides of group 15 elements.

A. The stability of the hydrides decreases in the order NH, PH > AsH > SbH > Він

B. The reducing ability of the hydrides increases in the order NH, PH₁ < AsH₁ < SbH < BiH,

C. Among the hydrides, NH, is strong reducing agent while BiH, is mild reducing agent.

D. The basicity of the hydrides increases in the order NH, PH, <ASH, <SbH, < BiH,

Choose the most appropriate from the option given below:

• B and C only

• C and D only

• A and B only

• A and D only

Number of electron deficient molecules among the following PH₃, B₂H₆, CCI₄, NH₃, LiH and BCl₃, is

• 0

• 1

• 2

• 3

The most stable trihalide of nitrogen is

• NF₃

• NCl₃

• NBr₃

• NI₃

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Melting point of Boron (2453 K) is unusually high in group 13 elements.

Reason (R): Solid Boron has very strong crystalline lattice.

In the light of the above statements, choose the most appropriate answer from the options given below;

• Both A and R are correct but R is not the correct explanation of A

• Both A and R are correct and R is the correct explanation of A

• A is true but R is false

• A is false but R is true

PCl₅ is well known but NCl₅ is not.because,

• Nitrogen is less reactive than phosphorus

• Nitrogen doesn't have d-orbital in its valance shell

• Catenation tendency is weaker in Nitrogen than phosphorus

• Size of phosphorus is larger than Nitrogen

A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is

• Sb

• P

• As

• Bi

If the formula of borax is Na₂B₄O_x(OH)_y.zH₂O,then x+y+z is

• 15

• 14

• 16

• 17

Correct statements among 'A' to 'D' regarding silicones are:

(A) They are polymers with hydrophobic character.

(B) They are biocompatible.

(C) In general, they have high thermal stability and low dielectric strength.

(D) Usually, they are resistant to oxidation and used as greases.

• A,B,C and D

• A,B and C only

• A and B only

• A,B and D only