The P Block Elements CBSE Questions & Answers

The P Block Elements

This is Chemistry Class 11 The p Block Elements CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

A
\({\text{HOCl}}{{\text{O}}_{\text{2}}} < {\text{ HOCl}}{{\text{O}}_{\text{3}}} < {\text{ HOClO }} < {\text{ HOCl}}\)
B
\({\text{HOCl }} < {\text{ HOClO }} < {\text{ HOCl}}{{\text{O}}_{\text{2}}} < {\text{ HOCl}}{{\text{O}}_{\text{3}}}\)
Correct
C
\({\text{HOCl}}{{\text{O}}_{\text{3}}} < {\text{ HOCl}}{{\text{O}}_{\text{2}}} < {\text{ HOClO }} < {\text{ HOCl}}\)
D
\({\text{HOClO }} < {\text{ HOCl }} < {\text{ HOCl}}{{\text{O}}_{\text{3}}} < {\text{ HOCl}}{{\text{O}}_{\text{2}}}\)

Regular use of which of the following fertilizers increases the acidity of the soil?

A
Urea
B
Superphosphate of lime
C
Ammonium sulphate
Correct
D
Potassium nitrate

The percentage of p-character in the orbitals forming P - P bonds in \({{\text{P}}_{\text{4}}}\) is

A
33
B
25
C
50
D
75.0
Correct

When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

A
Zero to – 1 and zero to +5
Correct
B
Zero to + 1 and zero to –3
C
Zero to + 1 and zero to –5
D
Zero to – 1 and zero to +3

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

A
\({{\text{N}}_{\text{2}}}{{\text{H}}_{\text{4}}}\)
B
\({\text{N}}{{\text{H}}_{\text{3}}}\)
C
\({{\text{N}}_{\text{3}}}{\text{H}}\)
Correct
D
\({\text{N}}{{\text{H}}_{\text{2}}}{\text{OH}}\)

Three reactions involving \({{\text{H}}_{\text{2}}}{\text{P}}\)\(o_4^ - \) are given below A. \({{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}} + {\text{ }}{{\text{H}}_{\text{2}}}{\text{O }} \to {\text{ }}{{\text{H}}_{\text{3}}}{{\text{O}}^ + } + {\text{ }}{{\text{H}}_{\text{2}}}{\text{P}}o_4^ - \)B. \({{\text{H}}_{\text{2}}}{\text{P}}o_4^ - + {\text{ }}{{\text{H}}_{\text{2}}}{\text{O }} \to {\text{ HP}}o_2^ + + {\text{ }}{{\text{H}}_{\text{3}}}{{\text{O}}^ + }\)C. \({{\text{H}}_{\text{2}}}{\text{P}}o_4^ - + O{H^ - }?H3PO4 + o_2^ - \)In which of the above does \({{\text{H}}_{\text{2}}}\)P\(o_4^ - \) act as an acid?

A
B. only
Correct
B
A. only
C
C. only
D
A. and B.

The correct order of increasing bond angles in the following species is

A
\({\text{C}}{{\text{l}}_{\text{2}}}{\text{O }} < {\text{ Cl}}{{\text{O}}_{\text{2}}} < {\text{ Cl}}o_2^ - \)
B
\({\text{C}}{{\text{l}}_{\text{2}}}{\text{O }} < {\text{ Cl}}o_2^ - < {\text{ Cl}}{{\text{O}}_{\text{2}}}\)
C
\({\text{Cl}}o_2^ - < {\text{ C}}{{\text{l}}_{\text{2}}}{\text{O }} < {\text{ Cl}}{{\text{O}}_{\text{2}}}\)
Correct
D
\({\text{Cl}}{{\text{O}}_{\text{2}}} < {\text{ C}}{{\text{l}}_{\text{2}}}{\text{O }} < {\text{ Cl}}o_2^ - \)

The tendency of \({\text{B}}{{\text{F}}_{\text{3}}},{\text{ BC}}{{\text{l}}_{\text{3}}}\) and \({\text{BB}}{{\text{r}}_{\text{3}}}\) to behave as Lewis acid decreases in the sequence:

A
\({\text{BC}}{{\text{l}}_{\text{3}}} > {\text{ B}}{{\text{F}}_{\text{3}}} > {\text{ BB}}{{\text{r}}_{\text{3}}}\)
B
\({\text{B}}{{\text{F}}_{\text{3}}} > {\text{ BC}}{{\text{l}}_{\text{3}}} > {\text{ BB}}{{\text{r}}_{\text{3}}}\)
C
\({\text{BB}}{{\text{R}}_{\text{3}}} > {\text{ BC}}{{\text{l}}_{\text{3}}} > {\text{ B}}{{\text{F}}_{\text{3}}}\)
Correct
D
\({\text{BB}}{{\text{r}}_{\text{3}}} > {\text{ B}}{{\text{F}}_{\text{3}}} > {\text{ BC}}{{\text{l}}_{\text{3}}}\)

\({{\text{P}}_{\text{4}}}{{\text{O}}_{{\text{1}}0}}\)is the anhydride of

A
\({{\text{H}}_{\text{4}}}{{\text{P}}_{\text{2}}}{{\text{O}}_{\text{7}}}\)
B
\({{\text{H}}_{\text{3}}}{\text{PO}}\) 2
C
\({{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{3}}}\)
D
\({{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}\)
Correct

Which of the following statements regarding ozone is not correct?

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

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

A
Orthophosphoric acid
B
Phosphorous acid
C
Pyrophosphoric acid
Correct
D
Hypophosphorous acid

Which noble gas is most abundant in atmosphere?

A
Ne
B
He
C
Ar
Correct
D
Kr

The reaction of \({{\text{P}}_{\text{4}}}\) with X leads selectively to \({{\text{P}}_{\text{4}}}{{\text{O}}_{\text{6}}}\). The X is

A
Moist \({{\text{O}}_{\text{2}}}\)
B
A mixture of \({{\text{O}}_{\text{2}}}\) and \({{\text{N}}_{\text{2}}}\)
Correct
C
Dry \({{\text{O}}_{\text{2}}}\)
D
\({{\text{O}}_{\text{2}}}\) in the presence of aqueous NaOH

Which of the following reactions of xenon compounds is not feasible?

A
\({\text{Xe}}{{\text{F}}_{\text{6}}} + {\text{ RbF }}{\text{ Rb }}\left[ {{\text{Xe}}{{\text{F}}_{\text{7}}}} \right]\)
B
\({\text{2Xe}}{{\text{F}}_{\text{2}}} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O }}{\text{ 2Xe }} + {\text{ 4HF }} + {\text{ }}{{\text{O}}_{\text{2}}}\)
C
\({\text{3Xe}}{{\text{F}}_{\text{4}}} + {\text{ 6}}{{\text{H}}_{\text{2}}}{\text{O }}{\text{ 2Xe }} + {\text{ Xe}}{{\text{O}}_{\text{3}}} + {\text{ 12HF }} + {\text{ 1}}.{\text{5}}{{\text{O}}_{\text{2}}}\)
D
\({\text{Xe}}{{\text{O}}_{\text{3}}} + {\text{ 6HF }}{\text{ Xe}}{{\text{F}}_{\text{6}}} + {\text{ 3}}{{\text{H}}_{\text{2}}}{\text{O}}\)
Correct

In which of the following arrangements, the sequence is not strictly according to the property written against it?

A
\({\text{r N}}{{\text{H}}_{\text{3}}} < {\text{ P}}{{\text{H}}_{\text{3}}} < {\text{ As}}{{\text{H}}_{\text{3}}} < {\text{ Sb}}{{\text{H}}_{\text{3}}}\): Increasing basic strength
Correct
B
\({\text{B }} < {\text{ C }} < {\text{ O }} < {\text{ N}}\): Increasing first ionization enthalpy
C
\({\text{HF }} < {\text{ HCl }} < {\text{ HBr }} < {\text{ HI }}:\)Increasing acid strength
D
\({\text{C}}{{\text{O}}_{\text{2}}} < {\text{ Si}}{{\text{O}}_{\text{2}}} < {\text{ Sn}}{{\text{O}}_{\text{2}}} < {\text{ Pb}}{{\text{O}}_{\text{2}}}\): Increasing oxidizing power