Boron and its Compounds
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CHXI11:THE P-BLOCK ELEMENTS

316037 Among the following, the one that does not exist in the free form is

1 \({\text{B}}{{\text{F}}_{\text{3}}}\)
2 \(\mathrm{BCl}_{3}\)
3 \(\mathrm{BBr}_{3}\)
4 \(\mathrm{BH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316038 A gas other than \(\mathrm{HCl}\) is obtained in

1 \(\mathrm{BCl}_{3}+\mathrm{H}_{2} \xrightarrow[\text { discharge }]{\text { Silentelric }}\)
2 \(\mathrm{LiAlH}_{4}+\mathrm{BF}_{3} \rightarrow\)
3 Both (1) & (2)
4 None of these
CHXI11:THE P-BLOCK ELEMENTS

316039 A compound \(\mathrm{X}\), of boron reacts with \(\mathrm{NH}_{3}\) on heating to give another compound \(\mathrm{Y}\) which is called inorganic benzene. The compound \(\mathrm{X}\) can be prepared by treating \({\text{B}}{{\text{F}}_{\text{3}}}\) with Lithium aluminium hydride. The compounds \(\mathrm{X}\) and \(\mathrm{Y}\) are represented by the formulas.

1 \({{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
2 \(\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
3 \(\mathrm{BF}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
4 \({{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)
NCERT Exemplar
CHXI11:THE P-BLOCK ELEMENTS

316040 Which one of the following is the correct statement?

1 \(\mathrm{B}_{2} \mathrm{H}_{6} \cdot 2 \mathrm{NH}_{3}\) is known as 'inorganic benzene'
2 Boric acid is a protonic acid
3 Beryllium exhibits coordination number of six
4 Chlorides of both beryllium and aluminium have bridged chlorine structures in solid phase
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CHXI11:THE P-BLOCK ELEMENTS

316037 Among the following, the one that does not exist in the free form is

1 \({\text{B}}{{\text{F}}_{\text{3}}}\)
2 \(\mathrm{BCl}_{3}\)
3 \(\mathrm{BBr}_{3}\)
4 \(\mathrm{BH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316038 A gas other than \(\mathrm{HCl}\) is obtained in

1 \(\mathrm{BCl}_{3}+\mathrm{H}_{2} \xrightarrow[\text { discharge }]{\text { Silentelric }}\)
2 \(\mathrm{LiAlH}_{4}+\mathrm{BF}_{3} \rightarrow\)
3 Both (1) & (2)
4 None of these
CHXI11:THE P-BLOCK ELEMENTS

316039 A compound \(\mathrm{X}\), of boron reacts with \(\mathrm{NH}_{3}\) on heating to give another compound \(\mathrm{Y}\) which is called inorganic benzene. The compound \(\mathrm{X}\) can be prepared by treating \({\text{B}}{{\text{F}}_{\text{3}}}\) with Lithium aluminium hydride. The compounds \(\mathrm{X}\) and \(\mathrm{Y}\) are represented by the formulas.

1 \({{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
2 \(\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
3 \(\mathrm{BF}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
4 \({{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)
NCERT Exemplar
CHXI11:THE P-BLOCK ELEMENTS

316040 Which one of the following is the correct statement?

1 \(\mathrm{B}_{2} \mathrm{H}_{6} \cdot 2 \mathrm{NH}_{3}\) is known as 'inorganic benzene'
2 Boric acid is a protonic acid
3 Beryllium exhibits coordination number of six
4 Chlorides of both beryllium and aluminium have bridged chlorine structures in solid phase
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CHXI11:THE P-BLOCK ELEMENTS

316037 Among the following, the one that does not exist in the free form is

1 \({\text{B}}{{\text{F}}_{\text{3}}}\)
2 \(\mathrm{BCl}_{3}\)
3 \(\mathrm{BBr}_{3}\)
4 \(\mathrm{BH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316038 A gas other than \(\mathrm{HCl}\) is obtained in

1 \(\mathrm{BCl}_{3}+\mathrm{H}_{2} \xrightarrow[\text { discharge }]{\text { Silentelric }}\)
2 \(\mathrm{LiAlH}_{4}+\mathrm{BF}_{3} \rightarrow\)
3 Both (1) & (2)
4 None of these
CHXI11:THE P-BLOCK ELEMENTS

316039 A compound \(\mathrm{X}\), of boron reacts with \(\mathrm{NH}_{3}\) on heating to give another compound \(\mathrm{Y}\) which is called inorganic benzene. The compound \(\mathrm{X}\) can be prepared by treating \({\text{B}}{{\text{F}}_{\text{3}}}\) with Lithium aluminium hydride. The compounds \(\mathrm{X}\) and \(\mathrm{Y}\) are represented by the formulas.

1 \({{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
2 \(\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
3 \(\mathrm{BF}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
4 \({{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)
NCERT Exemplar
CHXI11:THE P-BLOCK ELEMENTS

316040 Which one of the following is the correct statement?

1 \(\mathrm{B}_{2} \mathrm{H}_{6} \cdot 2 \mathrm{NH}_{3}\) is known as 'inorganic benzene'
2 Boric acid is a protonic acid
3 Beryllium exhibits coordination number of six
4 Chlorides of both beryllium and aluminium have bridged chlorine structures in solid phase
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CHXI11:THE P-BLOCK ELEMENTS

316037 Among the following, the one that does not exist in the free form is

1 \({\text{B}}{{\text{F}}_{\text{3}}}\)
2 \(\mathrm{BCl}_{3}\)
3 \(\mathrm{BBr}_{3}\)
4 \(\mathrm{BH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316038 A gas other than \(\mathrm{HCl}\) is obtained in

1 \(\mathrm{BCl}_{3}+\mathrm{H}_{2} \xrightarrow[\text { discharge }]{\text { Silentelric }}\)
2 \(\mathrm{LiAlH}_{4}+\mathrm{BF}_{3} \rightarrow\)
3 Both (1) & (2)
4 None of these
CHXI11:THE P-BLOCK ELEMENTS

316039 A compound \(\mathrm{X}\), of boron reacts with \(\mathrm{NH}_{3}\) on heating to give another compound \(\mathrm{Y}\) which is called inorganic benzene. The compound \(\mathrm{X}\) can be prepared by treating \({\text{B}}{{\text{F}}_{\text{3}}}\) with Lithium aluminium hydride. The compounds \(\mathrm{X}\) and \(\mathrm{Y}\) are represented by the formulas.

1 \({{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
2 \(\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
3 \(\mathrm{BF}_{3}, \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}\)
4 \({{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}{\text{,}}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)
NCERT Exemplar
CHXI11:THE P-BLOCK ELEMENTS

316040 Which one of the following is the correct statement?

1 \(\mathrm{B}_{2} \mathrm{H}_{6} \cdot 2 \mathrm{NH}_{3}\) is known as 'inorganic benzene'
2 Boric acid is a protonic acid
3 Beryllium exhibits coordination number of six
4 Chlorides of both beryllium and aluminium have bridged chlorine structures in solid phase
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