Boron and its Compounds
CHXI11:THE P-BLOCK ELEMENTS

316035 \(\mathrm{BCl}_{3}\) does not exists as dimer but \(\mathrm{BH}_{3}\) exists as dimer \(\left( {{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}} \right)\) because

1 Chlorine is more electronegative than hydrogen
2 There is \(p \pi-p \pi\) back bonding in \(\mathrm{BCl}_{3}\) but \(\mathrm{BH}_{3}\) does not contain such multiple bonding
3 Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms
4 None of the above
CHXI11:THE P-BLOCK ELEMENTS

316056 Borax glass is a mixture of

1 \(\mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}\)
2 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
3 \(\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
4 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}+\mathrm{B}_{2} \mathrm{O}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316057 How much nitrogen is evolved when one gram of ammonium chloride is heated with borax strongly?

1 2
2 4
3 0
4 5
CHXI11:THE P-BLOCK ELEMENTS

316058 Borax on heating with cobalt oxide forms a blue bead of

1 \(\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}\)
2 \(\mathrm{CoBO}_{2}\)
3 \(\mathrm{Co}_{3}\left(\mathrm{BO}_{3}\right)_{2}\)
4 \(\mathrm{Na}_{3} \mathrm{Co}\left(\mathrm{BO}_{3}\right)_{2}\)
CHXI11:THE P-BLOCK ELEMENTS

316036 Complete the following chemical equations by identifying
\({\text{X}},{\text{Y}}\) and \({\text{Z}}\), respectively.
\({\rm{X + 3LiAl}}{{\rm{H}}_{\rm{4}}} \to {\rm{Y + 3LiF + 3Al}}{{\rm{F}}_{\rm{3}}}\)
\({\rm{Y}} + 6{{\rm{H}}_2}{\rm{O}} \to {\rm{Z}} + 6{{\rm{H}}_2}\)
\(3{\rm{Y}} + 3{{\rm{O}}_2}{{\rm{B}}_2}{{\rm{O}}_3} + 3{{\rm{H}}_2}{\rm{O}}\)

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

316035 \(\mathrm{BCl}_{3}\) does not exists as dimer but \(\mathrm{BH}_{3}\) exists as dimer \(\left( {{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}} \right)\) because

1 Chlorine is more electronegative than hydrogen
2 There is \(p \pi-p \pi\) back bonding in \(\mathrm{BCl}_{3}\) but \(\mathrm{BH}_{3}\) does not contain such multiple bonding
3 Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms
4 None of the above
CHXI11:THE P-BLOCK ELEMENTS

316056 Borax glass is a mixture of

1 \(\mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}\)
2 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
3 \(\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
4 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}+\mathrm{B}_{2} \mathrm{O}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316057 How much nitrogen is evolved when one gram of ammonium chloride is heated with borax strongly?

1 2
2 4
3 0
4 5
CHXI11:THE P-BLOCK ELEMENTS

316058 Borax on heating with cobalt oxide forms a blue bead of

1 \(\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}\)
2 \(\mathrm{CoBO}_{2}\)
3 \(\mathrm{Co}_{3}\left(\mathrm{BO}_{3}\right)_{2}\)
4 \(\mathrm{Na}_{3} \mathrm{Co}\left(\mathrm{BO}_{3}\right)_{2}\)
CHXI11:THE P-BLOCK ELEMENTS

316036 Complete the following chemical equations by identifying
\({\text{X}},{\text{Y}}\) and \({\text{Z}}\), respectively.
\({\rm{X + 3LiAl}}{{\rm{H}}_{\rm{4}}} \to {\rm{Y + 3LiF + 3Al}}{{\rm{F}}_{\rm{3}}}\)
\({\rm{Y}} + 6{{\rm{H}}_2}{\rm{O}} \to {\rm{Z}} + 6{{\rm{H}}_2}\)
\(3{\rm{Y}} + 3{{\rm{O}}_2}{{\rm{B}}_2}{{\rm{O}}_3} + 3{{\rm{H}}_2}{\rm{O}}\)

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

316035 \(\mathrm{BCl}_{3}\) does not exists as dimer but \(\mathrm{BH}_{3}\) exists as dimer \(\left( {{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}} \right)\) because

1 Chlorine is more electronegative than hydrogen
2 There is \(p \pi-p \pi\) back bonding in \(\mathrm{BCl}_{3}\) but \(\mathrm{BH}_{3}\) does not contain such multiple bonding
3 Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms
4 None of the above
CHXI11:THE P-BLOCK ELEMENTS

316056 Borax glass is a mixture of

1 \(\mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}\)
2 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
3 \(\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
4 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}+\mathrm{B}_{2} \mathrm{O}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316057 How much nitrogen is evolved when one gram of ammonium chloride is heated with borax strongly?

1 2
2 4
3 0
4 5
CHXI11:THE P-BLOCK ELEMENTS

316058 Borax on heating with cobalt oxide forms a blue bead of

1 \(\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}\)
2 \(\mathrm{CoBO}_{2}\)
3 \(\mathrm{Co}_{3}\left(\mathrm{BO}_{3}\right)_{2}\)
4 \(\mathrm{Na}_{3} \mathrm{Co}\left(\mathrm{BO}_{3}\right)_{2}\)
CHXI11:THE P-BLOCK ELEMENTS

316036 Complete the following chemical equations by identifying
\({\text{X}},{\text{Y}}\) and \({\text{Z}}\), respectively.
\({\rm{X + 3LiAl}}{{\rm{H}}_{\rm{4}}} \to {\rm{Y + 3LiF + 3Al}}{{\rm{F}}_{\rm{3}}}\)
\({\rm{Y}} + 6{{\rm{H}}_2}{\rm{O}} \to {\rm{Z}} + 6{{\rm{H}}_2}\)
\(3{\rm{Y}} + 3{{\rm{O}}_2}{{\rm{B}}_2}{{\rm{O}}_3} + 3{{\rm{H}}_2}{\rm{O}}\)

1 \(\mathrm{BF}_{3}, \mathrm{~B}_{2} \mathrm{H}_{6}, \mathrm{H}_{3} \mathrm{BO}_{3}\)
2 \(\mathrm{H}_{3} \mathrm{BO}_{3}, \mathrm{BF}_{3}, \mathrm{~B}_{2} \mathrm{H}_{6}\)
3 \(\mathrm{B}_{2} \mathrm{H}_{6}, \mathrm{H}_{3} \mathrm{BO}_{3}, \mathrm{BF}_{3}\)
4 \(\mathrm{BF}_{3}, \mathrm{H}_{3} \mathrm{BO}_{3}, \mathrm{~B}_{2} \mathrm{H}_{6}\)
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
CHXI11:THE P-BLOCK ELEMENTS

316035 \(\mathrm{BCl}_{3}\) does not exists as dimer but \(\mathrm{BH}_{3}\) exists as dimer \(\left( {{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}} \right)\) because

1 Chlorine is more electronegative than hydrogen
2 There is \(p \pi-p \pi\) back bonding in \(\mathrm{BCl}_{3}\) but \(\mathrm{BH}_{3}\) does not contain such multiple bonding
3 Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms
4 None of the above
CHXI11:THE P-BLOCK ELEMENTS

316056 Borax glass is a mixture of

1 \(\mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}\)
2 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
3 \(\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
4 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}+\mathrm{B}_{2} \mathrm{O}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316057 How much nitrogen is evolved when one gram of ammonium chloride is heated with borax strongly?

1 2
2 4
3 0
4 5
CHXI11:THE P-BLOCK ELEMENTS

316058 Borax on heating with cobalt oxide forms a blue bead of

1 \(\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}\)
2 \(\mathrm{CoBO}_{2}\)
3 \(\mathrm{Co}_{3}\left(\mathrm{BO}_{3}\right)_{2}\)
4 \(\mathrm{Na}_{3} \mathrm{Co}\left(\mathrm{BO}_{3}\right)_{2}\)
CHXI11:THE P-BLOCK ELEMENTS

316036 Complete the following chemical equations by identifying
\({\text{X}},{\text{Y}}\) and \({\text{Z}}\), respectively.
\({\rm{X + 3LiAl}}{{\rm{H}}_{\rm{4}}} \to {\rm{Y + 3LiF + 3Al}}{{\rm{F}}_{\rm{3}}}\)
\({\rm{Y}} + 6{{\rm{H}}_2}{\rm{O}} \to {\rm{Z}} + 6{{\rm{H}}_2}\)
\(3{\rm{Y}} + 3{{\rm{O}}_2}{{\rm{B}}_2}{{\rm{O}}_3} + 3{{\rm{H}}_2}{\rm{O}}\)

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

316035 \(\mathrm{BCl}_{3}\) does not exists as dimer but \(\mathrm{BH}_{3}\) exists as dimer \(\left( {{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}} \right)\) because

1 Chlorine is more electronegative than hydrogen
2 There is \(p \pi-p \pi\) back bonding in \(\mathrm{BCl}_{3}\) but \(\mathrm{BH}_{3}\) does not contain such multiple bonding
3 Large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted in between boron atoms
4 None of the above
CHXI11:THE P-BLOCK ELEMENTS

316056 Borax glass is a mixture of

1 \(\mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}\)
2 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
3 \(\mathrm{H}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{B}_{2} \mathrm{O}_{3}\)
4 \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}+\mathrm{B}_{2} \mathrm{O}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS

316057 How much nitrogen is evolved when one gram of ammonium chloride is heated with borax strongly?

1 2
2 4
3 0
4 5
CHXI11:THE P-BLOCK ELEMENTS

316058 Borax on heating with cobalt oxide forms a blue bead of

1 \(\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}\)
2 \(\mathrm{CoBO}_{2}\)
3 \(\mathrm{Co}_{3}\left(\mathrm{BO}_{3}\right)_{2}\)
4 \(\mathrm{Na}_{3} \mathrm{Co}\left(\mathrm{BO}_{3}\right)_{2}\)
CHXI11:THE P-BLOCK ELEMENTS

316036 Complete the following chemical equations by identifying
\({\text{X}},{\text{Y}}\) and \({\text{Z}}\), respectively.
\({\rm{X + 3LiAl}}{{\rm{H}}_{\rm{4}}} \to {\rm{Y + 3LiF + 3Al}}{{\rm{F}}_{\rm{3}}}\)
\({\rm{Y}} + 6{{\rm{H}}_2}{\rm{O}} \to {\rm{Z}} + 6{{\rm{H}}_2}\)
\(3{\rm{Y}} + 3{{\rm{O}}_2}{{\rm{B}}_2}{{\rm{O}}_3} + 3{{\rm{H}}_2}{\rm{O}}\)

1 \(\mathrm{BF}_{3}, \mathrm{~B}_{2} \mathrm{H}_{6}, \mathrm{H}_{3} \mathrm{BO}_{3}\)
2 \(\mathrm{H}_{3} \mathrm{BO}_{3}, \mathrm{BF}_{3}, \mathrm{~B}_{2} \mathrm{H}_{6}\)
3 \(\mathrm{B}_{2} \mathrm{H}_{6}, \mathrm{H}_{3} \mathrm{BO}_{3}, \mathrm{BF}_{3}\)
4 \(\mathrm{BF}_{3}, \mathrm{H}_{3} \mathrm{BO}_{3}, \mathrm{~B}_{2} \mathrm{H}_{6}\)