Boron and its Compounds
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NEET DIGITAL LIBRARY
CHXI11:THE P-BLOCK ELEMENTS

316054 Borax \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\) is actually:

1 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{2} \mathrm{O}_{4}(\mathrm{OH})_{6}\right] \cdot 7 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{3}(\mathrm{OH})_{8}\right] \cdot 6 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{2}(\mathrm{OH})_{10}\right] .5 \mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316055 Correct match is

1 Ordinary form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
2 Colemanite: \(\mathrm{Ca}_{2} \mathrm{~B}_{6} \mathrm{O}_{11} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 Boronatrocalcite: \(2 \mathrm{MgB}_{8} \mathrm{O}_{15} \cdot \mathrm{MgCl}_{2}\)
4 Octahedral form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10\) \(\mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316059 Read the Statement A and Statement B carefully and mark correct option.
Statement A :
Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement B :
The green colour observed is due to the formation of copper (I) metaborate.

1 Both Statement A and Statement B are false.
2 Both Statement A and Statement B are true.
3 Statement A is false but Statement B is true.
4 Statement A is true but Statement B is false.
JEE - 2023
CHXI11:THE P-BLOCK ELEMENTS

316060 Pick the reaction which is not a part of borax bead test for copper in copper sulphate.

1 \({\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{.10}}{{\text{H}}_{\text{2}}}{\text{O}}\xrightarrow[{{\text{heat}}}]{}{\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ + }}{{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7}\xrightarrow[{{\text{heating}}}]{{{\text{strong}}}}2{\text{NaB}}{{\text{O}}_2} + {{\text{B}}_2}{{\text{O}}_3}\)
3 \(\mathrm{CuSO}_{4}+2 \mathrm{NaBO}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2} \cdot \mathrm{SO}_{4}\)
4 \(\mathrm{CuSO}_{4}+\mathrm{B}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}+\mathrm{SO}_{3}\)
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CHXI11:THE P-BLOCK ELEMENTS

316054 Borax \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\) is actually:

1 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{2} \mathrm{O}_{4}(\mathrm{OH})_{6}\right] \cdot 7 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{3}(\mathrm{OH})_{8}\right] \cdot 6 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{2}(\mathrm{OH})_{10}\right] .5 \mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316055 Correct match is

1 Ordinary form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
2 Colemanite: \(\mathrm{Ca}_{2} \mathrm{~B}_{6} \mathrm{O}_{11} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 Boronatrocalcite: \(2 \mathrm{MgB}_{8} \mathrm{O}_{15} \cdot \mathrm{MgCl}_{2}\)
4 Octahedral form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10\) \(\mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316059 Read the Statement A and Statement B carefully and mark correct option.
Statement A :
Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement B :
The green colour observed is due to the formation of copper (I) metaborate.

1 Both Statement A and Statement B are false.
2 Both Statement A and Statement B are true.
3 Statement A is false but Statement B is true.
4 Statement A is true but Statement B is false.
JEE - 2023
CHXI11:THE P-BLOCK ELEMENTS

316060 Pick the reaction which is not a part of borax bead test for copper in copper sulphate.

1 \({\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{.10}}{{\text{H}}_{\text{2}}}{\text{O}}\xrightarrow[{{\text{heat}}}]{}{\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ + }}{{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7}\xrightarrow[{{\text{heating}}}]{{{\text{strong}}}}2{\text{NaB}}{{\text{O}}_2} + {{\text{B}}_2}{{\text{O}}_3}\)
3 \(\mathrm{CuSO}_{4}+2 \mathrm{NaBO}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2} \cdot \mathrm{SO}_{4}\)
4 \(\mathrm{CuSO}_{4}+\mathrm{B}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}+\mathrm{SO}_{3}\)
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CHXI11:THE P-BLOCK ELEMENTS

316054 Borax \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\) is actually:

1 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{2} \mathrm{O}_{4}(\mathrm{OH})_{6}\right] \cdot 7 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{3}(\mathrm{OH})_{8}\right] \cdot 6 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{2}(\mathrm{OH})_{10}\right] .5 \mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316055 Correct match is

1 Ordinary form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
2 Colemanite: \(\mathrm{Ca}_{2} \mathrm{~B}_{6} \mathrm{O}_{11} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 Boronatrocalcite: \(2 \mathrm{MgB}_{8} \mathrm{O}_{15} \cdot \mathrm{MgCl}_{2}\)
4 Octahedral form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10\) \(\mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316059 Read the Statement A and Statement B carefully and mark correct option.
Statement A :
Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement B :
The green colour observed is due to the formation of copper (I) metaborate.

1 Both Statement A and Statement B are false.
2 Both Statement A and Statement B are true.
3 Statement A is false but Statement B is true.
4 Statement A is true but Statement B is false.
JEE - 2023
CHXI11:THE P-BLOCK ELEMENTS

316060 Pick the reaction which is not a part of borax bead test for copper in copper sulphate.

1 \({\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{.10}}{{\text{H}}_{\text{2}}}{\text{O}}\xrightarrow[{{\text{heat}}}]{}{\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ + }}{{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7}\xrightarrow[{{\text{heating}}}]{{{\text{strong}}}}2{\text{NaB}}{{\text{O}}_2} + {{\text{B}}_2}{{\text{O}}_3}\)
3 \(\mathrm{CuSO}_{4}+2 \mathrm{NaBO}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2} \cdot \mathrm{SO}_{4}\)
4 \(\mathrm{CuSO}_{4}+\mathrm{B}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}+\mathrm{SO}_{3}\)
NEET DIGITAL LIBRARY
CHXI11:THE P-BLOCK ELEMENTS

316054 Borax \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O}\) is actually:

1 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right] \cdot 8 \mathrm{H}_{2} \mathrm{O}\)
2 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{2} \mathrm{O}_{4}(\mathrm{OH})_{6}\right] \cdot 7 \mathrm{H}_{2} \mathrm{O}\)
3 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{3}(\mathrm{OH})_{8}\right] \cdot 6 \mathrm{H}_{2} \mathrm{O}\)
4 \(\mathrm{Na}_{2}\left[\mathrm{~B}_{4} \mathrm{O}_{2}(\mathrm{OH})_{10}\right] .5 \mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316055 Correct match is

1 Ordinary form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
2 Colemanite: \(\mathrm{Ca}_{2} \mathrm{~B}_{6} \mathrm{O}_{11} \cdot 5 \mathrm{H}_{2} \mathrm{O}\)
3 Boronatrocalcite: \(2 \mathrm{MgB}_{8} \mathrm{O}_{15} \cdot \mathrm{MgCl}_{2}\)
4 Octahedral form of borax: \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10\) \(\mathrm{H}_{2} \mathrm{O}\)
CHXI11:THE P-BLOCK ELEMENTS

316059 Read the Statement A and Statement B carefully and mark correct option.
Statement A :
Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement B :
The green colour observed is due to the formation of copper (I) metaborate.

1 Both Statement A and Statement B are false.
2 Both Statement A and Statement B are true.
3 Statement A is false but Statement B is true.
4 Statement A is true but Statement B is false.
JEE - 2023
CHXI11:THE P-BLOCK ELEMENTS

316060 Pick the reaction which is not a part of borax bead test for copper in copper sulphate.

1 \({\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{.10}}{{\text{H}}_{\text{2}}}{\text{O}}\xrightarrow[{{\text{heat}}}]{}{\text{N}}{{\text{a}}_{\text{2}}}{\text{}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ + }}{{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7}\xrightarrow[{{\text{heating}}}]{{{\text{strong}}}}2{\text{NaB}}{{\text{O}}_2} + {{\text{B}}_2}{{\text{O}}_3}\)
3 \(\mathrm{CuSO}_{4}+2 \mathrm{NaBO}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2} \cdot \mathrm{SO}_{4}\)
4 \(\mathrm{CuSO}_{4}+\mathrm{B}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}+\mathrm{SO}_{3}\)
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