Boron and its Compounds
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CHXI11:THE P-BLOCK ELEMENTS

316065 In the structure of Borax, how many \(\sigma\) bonds and no. of lone pairs present respectively?

1 30, 34
2 34, 34
3 32, 34
4 34, 30
CHXI11:THE P-BLOCK ELEMENTS

316066 An aqueous solution of borax is

1 Neutral
2 Amphoteric
3 Basic
4 Acidic
CHXI11:THE P-BLOCK ELEMENTS

316067 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7} \cdot 10{{\text{H}}_2}{\text{O}}\xrightarrow{\Delta }{\text{X}} + {\text{NaB}}{{\text{O}}_2} + {{\text{H}}_2}{\text{O}}\)
\({\text{X}} + {\text{C}}{{\text{r}}_2}{{\text{O}}_3}\xrightarrow{\Delta }{\text{Y}}\) (green colored)
The \(\mathrm{X}\) and \(\mathrm{Y}\) are

1 \({\text{N}}{{\text{a}}_{\text{3}}}{\text{B}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
3 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
4 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & CrB}}{{\text{O}}_{\text{3}}}\)
CHXI11:THE P-BLOCK ELEMENTS

316068 Which of the following can be detected by the borax-bead test?

1 \(\mathrm{Ni}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Pb}^{+2}\)
4 Both (1) & (2)
CHXI11:THE P-BLOCK ELEMENTS

316069 During the borax bead test with \(\mathrm{CuSO}_{4}\), a blue green colour of the bead was observed in oxidising flame due to the formation of

1 \(\mathrm{Cu}_{3} \mathrm{~B}_{2}\)
2 \(\mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}\)
3 CuO
4 Cu
JEE - 2023
NEET DIGITAL LIBRARY
CHXI11:THE P-BLOCK ELEMENTS

316065 In the structure of Borax, how many \(\sigma\) bonds and no. of lone pairs present respectively?

1 30, 34
2 34, 34
3 32, 34
4 34, 30
CHXI11:THE P-BLOCK ELEMENTS

316066 An aqueous solution of borax is

1 Neutral
2 Amphoteric
3 Basic
4 Acidic
CHXI11:THE P-BLOCK ELEMENTS

316067 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7} \cdot 10{{\text{H}}_2}{\text{O}}\xrightarrow{\Delta }{\text{X}} + {\text{NaB}}{{\text{O}}_2} + {{\text{H}}_2}{\text{O}}\)
\({\text{X}} + {\text{C}}{{\text{r}}_2}{{\text{O}}_3}\xrightarrow{\Delta }{\text{Y}}\) (green colored)
The \(\mathrm{X}\) and \(\mathrm{Y}\) are

1 \({\text{N}}{{\text{a}}_{\text{3}}}{\text{B}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
3 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
4 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & CrB}}{{\text{O}}_{\text{3}}}\)
CHXI11:THE P-BLOCK ELEMENTS

316068 Which of the following can be detected by the borax-bead test?

1 \(\mathrm{Ni}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Pb}^{+2}\)
4 Both (1) & (2)
CHXI11:THE P-BLOCK ELEMENTS

316069 During the borax bead test with \(\mathrm{CuSO}_{4}\), a blue green colour of the bead was observed in oxidising flame due to the formation of

1 \(\mathrm{Cu}_{3} \mathrm{~B}_{2}\)
2 \(\mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}\)
3 CuO
4 Cu
JEE - 2023
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CHXI11:THE P-BLOCK ELEMENTS

316065 In the structure of Borax, how many \(\sigma\) bonds and no. of lone pairs present respectively?

1 30, 34
2 34, 34
3 32, 34
4 34, 30
CHXI11:THE P-BLOCK ELEMENTS

316066 An aqueous solution of borax is

1 Neutral
2 Amphoteric
3 Basic
4 Acidic
CHXI11:THE P-BLOCK ELEMENTS

316067 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7} \cdot 10{{\text{H}}_2}{\text{O}}\xrightarrow{\Delta }{\text{X}} + {\text{NaB}}{{\text{O}}_2} + {{\text{H}}_2}{\text{O}}\)
\({\text{X}} + {\text{C}}{{\text{r}}_2}{{\text{O}}_3}\xrightarrow{\Delta }{\text{Y}}\) (green colored)
The \(\mathrm{X}\) and \(\mathrm{Y}\) are

1 \({\text{N}}{{\text{a}}_{\text{3}}}{\text{B}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
3 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
4 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & CrB}}{{\text{O}}_{\text{3}}}\)
CHXI11:THE P-BLOCK ELEMENTS

316068 Which of the following can be detected by the borax-bead test?

1 \(\mathrm{Ni}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Pb}^{+2}\)
4 Both (1) & (2)
CHXI11:THE P-BLOCK ELEMENTS

316069 During the borax bead test with \(\mathrm{CuSO}_{4}\), a blue green colour of the bead was observed in oxidising flame due to the formation of

1 \(\mathrm{Cu}_{3} \mathrm{~B}_{2}\)
2 \(\mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}\)
3 CuO
4 Cu
JEE - 2023
For More Updates join with Us
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CHXI11:THE P-BLOCK ELEMENTS

316065 In the structure of Borax, how many \(\sigma\) bonds and no. of lone pairs present respectively?

1 30, 34
2 34, 34
3 32, 34
4 34, 30
CHXI11:THE P-BLOCK ELEMENTS

316066 An aqueous solution of borax is

1 Neutral
2 Amphoteric
3 Basic
4 Acidic
CHXI11:THE P-BLOCK ELEMENTS

316067 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7} \cdot 10{{\text{H}}_2}{\text{O}}\xrightarrow{\Delta }{\text{X}} + {\text{NaB}}{{\text{O}}_2} + {{\text{H}}_2}{\text{O}}\)
\({\text{X}} + {\text{C}}{{\text{r}}_2}{{\text{O}}_3}\xrightarrow{\Delta }{\text{Y}}\) (green colored)
The \(\mathrm{X}\) and \(\mathrm{Y}\) are

1 \({\text{N}}{{\text{a}}_{\text{3}}}{\text{B}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
3 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
4 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & CrB}}{{\text{O}}_{\text{3}}}\)
CHXI11:THE P-BLOCK ELEMENTS

316068 Which of the following can be detected by the borax-bead test?

1 \(\mathrm{Ni}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Pb}^{+2}\)
4 Both (1) & (2)
CHXI11:THE P-BLOCK ELEMENTS

316069 During the borax bead test with \(\mathrm{CuSO}_{4}\), a blue green colour of the bead was observed in oxidising flame due to the formation of

1 \(\mathrm{Cu}_{3} \mathrm{~B}_{2}\)
2 \(\mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}\)
3 CuO
4 Cu
JEE - 2023
NEET DIGITAL LIBRARY
CHXI11:THE P-BLOCK ELEMENTS

316065 In the structure of Borax, how many \(\sigma\) bonds and no. of lone pairs present respectively?

1 30, 34
2 34, 34
3 32, 34
4 34, 30
CHXI11:THE P-BLOCK ELEMENTS

316066 An aqueous solution of borax is

1 Neutral
2 Amphoteric
3 Basic
4 Acidic
CHXI11:THE P-BLOCK ELEMENTS

316067 \({\text{N}}{{\text{a}}_2}\;{{\text{B}}_4}{{\text{O}}_7} \cdot 10{{\text{H}}_2}{\text{O}}\xrightarrow{\Delta }{\text{X}} + {\text{NaB}}{{\text{O}}_2} + {{\text{H}}_2}{\text{O}}\)
\({\text{X}} + {\text{C}}{{\text{r}}_2}{{\text{O}}_3}\xrightarrow{\Delta }{\text{Y}}\) (green colored)
The \(\mathrm{X}\) and \(\mathrm{Y}\) are

1 \({\text{N}}{{\text{a}}_{\text{3}}}{\text{B}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
2 \({\text{N}}{{\text{a}}_{\text{2}}}{{\text{B}}_{\text{4}}}{{\text{O}}_{\text{7}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
3 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & Cr}}{\left( {{\text{B}}{{\text{O}}_{\text{2}}}} \right)_{\text{3}}}\)
4 \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{ & CrB}}{{\text{O}}_{\text{3}}}\)
CHXI11:THE P-BLOCK ELEMENTS

316068 Which of the following can be detected by the borax-bead test?

1 \(\mathrm{Ni}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Pb}^{+2}\)
4 Both (1) & (2)
CHXI11:THE P-BLOCK ELEMENTS

316069 During the borax bead test with \(\mathrm{CuSO}_{4}\), a blue green colour of the bead was observed in oxidising flame due to the formation of

1 \(\mathrm{Cu}_{3} \mathrm{~B}_{2}\)
2 \(\mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}\)
3 CuO
4 Cu
JEE - 2023