11. THE P-BLOCK ELEMENTS
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NEET DIGITAL LIBRARY
11. THE P-BLOCK ELEMENTS

189997 Graphite is used as dry lubricant because of its

1 layer type structure
2 \(sp^3\) hybridisation
3 presence of dangling bonds
4 presence of two types of bond lengths
11. THE P-BLOCK ELEMENTS

189998 Borax has the molecular formula

1 \(Na_2[B_4O_3(OH)_4].6H_2O\)
2 \(Na_2[B_4O_5(OH)_4].6H_2O\)
3 \(Na_2[B_4O_5(OH)_4].8H_2O\)
4 \(Na_2[B_4O_6(OH)_2].8H_2O\)
11. THE P-BLOCK ELEMENTS

189999 Compare \(\pi  - \) bond strength between \(B\) and \(N\) given in two compounds\((I)\) $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}Si - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Si{{(C{H_3})}_3}}
\end{array}$     $(II)$ $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}C - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{(C{H_3})}_3}}
\end{array}$

1 There is no \(\pi -\) bond character between \(B\) and \(N\)
2 Same in \(I\) and \(II\)
3 \(I > II\)
4 \(II > I\)
11. THE P-BLOCK ELEMENTS

190000 \((i)\,Al\,\xrightarrow{{{N_2}}}\,A\)         \((ii)\,Al\,\xrightarrow{c}\,B\)Here \(A\) and \(B\) on hydrolysis respectively gives

1 \(NH_3, \,C_2H_2\)
2 \(NO,\, CH_4\)
3 \(NH_3,\,CH_4\)
4 \(NO,\,C_2H_2\)
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11. THE P-BLOCK ELEMENTS

189997 Graphite is used as dry lubricant because of its

1 layer type structure
2 \(sp^3\) hybridisation
3 presence of dangling bonds
4 presence of two types of bond lengths
11. THE P-BLOCK ELEMENTS

189998 Borax has the molecular formula

1 \(Na_2[B_4O_3(OH)_4].6H_2O\)
2 \(Na_2[B_4O_5(OH)_4].6H_2O\)
3 \(Na_2[B_4O_5(OH)_4].8H_2O\)
4 \(Na_2[B_4O_6(OH)_2].8H_2O\)
11. THE P-BLOCK ELEMENTS

189999 Compare \(\pi  - \) bond strength between \(B\) and \(N\) given in two compounds\((I)\) $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}Si - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Si{{(C{H_3})}_3}}
\end{array}$     $(II)$ $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}C - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{(C{H_3})}_3}}
\end{array}$

1 There is no \(\pi -\) bond character between \(B\) and \(N\)
2 Same in \(I\) and \(II\)
3 \(I > II\)
4 \(II > I\)
11. THE P-BLOCK ELEMENTS

190000 \((i)\,Al\,\xrightarrow{{{N_2}}}\,A\)         \((ii)\,Al\,\xrightarrow{c}\,B\)Here \(A\) and \(B\) on hydrolysis respectively gives

1 \(NH_3, \,C_2H_2\)
2 \(NO,\, CH_4\)
3 \(NH_3,\,CH_4\)
4 \(NO,\,C_2H_2\)
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11. THE P-BLOCK ELEMENTS

189997 Graphite is used as dry lubricant because of its

1 layer type structure
2 \(sp^3\) hybridisation
3 presence of dangling bonds
4 presence of two types of bond lengths
11. THE P-BLOCK ELEMENTS

189998 Borax has the molecular formula

1 \(Na_2[B_4O_3(OH)_4].6H_2O\)
2 \(Na_2[B_4O_5(OH)_4].6H_2O\)
3 \(Na_2[B_4O_5(OH)_4].8H_2O\)
4 \(Na_2[B_4O_6(OH)_2].8H_2O\)
11. THE P-BLOCK ELEMENTS

189999 Compare \(\pi  - \) bond strength between \(B\) and \(N\) given in two compounds\((I)\) $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}Si - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Si{{(C{H_3})}_3}}
\end{array}$     $(II)$ $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}C - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{(C{H_3})}_3}}
\end{array}$

1 There is no \(\pi -\) bond character between \(B\) and \(N\)
2 Same in \(I\) and \(II\)
3 \(I > II\)
4 \(II > I\)
11. THE P-BLOCK ELEMENTS

190000 \((i)\,Al\,\xrightarrow{{{N_2}}}\,A\)         \((ii)\,Al\,\xrightarrow{c}\,B\)Here \(A\) and \(B\) on hydrolysis respectively gives

1 \(NH_3, \,C_2H_2\)
2 \(NO,\, CH_4\)
3 \(NH_3,\,CH_4\)
4 \(NO,\,C_2H_2\)
NEET DIGITAL LIBRARY
11. THE P-BLOCK ELEMENTS

189997 Graphite is used as dry lubricant because of its

1 layer type structure
2 \(sp^3\) hybridisation
3 presence of dangling bonds
4 presence of two types of bond lengths
11. THE P-BLOCK ELEMENTS

189998 Borax has the molecular formula

1 \(Na_2[B_4O_3(OH)_4].6H_2O\)
2 \(Na_2[B_4O_5(OH)_4].6H_2O\)
3 \(Na_2[B_4O_5(OH)_4].8H_2O\)
4 \(Na_2[B_4O_6(OH)_2].8H_2O\)
11. THE P-BLOCK ELEMENTS

189999 Compare \(\pi  - \) bond strength between \(B\) and \(N\) given in two compounds\((I)\) $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}Si - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Si{{(C{H_3})}_3}}
\end{array}$     $(II)$ $\begin{array}{*{20}{c}}
{{{\left( {C{H_3}} \right)}_3}C - NB{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{(C{H_3})}_3}}
\end{array}$

1 There is no \(\pi -\) bond character between \(B\) and \(N\)
2 Same in \(I\) and \(II\)
3 \(I > II\)
4 \(II > I\)
11. THE P-BLOCK ELEMENTS

190000 \((i)\,Al\,\xrightarrow{{{N_2}}}\,A\)         \((ii)\,Al\,\xrightarrow{c}\,B\)Here \(A\) and \(B\) on hydrolysis respectively gives

1 \(NH_3, \,C_2H_2\)
2 \(NO,\, CH_4\)
3 \(NH_3,\,CH_4\)
4 \(NO,\,C_2H_2\)
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