189692
Which of the following is the electron deficient molecule
1 \({B_2}{H_6}\)
2 \({C_2}{H_6}\)
3 \(P{H_3}\)
4 \(Si{H_4}\)
Explanation:
(a)\({B_2}{H_6}\)
11. THE P-BLOCK ELEMENTS
189693
In Hall’s process, the main reagent is mixed with
1 \(NaF\)
2 \(N{a_3}Al{F_6}\)
3 \(Al{F_3}\)
4 None of these
Explanation:
(b) Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about \(2000\,^°C\) and at this temperature when the electrolysis is carried of fused mass the metal formed vapoureses as the boiling point of \(Al\) is \(1800\,^°C\). To overcome this difficulty, \(N{a_3}Al{F_6}\) and \(Ca{F_2}\) are mixed with alumina.
11. THE P-BLOCK ELEMENTS
189694
Acedic strength of Boron trihalide are in order of
1 \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\)
2 \(B{I_3} < BB{r_3} < BC{l_3} < B{F_3}\)
3 \(BB{r_3} < BC{l_3} < B{F_3} < B{I_3}\)
4 \(B{F_3} < B{I_3} < BC{l_3} < BB{r_3}\)
Explanation:
(a) Concentration of Lewis acid of boron tri halides is increased in following order. \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\).
11. THE P-BLOCK ELEMENTS
189695
Carbon and silicon belong to \((IV)\) group. The maximum coordination number of carbon in commonly occurring compounds is \(4\), whereas that of silicon is \(6\). This is due to
1 Large size of silicon
2 More electropositive nature of silicon
3 Availability of low lying \(d\) - orbitals in silicon
4 Both \((a)\) and \((b)\)
Explanation:
\(C -2 s ^2 2 p ^2\) \(Si -3 s ^2 3 p ^2\) Carbon has no \(d\)-orbital to expand but \(Si\) has vacant \(d\)-orbitals and it can expand its valency using these vacand \(d\)-orbitals and forms \(6\) coordinated compounds.
11. THE P-BLOCK ELEMENTS
189696
The ionic carbide is
1 \(ZnC\)
2 \(TiC\)
3 \(SiC\)
4 \(Ca{C_2}\)
Explanation:
Calcium carbide \(\left( CaC _2\right)\) is ionic as it is ionic compound remaining all are covalent carbides.
189692
Which of the following is the electron deficient molecule
1 \({B_2}{H_6}\)
2 \({C_2}{H_6}\)
3 \(P{H_3}\)
4 \(Si{H_4}\)
Explanation:
(a)\({B_2}{H_6}\)
11. THE P-BLOCK ELEMENTS
189693
In Hall’s process, the main reagent is mixed with
1 \(NaF\)
2 \(N{a_3}Al{F_6}\)
3 \(Al{F_3}\)
4 None of these
Explanation:
(b) Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about \(2000\,^°C\) and at this temperature when the electrolysis is carried of fused mass the metal formed vapoureses as the boiling point of \(Al\) is \(1800\,^°C\). To overcome this difficulty, \(N{a_3}Al{F_6}\) and \(Ca{F_2}\) are mixed with alumina.
11. THE P-BLOCK ELEMENTS
189694
Acedic strength of Boron trihalide are in order of
1 \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\)
2 \(B{I_3} < BB{r_3} < BC{l_3} < B{F_3}\)
3 \(BB{r_3} < BC{l_3} < B{F_3} < B{I_3}\)
4 \(B{F_3} < B{I_3} < BC{l_3} < BB{r_3}\)
Explanation:
(a) Concentration of Lewis acid of boron tri halides is increased in following order. \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\).
11. THE P-BLOCK ELEMENTS
189695
Carbon and silicon belong to \((IV)\) group. The maximum coordination number of carbon in commonly occurring compounds is \(4\), whereas that of silicon is \(6\). This is due to
1 Large size of silicon
2 More electropositive nature of silicon
3 Availability of low lying \(d\) - orbitals in silicon
4 Both \((a)\) and \((b)\)
Explanation:
\(C -2 s ^2 2 p ^2\) \(Si -3 s ^2 3 p ^2\) Carbon has no \(d\)-orbital to expand but \(Si\) has vacant \(d\)-orbitals and it can expand its valency using these vacand \(d\)-orbitals and forms \(6\) coordinated compounds.
11. THE P-BLOCK ELEMENTS
189696
The ionic carbide is
1 \(ZnC\)
2 \(TiC\)
3 \(SiC\)
4 \(Ca{C_2}\)
Explanation:
Calcium carbide \(\left( CaC _2\right)\) is ionic as it is ionic compound remaining all are covalent carbides.
189692
Which of the following is the electron deficient molecule
1 \({B_2}{H_6}\)
2 \({C_2}{H_6}\)
3 \(P{H_3}\)
4 \(Si{H_4}\)
Explanation:
(a)\({B_2}{H_6}\)
11. THE P-BLOCK ELEMENTS
189693
In Hall’s process, the main reagent is mixed with
1 \(NaF\)
2 \(N{a_3}Al{F_6}\)
3 \(Al{F_3}\)
4 None of these
Explanation:
(b) Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about \(2000\,^°C\) and at this temperature when the electrolysis is carried of fused mass the metal formed vapoureses as the boiling point of \(Al\) is \(1800\,^°C\). To overcome this difficulty, \(N{a_3}Al{F_6}\) and \(Ca{F_2}\) are mixed with alumina.
11. THE P-BLOCK ELEMENTS
189694
Acedic strength of Boron trihalide are in order of
1 \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\)
2 \(B{I_3} < BB{r_3} < BC{l_3} < B{F_3}\)
3 \(BB{r_3} < BC{l_3} < B{F_3} < B{I_3}\)
4 \(B{F_3} < B{I_3} < BC{l_3} < BB{r_3}\)
Explanation:
(a) Concentration of Lewis acid of boron tri halides is increased in following order. \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\).
11. THE P-BLOCK ELEMENTS
189695
Carbon and silicon belong to \((IV)\) group. The maximum coordination number of carbon in commonly occurring compounds is \(4\), whereas that of silicon is \(6\). This is due to
1 Large size of silicon
2 More electropositive nature of silicon
3 Availability of low lying \(d\) - orbitals in silicon
4 Both \((a)\) and \((b)\)
Explanation:
\(C -2 s ^2 2 p ^2\) \(Si -3 s ^2 3 p ^2\) Carbon has no \(d\)-orbital to expand but \(Si\) has vacant \(d\)-orbitals and it can expand its valency using these vacand \(d\)-orbitals and forms \(6\) coordinated compounds.
11. THE P-BLOCK ELEMENTS
189696
The ionic carbide is
1 \(ZnC\)
2 \(TiC\)
3 \(SiC\)
4 \(Ca{C_2}\)
Explanation:
Calcium carbide \(\left( CaC _2\right)\) is ionic as it is ionic compound remaining all are covalent carbides.
189692
Which of the following is the electron deficient molecule
1 \({B_2}{H_6}\)
2 \({C_2}{H_6}\)
3 \(P{H_3}\)
4 \(Si{H_4}\)
Explanation:
(a)\({B_2}{H_6}\)
11. THE P-BLOCK ELEMENTS
189693
In Hall’s process, the main reagent is mixed with
1 \(NaF\)
2 \(N{a_3}Al{F_6}\)
3 \(Al{F_3}\)
4 None of these
Explanation:
(b) Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about \(2000\,^°C\) and at this temperature when the electrolysis is carried of fused mass the metal formed vapoureses as the boiling point of \(Al\) is \(1800\,^°C\). To overcome this difficulty, \(N{a_3}Al{F_6}\) and \(Ca{F_2}\) are mixed with alumina.
11. THE P-BLOCK ELEMENTS
189694
Acedic strength of Boron trihalide are in order of
1 \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\)
2 \(B{I_3} < BB{r_3} < BC{l_3} < B{F_3}\)
3 \(BB{r_3} < BC{l_3} < B{F_3} < B{I_3}\)
4 \(B{F_3} < B{I_3} < BC{l_3} < BB{r_3}\)
Explanation:
(a) Concentration of Lewis acid of boron tri halides is increased in following order. \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\).
11. THE P-BLOCK ELEMENTS
189695
Carbon and silicon belong to \((IV)\) group. The maximum coordination number of carbon in commonly occurring compounds is \(4\), whereas that of silicon is \(6\). This is due to
1 Large size of silicon
2 More electropositive nature of silicon
3 Availability of low lying \(d\) - orbitals in silicon
4 Both \((a)\) and \((b)\)
Explanation:
\(C -2 s ^2 2 p ^2\) \(Si -3 s ^2 3 p ^2\) Carbon has no \(d\)-orbital to expand but \(Si\) has vacant \(d\)-orbitals and it can expand its valency using these vacand \(d\)-orbitals and forms \(6\) coordinated compounds.
11. THE P-BLOCK ELEMENTS
189696
The ionic carbide is
1 \(ZnC\)
2 \(TiC\)
3 \(SiC\)
4 \(Ca{C_2}\)
Explanation:
Calcium carbide \(\left( CaC _2\right)\) is ionic as it is ionic compound remaining all are covalent carbides.
189692
Which of the following is the electron deficient molecule
1 \({B_2}{H_6}\)
2 \({C_2}{H_6}\)
3 \(P{H_3}\)
4 \(Si{H_4}\)
Explanation:
(a)\({B_2}{H_6}\)
11. THE P-BLOCK ELEMENTS
189693
In Hall’s process, the main reagent is mixed with
1 \(NaF\)
2 \(N{a_3}Al{F_6}\)
3 \(Al{F_3}\)
4 None of these
Explanation:
(b) Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about \(2000\,^°C\) and at this temperature when the electrolysis is carried of fused mass the metal formed vapoureses as the boiling point of \(Al\) is \(1800\,^°C\). To overcome this difficulty, \(N{a_3}Al{F_6}\) and \(Ca{F_2}\) are mixed with alumina.
11. THE P-BLOCK ELEMENTS
189694
Acedic strength of Boron trihalide are in order of
1 \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\)
2 \(B{I_3} < BB{r_3} < BC{l_3} < B{F_3}\)
3 \(BB{r_3} < BC{l_3} < B{F_3} < B{I_3}\)
4 \(B{F_3} < B{I_3} < BC{l_3} < BB{r_3}\)
Explanation:
(a) Concentration of Lewis acid of boron tri halides is increased in following order. \(B{F_3} < BC{l_3} < BB{r_3} < B{I_3}\).
11. THE P-BLOCK ELEMENTS
189695
Carbon and silicon belong to \((IV)\) group. The maximum coordination number of carbon in commonly occurring compounds is \(4\), whereas that of silicon is \(6\). This is due to
1 Large size of silicon
2 More electropositive nature of silicon
3 Availability of low lying \(d\) - orbitals in silicon
4 Both \((a)\) and \((b)\)
Explanation:
\(C -2 s ^2 2 p ^2\) \(Si -3 s ^2 3 p ^2\) Carbon has no \(d\)-orbital to expand but \(Si\) has vacant \(d\)-orbitals and it can expand its valency using these vacand \(d\)-orbitals and forms \(6\) coordinated compounds.
11. THE P-BLOCK ELEMENTS
189696
The ionic carbide is
1 \(ZnC\)
2 \(TiC\)
3 \(SiC\)
4 \(Ca{C_2}\)
Explanation:
Calcium carbide \(\left( CaC _2\right)\) is ionic as it is ionic compound remaining all are covalent carbides.
