Anamolous Behaviour of Boron

Q.

All nonmetals except( hydrogen) form negatively charged ions ___in their valence shell(Donate /Accept)

Q. Boron compounds behave as Lewis acids because of their

1. Acidic nature
2. Covalent nature
3. Vacant orbital
4. Ionization property

Q. $BC{l}_3$ does not exist as a dimer but $B{H}_3$ exists as a dimer because:

1. Chlorine is more electronegative than hydrogen
2. There is a $p\pi -p\pi$ back bonding in $BC{l}_3$ but $B{H}_3$ does not contain such bonds
3. Large sized chlorine atoms do not fit in between the boron atoms whereas small sized hydrogen atoms fit in between the boron atoms
4. None of the above

Q. Which one of the following elements is unable to form $M{F}_6^{3–}$ ion?

1. $B$
2. $Al$
3. $Ga$
4. $In$

Q.

B${}_2$O${}_3$ + C + Cl${}_2$$\to A+B.A\&B$ are?

1. $BC{l}_2$, $C{O}_2$

2. $BC{l}_3$, $C{O}_2$

3. $BC{l}_3,CO$

4. $BC{l}_2,CO$

Q.

$Al{F}_3+B_2{O}_3$$\to$ ________ $+B{F}_3$

1. $A{l}_2{O}_3$

2. $A{l}_2{O}_2$

3. $Al{O}_3$

4. $Noneofthese$

Q.

B${}_2$O${}_3$ + C + Cl${}_2$$\to A+B.A\&B$ are?

1. $BC{l}_2$, $C{O}_2$

2. $BC{l}_3$, $C{O}_2$

3. $BC{l}_3,CO$

4. $BC{l}_2,CO$

Q.

$H_{3}B{O}_3\stackrel{T_1}{⟶}\times \stackrel{T_2}{⟶}Y\stackrel{Redhot}{⟶}{B}_2{O}_3$

If $T_1$$<$$T_2$ then X and Y respectively are

1. X = Metaboric acid and Y = Tetraboric acid

2. X = Tetraboric acid and Y = Metaboric acid

3. X = Borax and Y = Metaboric acid

4. X = Tetraboric acid and Y = Borax

Q.

$H_{3}B{O}_3\stackrel{T_1}{⟶}\times \stackrel{T_2}{⟶}Y\stackrel{Redhot}{⟶}{B}_2{O}_3$

If $T_1$$<$$T_2$ then X and Y respectively are

1. X = Metaboric acid and Y = Tetraboric acid

2. X = Tetraboric acid and Y = Metaboric acid

3. X = Borax and Y = Metaboric acid

4. X = Tetraboric acid and Y = Borax