Chemistry Question Bank

Alumina may be converted into anhydrous aluminium chloride by:

The incorrect statement regarding above reactions is:

Select the true statements: (i) The formula of the corundum is Al2O3. (ii) The formula of cryolite is Na3AlF6. (iii) The formula of borax is Na2B4O7.10H2O (iv) The formula of bauxite is Al2O3.H2O

In the purification of bauxite by Hall’s process:

AIF3 is soluble in HF only in presence of KF. It is due to the formation of

When excess of NaOH solution is added in potash alum, the product is:

Complex formation is more likely to be possible in _____

Al2O3 formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:

Aluminium vessels should not be washed with materials containing washing soda since :

The main factor responsible for weak acidic nature of B—F bonds in BF3 is:

BCl3 does not exist as a dimer but BH3 exists as B2H6 because

Which one of the following is the correct statement ?

The hardest compound of boron is:

Boron cannot form which one of the following anions? (a) BF- (b) BH-

NaBH4 + I2 ® X + Y + Z BF3 + NaH 450 K ¾¾¾® X + P BF3 + LiAlH4 ® X + Q + R X, Y, Z, P, Q and R in the reactions are X Y Z P Q R (a) Na4B4O7 NaI HI HF LiF AlF3 (b) B2H6 NaI H2 NaF LiF AlF3 (c) B2H6 BH3 NaI B3N3H6 Al2F…

Boron nitride can be represented by the given structure. The structure of BN is similar to

The bonds present in borazole are:

Which of the following compounds is known as inor- ganic benzene?

Borazole, B3N3H6 is related to benzene as:

In B2H6:

The structure of diborane (B2H6) contains :

In diborane, the two H – B – H angles are nearly :

The type of hybridization of boron in diborane is

In diborane,

On hydroloysis, diborane produces