Alum is found to contain hydrated monovalent
cation [M(H2O)6
]
+
, trivalent cation [M’(H2O)6
]
+3

and SO4
2– in the ratio of :

Which of the following statements is incorrect
in the context of the B-F bond in BF3
:-

Which of the following statements is incorrect
in relation to the structure of diborane

Borax Na2B4O7 .10H2O is actually

Aluminium is more reactive than iron. But
aluminium is less easily corroded than iron
because:-

Inorganic graphite is:-

Reactivity of borazole is greater than that of
benzene because : -

In potash alum, potassium and aluminium
are present as:-

Which of the followiong statements is correct:

On hydrolysis, diborane produces :

Boron has an extremely high melting point
because of

Diborane is Lewis acid forming addition
compound B2H6
.2NH3
with NH3
, a Lewis

base. This

Rubies and sapphire are chemically:

Which of the following statements is correct
in the context of diborane (B2H6

B2H6

reacts with (CH3
)
3N to produce:

In BF3

, the B-F bond length is 1.30 Å, when
BF3
is allowed to be treated with Me3N, it
forms an adduct, Me3N  BF3

, The bond

length of B-F in the adduct is:

When an inorganic compound (X) having 3c-
2e as well as 2c-2e bonds reacts with

ammonia gas at a certain termperature, gives
a compound (Y), isostructural with benzene.
Compound (X) with ammonia at a high
temperature produces a substance (Z) :

Among the following compounds of boron,
the species which also forms -bond in
addition  -bonds is:-

The type of hybridization of boron in diborane
is

Three centre two electron bond(3c – 2e) is
present in :-

Which of the following is electron deficient
compound :

Which hydride does not exist:

From B2H6

, all the following can be prepared
except

In B2H6

Aluminium is industrially prepared by

The states of hybridisation of boron and
oxygen atoms in boric acid (H3BO3
) are

respectively

Aluminium chloride exists as dimer, Al2Cl6
in
solid state as well as in solution of non-polar
solvents such as benzene. When dissolved
in water, it gives-

The structure of diborane contains

Heating an queous solution of aluminium
chloride to dryness will give :-

Which one of the following is the correct
statement

The role of fluorspar (CaF2

) which is added in
small quantities in the electrolytic reduction
of alumina dissolved in fused cryolite
(Na3AlF6
) is:

The two types of bonds present in B2H6
are

covalent and-

Electrolytic reduction of alumina to aluminium
by Hall-Heravlt process is carried out:-

Specify the coordination geometry around and
hybridisation of N and B atoms in a 1 : 1
complex of BF3
and NH3
–

H3BO3
is :-

B(OH)3

+ NaOH NaBO2

+ Na[B(OH)4
] + H2O
How can this reaction is made to proceed in
forward direction ?