Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

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A: $H_{3} B O_{3}$ is monobasic Lewis acid.

R: Boric acid has planar structure in which $B O_{3}^{3 -}$ units are joined by H-bonding.

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Important Questions on The p-Block Elements

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Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The green colour produced in the borax bead test of a chromium(III) salt is due to -

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Hydrolysis of

B C l_{3}

gives X which on treatment with sodium carbonate produces

Y, X

and

Y

respectively, are

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Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Diborane

(B_{2} H_{6})

reacts independently with

O_{2}

and

H_{2} O

to produce, respectively:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

A mixture of Boron trichloride and hydrogen is subjected to silent electric discharge to form

x

and

HCl

.

x

is mixed with

{NH}_{3}

and heated to

200^{0} C

to form

y

. The formula of

y

is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

{AlF}_{3}

is soluble in

HF

only in presence of

KF

. It is due to the formation of

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Choose the correct statements about diborane;
I. It is prepared by the oxidation of sodium borohydride with iodine.
II. It undergoes cleavage reactions with Lewis bases to give borane adducts.
III. It is produced on an industrial scale by the reaction of

{BF}_{3}

with

{LiAlH}_{4}

.
IV. It is readily hydrolysed by water to give borazine.
V. It burns in oxygen and gives boron trioxide.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The Lewis acid strength of

B B r_{3}, B C l_{3}

and

B F_{3}

is in the order

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Which of the following represents the structure of inorganic benzene?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

A l_{2} {(S O_{4})}_{3}

is used for a variety of purposes but not

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

A l_{2} O_{3}

reacts with

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Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

When aqueous solutions of borax is acidified with

HCl

, we get

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

When a mixture of diborane and ammonia is heated, the final product is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The order of acidic strength of boron trihalides

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The reaction of

H_{3} N_{3} B_{3} C l_{3} (A)

with

L i B H_{4}

in tetrahydrofuran gives inorganic benzene

(B)

. Further, the reaction of

(A)

with

(C)

leads to

H_{3} N_{3} B_{3} {(M e)}_{3}

. Compounds

(B)

and

(C)

respectively, are:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

In diborane ____ are present.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

A Lewis acid

' X'

reacts with

{LiAlH}_{4}

in ether medium to give a highly toxic gas. This gas when heated with

{NH}_{3}

gives a compound commonly known as inorganic benzene. The gas is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

H_{3} {BO}_{3}

is

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

In the structure of borax, the numbers of boron atoms and B - O - B units, respectively, are

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

Boric acid is an acid because its molecule

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Chemistry>Inorganic Chemistry>The p-Block Elements>Important Compounds of Group 13 Elements

The number of

2

-centre-

2

-electron and

3

-centre-

2

-electron bonds in

B_{2} H_{6}

, respectively, are: