An aqueous solution of borax is________.

(a)

neutral

(b)

acidic

(c)

basic

(d)

amphoteric

Boric acid is an acid because its molecule________.

(a)

contains replaceable H⁺ ion

(b)

gives up a proton

(c)

combines with proton to form water molecule

(d)

accepts OH^- from water, releasing proton.

Which among the following is not a borane?

(a)

B₂H₆

(b)

B₃H₆

(c)

B₄H₁₀

(d)

none of these

Lewis acid character of boron trihalides is as a follows _______.

(a)

BF₃ > BCl₃ > BBr₃ > BI₃

(b)

BCI₃ > BF₃ > BBr₃ > BI₃

(c)

BI₃ > BBr₃ > BCl₃ > BF₃

(d)

BI₃ > BF₃ > BCl₃ > BBr₃

Select the incorrect statement regarding B₂H₆.

(a)

It contains B-B ionic bond

(b)

Each boron is Sp³ hybridised

(c)

It has two types of hydrogen bonds

(d)

it is used as a reducing agent

Potash alum

(1)

(NH₄)₂SO₄·AI₂(SO₄)₃.24H₂O

Sodium alum

(2)

Na₂SO₄·AI₂(SO₄)₃·24H₂O

Ammonium alum

(3)

K₂SO₄·Cr₂(SO₄)₃.24.H₂O

Chrome alum

(4)

Inert gases

Group 18

(5)

K₂SO₄·Cr₂(SO₄)₃.24.H₂O

Write a short note on anomalous properties of the first element of p-block.

Describe briefly allotropism in p- block elements with specific reference to carbon.

How is boric acid extracted from borax?

Explain the formation of boron trifluoride.

Draw the structure of borazole B₃N₃H₆.

Give the uses of silicones.

AlCl₃ behaves like a lewis acid. Substantiate this statement.

Describe the structure of diborane.

Draw the structure of boric acid.

Give the uses of boric acid?

Write a note on zeolites.

What are the various methods by which carbon-di-oxide is prepared?

How are silicates classified? Give an example for each type of silicate.