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.

In diborane, the number of electrons that accounts for banana bonds is ________.

(a)

six

(b)

two

(c)

four

(d)

three

Carbon atoms in fullerene with formula C₆₀ have _______hybridisation.

(a)

sp³ hybridised

(b)

sp hybridised

(c)

sp² hybridised

(d)

partially sp² and partially sp³ hybridised

Oxidation state of carbon in its hydrides _______.

(a)

+4

(b)

-4

(c)

+3

(d)

+2

The repeating unit in silicone is_______.

(a)

SiO₂

(b)

(c)

(d)

Which of the following is not sp² hybridised?

(a)

Graphite

(b)

graphene

(c)

Fullerene

(d)

dry ice

Column-I		Column-II
A	Borazole	1	B(OH)3
B	Boric acid	2	B3N3H6
C	Quartz	3	Na2[B4O5(OH)4]8H2O
D	Borax	4	SiO2

(a)

A	B	C	D
2	1	4	3

(b)

A	B	C	D
1	2	4	3

(c)

A	B	C	D
1	2	4	3

(d)

None of these

The compound that is used in nuclear reactors as protective shields and control rods is _________.

(a)

Metal borides

(b)

metal oxides

(c)

Metal carbonates

(d)

metal carbide

The stability of +1 oxidation state increases in the sequence ________.

(a)

Al < Ga < In < Tl

(b)

Tl < In < Ga < Al

(c)

In < Tl < Ga < Al

(d)

Ga< In < Al < Tl

The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence _______.

(a)

TI < In < Ga < Al

(b)

In < TI < Ga < Al

(c)

Ga < In < Al < TI

(d)

Al < Ga < In < TI

SiO₄^4- ion has ____ geometry.

(a)

Triangular

(b)

Tetrahedral

(c)

Linear

(d)

Pentagonal bipyramidal

Which of the following statements about H₃BO₃ is not correct?

(a)

It has a layer structure in which planar BO₃ units are joined by H-bonds

(b)

It is a strong tribasic acid

(c)

It is prepared by acidifying an aqueous solution of borax

(d)

It does not act as proton donor but acts as lewis acid by accepting hydroxyl ion

Elements of group 13 mainly form covalent compounds because ______

(a)

small size

(b)

electro negativity values are high

(c)

ionization energy is very high

(d)

both (a) and (c)

Allotropy is due to ______.

(a)

difference in chemical properties

(b)

difference in the number of atoms in the molecules

(c)

difference in the arrangement of atoms in the molecules in the crystal

(d)

None of these

The silicates which contain discrete tetrahedral units are _______.

(a)

ortho silicates

(b)

sheet silicates

(c)

pyrosilicates

(d)

three dimensional silicates

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

Give the uses of Borax

Write a note on Fisher tropsch synthesis.

Give the structure of CO and CO₂.

What are alums?

Give the uses of alum.

What is oxo process?

What is tetraethoxy silane? How is it obtained?

What are silicones?

Name the building block of zeolites. Why zeolites have high porosity?

Give the uses of silicones.

Describe the structure of diborane.

Write a note on metallic nature of p-block elements.

Draw the structure of boric acid.

What happens to boranes at high temperatures?

What are the uses of diborane?

Describe the structure of fullerenes.

Describe the structure of graphene.

How is CO₂ manufactured?

Account for the following:
(i) CO is used in the extraction of metals.
(ii) CO is poisonous
(iii) CO₂ is used in referigeration

How will you identify borate radical?

How will you convert boric acid to boron nitride?

A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). Identify A, B and C.

A double salt which contains fourth period alkali metal (A) on heating at 500K gives (B). Aqueous solution of (B) gives white precipitate with BaCl₂ and gives a red colour compound with alizarin. Identify A and B.

CO is a reducing agent. Justify with an example.

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

Distinguish between diamond and graphite.