Match the items in Column I with its main use listed in Column II : Column I Column II A Silica gel i . Transistor B Silicon ii . Ion-exchanger C Silicone iii . Drying agent D Silicate iv . Sealant

A - iii , B - i , C - iv , D - ii

A - iv , B - i , C - ii , D - iii

A - ii , B - i , C - iv , D - iii

A - ii , B - iv , C - i , D - iii

MEDIUM

Earn 100

Write any two uses of silicates.

Important Questions on The p-Block Elements

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Identify the incorrect statements from the following

I .

Tin in

+ 2

state acts as reducing agent while lead in

+ 4

state acts as strong oxidising agent.

II .

Silicon exists as both

{[{SiF}_{6}]}^{2 -}

and

{[{SiCl}_{6}]}^{2 -}

forms.

III .

The hybridisation of carbon in fullerene is

{sp}^{3}

IV .

Among

Ge, Sn

and

Pb

lowest melting point is for

Sn

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Among the following substituted silanes, the one which will give rise to cross linked silicone polymer on hydrolysis is?

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Si

reacts with

{CH}_{3} Cl

573 K

in the presence of

Cu

powder to form methyl substituted chlorosilanes. Among the given methyl substituted chlorosilanes, whose yield is minimum?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Which of the following organo-silicon compound on hydrolysis will given a three dimensional silicon ?

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Match the items in Column

I

with its main use listed in Column

II

	Column $I$		Column $II$
$A$	Silica gel	$i .$	Transistor
$B$	Silicon	$ii .$	Ion-exchanger
$C$	Silicone	$iii .$	Drying agent
$D$	Silicate	$iv .$	Sealant

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

The role of haemoglobin is to

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Identify the correct statements from the following:

a) Silicones are hydrophobic in nature.

b) The repeating unit in silicones is

Question Image

c) In a $C_{60}$ molecule, twenty $C_{6}$ rings and twelve $C_{5}$ rings are present.

d) Dehydration of formic acid by concentrated $H_{2} {SO}_{4}$ at $100^{o} C$ gives ${CO}_{2}$ .

e) The distance between two layers in graphite is $34 pm$ .

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Correct statements among regarding silicones are:
$(a)$ They are polymers with hydrophobic character.
$(b)$ They are biocompatible.
$(c)$ In general, they have high thermal stability and low dielectric strength.
$(d)$ Usually, they are resistant to oxidation and used as greases.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

The basic structural unit of feldspar, zeolites mica, and asbestos is:

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Identify the correct statements from the following:
(a)

{CO}_{2} (g)

is used as a refrigerant for ice cream and frozen food.
(b) The structure of

C_{60}

contains twelve six-membered carbon rings and twenty-five membered carbon rings.
(c)

ZSM - 5

, a type of zeolite, is used to convert alcohols into gasoline.
(d)

CO

is a colourless and odourless gas.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

{({CH}_{3})}_{3} SiCl

is used during polymerization of organosilicons because

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

What is the chief constituent of pyrex glass?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Dry ice is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Formic acid reacts with concentrated

H_{2} {SO}_{4}

100 ° C

to liberate

A

. When

A

is passed over heated ferric oxide,

B

and

C

are formed. What are

A, B

and

C

, respectively?

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

Water does not produce

CO

on reacting with :

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon

When any solid substance is kept in contact with liquid or gas, then liquid or gas are more adsorbed on the surface of solid rather than bulk. The process is known as adsorption. It is different from absorption. Many gaseous reactions occur in the presence of solid catalyst. Catalyst is a chemical substance which change the rate of reaction without undergoing itself change. This phenomenon is known as catalysis.

Write the name of Zeolite catalyst used to convert Alcohol to Petrol.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Some Important Compounds of Carbon and Silicon