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

EASY

Earn 100

Why is silicon classified as metalloids?

Important Questions on The p-Block Elements

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

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 $34 pm$ .

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

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

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

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

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?

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.