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

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When a mixture of air and steam is passed over red-hot coke, the outgoing gas is:

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Important Questions on Chemistry

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Identify the correct statements from the following:

a) Silicones are hydrophobic in nature.

b) The repeating unit in silicones is

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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 $34 pm$ .

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The correct statement about silicone is

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What product is formed when

HF

reacts with glass?

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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?

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Example of a three-dimensional silicate is :

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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

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

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Dry ice is

MEDIUM

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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

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

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The role of haemoglobin is to

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The major products obtained in the reaction of oxalic acid with conc.

H_{2} S O_{4}

upon heating are

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

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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?

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

is used during polymerization of organosilicons because

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Water does not produce

CO

on reacting with :

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Zeolites are shape selective structures because of

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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.

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The gas evolved on heating

{CaF}_{2}

and

{SiO}_{2}

with concentrated

H_{2} {SO}_{4}

, on hydrolysis gives a white gelatinous precipitate. The precipitate is:

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What is the chief constituent of pyrex glass?

When a mixture of air and steam is passed over red-hot coke, the outgoing gas is:

Important Questions on Chemistry

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