8/20/2019 2nd PU Chemistry Feb 2015.pdf

1/3

BgNtead with

Sustalned Excellence

PART

.

A

I

Answer

ALL

of the

following (answer

€ach

question

iuone word

or

one setrtenee)

I.

Wbat

is

anisotropy?

2. Mention

the

factor

responsible

for

abnormal

molar

masses

3.

state

Raoult's law

of dilute

solutions containing

non-volatile

solutes.

4.

Why

does

conductance

decrease

with

increase

in

dih*ion?

5. What is peptisation?

6. Why

does CaO

react

with

silica to

form

the slag?

7.

Give

the equation

for

thepreparation

of

xenon

tioxide.

8.

Mention

the

condition

for

a compound

to

be

chiral.

[10x]=101

9. Given,

R-C:N

+

2[H]-&/Ig -+R-CH-NH

ol,,fto

,A.

IndentifyA

10.

What is meant

by denaturation

of

proteins?

PART.

B

II.

Answer

any FIVE

of

the following

(each question

carries

2

marks)

[5

x

2

=

10]

11,

Niobium

crystallizes

in

a

body

centered

cubic

stucture.

Its

density

is

8.55 g

em-3.

Calculate

the

atomic

radius

of niobium (Atomic

mass:93).

12.

calculate

the ernf

of the

cell in which

the

following

reaction

takes place.

,Ni(s)

+

2Ag* (0.002

M

+

Ni*

(0.160

M)+

2Ag(s)

Standard

errf ofthe

cell

=

+1.05

V.

13.

What is

a

zero order

reaction?

Give

an

example.

14.

What

are

interstitial

compounds?

Why transition

melals

form

interstitial

compounds?

15. Explain

Williamson's

reaction

with

an

example.

16.

Explain iodoform

reaction

with

an example.

17.

What

are

(i)

analgesics

and

(ii)

broad

spectnrn

antibiotics?

18.

What

are

artificial

sweetening

agents?

Give

two

o

8/20/2019 2nd PU Chemistry Feb 2015.pdf

2/3

PART.

G

IIL

Answer

anv

Flvx,,.orthe fo[owing

(each

question

carries

3

marrs)

--

9'

Desctibe

briefly

with

equation'

tr'"i'*iL

steps

invorved

in

rhe

extracrion

ofpig

iron

from

Ji;:,;i:i

0.

(a)

Give

the

reaction

of

conc.

HNOI

ana

dilute

HNO3

;;".

-

(i)

thermal

stability

(ii)

reducing

"f,"*.*

(ili)

apiAc

"i,urr"t*

I3l

2-

Describe

the

followjng

with,respect

to

halogen

family.

(ii)

Explain

rhe

oxidation

states

of

fralogei

family.

23.

Account

for

the

following

I3l

(i)

The

enthalpies

of atomisation

of

hansit.

(ii)

Transition

metars

;,*

ilffiffi,*

metats

are

high

(iii)

Mn2*

compo*r,

*.

,oo..

ouu,"

,r,*

#

::ffiHi:rrrsnetic.

24.

Compare

lanthanidt

t3l

(i)erecnonic#ililfctinidesT#;:.,ffi;I.*.

,iii\_ r.

25'

Discuss

the

narure

of

bonding,,

i"*;-

r;the

basis

of

varence

r""j?":T""t',*

:]

13l

6.Draw

crystal

field

splitting

of

d-orbitals

in

octahedral

field.

How

is

the

magnitude

Ao

affected

by

the

ature

ofligands?

t3l

Y'

1T*"

anv

rHREE.lr,o"

forrowins

(ea"ffil,;i..rries

5

marrrs)

7.

(a)

Mention

the

constituent

parficles;'---

.,

3#l;J},*.T]":T*::"::T:i{:i)^morecurar

sorids

Give

one

exampre

ror

each

;;;;#

[3x5=15]

t3l

t21

8.

(a)

?:r::'x;:#

,r'j'::'":1-:

1^t^:::,1:,zene

shows

a

depression

in

freezng

.62

"C.

Calculate

the

rv..e

rxuw)

a

oepressron

n

freezrng

point

equal

to

ntution.GivenK.^r.r.--:::1'li-:.11sociatio,n

of

the

acid

in

solurion

if

it

exists

aq

rrimcrc

i-

olution.

Given

Kr

of

benzene

ii

+.g

f

n

U

*"i;.

(b)

2e. (a)

What is reverse osmosis?

How

is

it

usefiit

as

dimers

in

13l

l3l

al

t3l

t2l

t3l

121

}:il::""

determination

of

srandard

erectrodepotentiar

of

zinc

erecrode

using

sthndardrr.;1

(b)

The

specific

conductance

of

0.02

M

NaI

is

0.235

S

cm_l.

Calculate

*lrr"r*

Oon*""

0.

l"l

Daive

the

integrated

rate

expression

,",

,

,

"**

r*lnoo""'""'

ft)

Define

(i)

threshold

en..gy

aod

--l

(ii)

temperature

coef,ficient

of

a

reaction.

,,

j:]

l*"ll

the

mechanism

of

enzyme

catarysis.

(b)

Desoibe

the

Freundlich

adsorptioo

iroti"r*.

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8/20/2019 2nd PU Chemistry Feb 2015.pdf

3/3

v'

Answer

any

FouR

ofthe

fortowiug

(each

question

carries

5

marks)

32'

(a)

lVrite

the

organic

product

formed

in the

forowing

reactions.

i

I

rl

[4x

5=201

+

CH3C}I2-CI

ACI'

-

(ii)

cH3CrLCHrcl

+

1g4y

acetone

>

heat

t3l

(iii)

CH3-CH2-CH:CI1

+

HBr

peroxide_,

*'

:::lilrwhv

chlorobenzene

is

Iess

reactive

than

haloarkanes

towards

nucreophilic

substirution

(i)

33.

(a)

Give

the

reaction

of

ethanol

u,ith.

(i)

benzoic

acid

and

conc.

H2SOa

(ii)PCC

(iii)

Excess

conc.

I{zSO+

at

443

K.

(b)

Explain

Kolbe,s

reaction.

121

t3l

JJ

a'

@)

*r:m"#fTT*",1,jtr'-Y

romura

"lt*

on

hvdrolvsis

in

acid

medium

gives

a

ffi

H[:J'f,,:,*T:l1*,y1]1:,,rd;';;*il'#r""jHHl;ff ;

H"T,trf3;l'::

rornrs

a

ketone

c

with

acetvt

ctro.iil;;.;:T,;H;fff;:,;

Identify,\

B

and

C.

 b)

Given

CH,

-

CHO

--IEL:M --r

1

Kor{+orhy'm

gryor

,

y

.

What

are

X

and

y?

35' (a)

Distinguish

primary'

secondary

and

tertiary

amines

with

Hinsberg

reagent-

Give

equations.

b)

Give

the

preparation

of

erhanamine

by

Gabrier

phtharimide

synthesis.

36.

(a)

Elucidate

the

open

chain

srmcture

ofglucose.

(b,)

Briefly

explainthe

sfucture

of

DNAiolecule.

37

'

(a)

what

is

chain

growth porymerization?

Give

the

synthesis

of polyacryronitrile.

(b)

What

is

copoiymerization?

Give

an

example.

t3l

12)

,n

t3l

I2l

t3l

12)

t3I

t2l

**{<

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