2nd PU Chemistry July 2015.pdf

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34

(NS)

ii)

Part

-

A carries

1

0

marks.

Each

question

canies

one

mark.

Part-

B carries

1

A

marks.

Each

question

carriestwo

ma*s.

P a

rl

-

C

c a

rri

es

1

5

m arks.

Ea

c

h

qu

estion

canies

th

re

m

arl<s.

Part

-

D carries

35

marks. Each

guestion

carriesfive

marks,

iii)

Write balanced

chemical equations

and-Qqw

diagrams

wherevernecessary.

iv)

Use

log

tables and

the simple

(06n4t

fllse

of

scientific

calculator

is ilot allowed.l

=l

*:Tilttu

ttttt

tttttllltt

ll tul

7"1)uL

(Ensrishversion)

T

D2

C

caper

has

v;ffiffiF{i,

u,,

compulsory.

PARr-A

aiN-fu

lf

\-/:-

I

.

Answer all

the

questions.

Each

question

carries

one

mark.

(Answer

each

question

in

one

word or

one

sentence).

(10x1

=10)

1)

On

what factorthe

value of colligative

property

depends

?

2)

Give an

example

for

liquid

solution

in

which

solute

is

gas.

3)

How many Coulombs

of

electricity

required to

oxidise one

mole of

Alto

Al3+ ?

4) ln azeroorder

reaction,

the time taken

to

reduce the concentration

of

reactant

from 50 %

to

25

o/o

is 30 minutes.

What is the

time

required

to

reduce the

concentration

f rom 25

o/o

lo

12.5

"/"

?

5)

Name

the enzyme

used

in

the inversion

of cane

sllgar.

Second PUC Chemistry July, 2015 Question Paper

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34

(NS)

6) V\fhich

nietal

is

refined

by

Van-4rkel

method

?

7)

Name

the

noble

gas

which

does not

have

general

noble

gas

configuration

ns2

np6.

B) R-X+l'rlal

^."%,

R-t+NaX

What

is

the name

of reaction

?

Which

oxldising

agent

used in Etard-reaction

?

Write

the

generalstructure

o{

Zwitter

ion.

PART-

B

ll.

Answeranyfive

of the

following.

Each

question

carries

two

marks.

11)

Give

anytwo

differences

between

Frenketand Schottky defects.

12')

State:

i)

Kohlrausch's

law

ii)

Faraday

first law

of

electrolysis

(5x2=10)

13)

Calculate

the half-life period

of

a first

order reaction,

if

the

rate

constant

of

the reaction

is

6.g3

x 10-3

S-1.

14)

Give

reasons:

'

i)

Actinoids

showvariable

oxidation

states.

ii)

Cerium

(Ce)

exhibits

+4

oxidation

state.

-1G

e)

10)

:.

./

l\























































































































__

34

(NS)

a)

Write

the,luPAC

narne

of rnajor

product

formed

in

FriedelCrafts

acylation

of

anisole.

b)

Complete

the

reaction

l

t.

ocH3

I

--

LU

+Hl

---->

How

are carlcoxytic

acid

prepared

from

Grignard

reagent

?

What are

antibiotics

?

Give an example.

What

is

Saponification

?

Give

the

equation

to form

sodium stearate

by

this

method.

PART.C

lll.

Answer

any,tive

of the fotlowing.

Each

question

carriesthree

marks.

(5x3=15)

.:

19)

Explain

the

reducing

behaviour

cif

carbon in

the

extraction

of

iron

using

20)

a) Name

the'gas liberated

when

zinc

reactswith

dil. HNog

b)

Give

.eason

:

-1

1-

,l

Lj

I

16)

17)

18)

ri

rl

l

:i)

PHB

has lower

boiling

pointthan

NH,

ii)

Nitrogen

is

less

reactive

at roorn

temperature.

(1+2)

,

l

rl



























































































































34

(NS)

21\

-12.

Give

the

principles

involved

in

the

manutacture

of

sulphuric

acid

by

contact

lrmllllillillilt

process

with

equations.

2\

a)

Complete

the

reaction

Cl, +

2H2O

+

SO,

-----)

b)

i)

Which

halogen

has

highestelectron

affinityqelectron

gain

enthalpy?

ii)

Give

the

structure

of

perchtoric

acid.

23)

a)

3d-series

etements

exhibitvariable

oxidation

states.

why

?

b)

Calculate

the

magnetic

moment

of

Mn2+

ion.

[Atomic

number

of

Mn

=

25].

24)

Describe

the

manufacture

of

potassium

dichromate

from

chromite

ore.

'(1+2;

(1+2)

\

t

aS

25)

with

the

help

of Valence

Bond

Theory

UBT)

explain

hybridisation,

geometry

and

magnetic

properv

of

[coFu]r-,

hexafruoridocobartate

(ilr)

ion.

[Atomic

number

of

Co

_

Zt]

26)

a)

What is

the

tupAC

name

ot

[cr1Nn.).

(Hro).]

ct,

r

b)

Give the

facial (fac)

and

meridional

(mer)

isomeric

structures

of

[co6n.;.

(Nor).]

(1+2)





-13-

PART-

D

r-

34

(r\rs)

lV.

Answer

any

three

of the following.

Each

question

carriesf ive

marks.

(3xS=1S)

27)

a)

Calculate

the

packing

efficiency

in Body

Centred

Cubic

(BCC)

lattice.

b)

An

element having

atomic

mass

107.9

gmoFt

has

fcc

unit

cell. The

edge

length

of unit

cell

is

408.6

pm.

Catculate

the density

of

the

unit

cell.

.:

[Given

NA

=

6.022x

1023

mol-l].

(3+2)

z\f)

The boiling point

of benzene

is

353.23

K

when

1.80 g

of

a

non-volatite,

/

non-ionising

solute was

dissolved

in

90

g

of benzene,

the

boiling

point

is

raised

to

354.1 1

K.

calculate

the

motar

mass

of

the

solute.

[Given

Ko for

benzene

=

2.53

K

kg

mol-t]

b) Write

two

differences

between

idealand

non-idealsolutions.

(3+z)

/

29/

a)

Draw

the neat

labelled

diagram

of

Standard

Hydrogen

Electrode

(St-lE)

/-

/

and

write

its

symbolic

representation.

b)

Calculate

the

emf

of

the

cell

in

which

the following

reaction

takes

place

Ni(r)

+

ZAglo.oorrur

+Nito1,uo,+

?-Ag1s1

i

[Given

F3",,

=

1.05

V]

(2+3]

Derive

integrated

rate

equation

for

rate

constant

of zero

order

reaction.

Showthatthe

rate

of

first

order reaction

is

doubled

when

concentration

of

the reactant

is

doubled.

(B+2)

30)

a)

b)

































































































































































































_

34

(NS)

.1+

31)

a)

i)

Give

any

two

characteristics

of

chemisorption.

ii)

What

is

meant by selectivity of

a

catalyst

?

b)

Define:

i)

Brownian

movement

ii)

Tyndatteffect.

V'

Answer

any

four

of

the

following.

Each

question

carries f

ive

marks.

32)

a)

i)

Exptain

the

SNz

mechanism.

c)

What

are

enantiomers

?

33)

a)

Explain

the

Kolbe,s

reaction.

b)

Complete

the reactions

:

,

i)

R-cH2-oH-#il

I

ii)

@

ton'f*o.,

write

the

general

equation

of

wiiliamson's

ether

synthesis.

ii)

What

is

the reagent

used

in

the

conversion

of

alkyl halide

into

alkene

?

b)

Comptete

the reaction

CH.-CHr-Br+AgCN--T-

(3+2)

(4x5

=

20)

(3+1+1)

c)

(2+2+11













































































































34

(NS)

a)

How

would

you

prepare

acetaldehyde

from

acetyl

chloride. Name

the

reaction.

b)

Name the reagent

used in the

conversion

of

ketone to hydrocarbon.

Name

the

reaction.

c)

Acetaldehyde

does not undergo

Cannizzaro's

reacJion.

Why

?

(2+2+1\

35) a) Name

the

major

product

formed when

nitrous

acid

is

treated

with

i) methylamine

ii)

aniline at

low

temperature.

b)

Explain

the Hoffmann's

bromamide reaction.

c)

Write

the IUPAC name

of

(CH3)2

N

-

CH2

-

CHs

.

36) a) Givethe Haworth

structure

of lactose.

b) What are

hormones

?

Give

an example.

c)

Which

nitrogenous

base

present

in

DNA

but not in RNA

?

37)

a)

How is

neoprene

prepared

?

b)

What

are

bio-degradable

polymers

?

Give exampte.

c) What

is

vulcanisation

?

(2+2+1)

(2+2+11

(2+2+11

-15-






















































































































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