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Eamcet 2014 Engineering Key Solutions AndhracollegesRatings: (0)|Views: 142|Likes: 0

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2 2 M a y 2 0 1 4 E A M C E T 2 0 1 4 - E N G I N E E R I N G

1

P A P E R ( C O D E -A ) 38

136.Which one of the following correctly represents the variation of electronegativity (EN) withatomic

number (Z) of group 13 elements ?

(1) (2) (3) (4)

Key: 3Sol:

Conceptual

137.Which one of the following elements reacts with steam ?

(1)

Ge

(2)

Si

(3)

Sn

(4)

C

Key: 3Sol:

Conceptual

138.What are X and Y in the following reaction ? uv22

C F C l X + Y

(1) 242

C F , C l ( 2 ) 2

C F C l , F ( 3) 22

CCl,F

:

(4) 2

CFCl,Ci

Key: 4Sol:

Conceptual

139.What are the shapes of ethyne and methane ?

( 1 ) t e t r a h e d r a l a n d t r i g o n a l p l a n a r ( 2 ) l i n e a r a n d t e t r a h e d r a l ( 3 ) t r i g o n a l p l a n a r a n d l i n e a r ( 4 ) s q u a r e p l a n a r a n d l i n e a r

Key: 2Sol:

Conceptual

140.What is Z in the following reaction ? NaOHCaO+322

Δ

C H - C H -C O N a Z

( 1 ) n -b u t a n e ( 2 ) e t h a n e ( 3 ) e t h y n e ( 4 ) p r o p a n e

Key: 2Sol:

NaOHCaO+3 22 3 3

Δ

C H - C H -C O N a C H -C H

De carboxilation in presence of sodalime

141.Which one of the following gives sooty flame on combustion ?

(1) 4

C H ( 2 )

26

C H ( 3 ) 66

C H ( 4)24

CH

Key: 3Sol:

Conceptual

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2 2 M a y 2 0 1 4 E A M C E T 2 0 1 4 - E N G I N E E R I N G P A P E R ( C O D E -A ) 39

142.Which one of the following elements on doping with

germanium, make it a p-type semiconductor

(1)

Sb

(2)

As

(3)

Ga

(4)

Bi

Key: 1Sol:

Conceptual

143.The molar mass of a solute X in g 1

m o l ,

if its 1% solution is isotonic with a 5% solution of canesugar (molar mass 1

=342gmol

), is

(1)

34.2

(2)

136.2

(3)

171.2

(4)

68.4

Key: 4Sol:

Osmatic pressure of

x

Osmatic pressure of cane sugar 1 1 0 0 0 5 1 0

0 0 × × R T =× × R T M 1 00 3 4 2 1 0 0

M=68.4

144.Vapour pressure in mm Hg of 0.1 mole of urea in 180 g of water at 0

25C

is(The vapour pressure of water at 0

25C

is 24 mm Hg)

(1)

20.76

(2)

23.76

(3)

24.76

(4)

2.376

Key: 2Sol: s0

P=P× mole fraction of ureas

0.1P 2 4 2 . 3 7 62 4 0 . 2 4 2 3 .7 6 0 . 1 1 0

145.At 298 K the molar conductivities at infinite dilution

0m

of 4

NHCl,KOH

and

KCl

are

152.8,272.6

and 2-1

149.8Scmmol

respectively. The 0m

of 4

NHOH

in S 2-1

cmmol

and %dissociation of 0.01 4

M N H O H

with

2-1m

2 5 . 1 c m m o l

S

at the same temperature are

(1)

275.6,9.1

(2)

269.6,9.6

(3)

30,84

(4)

275.6,0.91

Key: 1Sol:

00044

NHOH=NHCl+KOHKClm m m

1 5 2 . 8 2 7 2 . 6 1 4 9 . 8

275.6

0

25.19.1275.6mm

146.In a first order reaction the

concentration of the reactant decreases from 0.6 M to 0.3 M in 15minutes. The time taken for the concentration to change from

0.1M

to

0.025M

in minutes is

( 1 ) 1 2 ( 2 ) 3 0 ( 3 ) 3 ( 4 ) 1 . 2

Key: 2Sol: 12

t 1 5 m i n

0.12.303t 1 5 lo g 3 0 0 .6 9 3 0 . 2 5

147.Assertion (A) : Van der Waals’ are responsible for chemisorptionReason (R) : High temperature is

favourable for chemisorptionThe correct answer is

(1) (A) and (R) are correct and (R) is the correct explanation of (A)(2) (A) and (R) are correct but (R) is not the correct

explanation of (A)(3) (A) is correct but (R) is not correct(4) (A) is not correct but (R) is correctwww.AndhraColleges.com - Eamcet Rank Estimator - Mock Counselling - Cutoff Ranks

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Key: 4Sol:

Conceptual

148.What is the role of limestone during the extraction of iron from haematite ore ?

( 1 ) o x i d i z i n g a g e n t ( 2 ) r e d u c i n g a g e n t ( 3 )

f l u x ( 4 ) l e a c h i n g a g e n t

Key: 3Sol:

Conceptual

149.The charring of sugar takes place

when treated with concentrated 24

H S O .

What is the type of reaction involved in it ?

( 1 ) H y d r o l y s i s

r e a c t i o n ( 2 ) A d d i t i o n r e a c t i o n ( 3 ) D i s p r o p o r t i o n a ti o n r e a c t i o n ( 4 ) D e h y d r a t i o n r e a c t i o n

Key: 4Sol:

Conceptual

150.The structure of 4

XeOF

is

( 1 ) S q u a r e p l a n a r ( 2 ) S q u a r e p y r a m i d a l ( 3 ) P y r a m i d a l ( 4 )

T r i g o n a l b i p y r a m i d a l

Key: 2Sol:

Structure

of 4

XeOF

151.Which one of the following ions has same number of unpaired electrons as those present in 3+

V

ion ?

(1)

2

Ni

(2) 2

Mn

(3) 3

Cr

(4) 3

Fe

Key: 1Sol: + 3 2 0

V = 3 d 4 s

+80

Ni=3d4s

152Match the followingL i s t - I L i s t

- I I (A) sp3

(I)

336

C o N H

(B) dsp3

(II)

4

NiCo

(C) sp3

d2

(III)

322

P t N H C l

(D) d2

sp3

(IV)

36

CoF

(V)

5

F e C o

( A )( B )( C )( D ) 1 )( V ) ( I I )( I V )( I I I ) 2 )( I I )( I I I )

( I V )( I ) 3 )( I I )( I I I )( I )( V ) 4 )( I I I )( I I )( I V ) ( I )

Key: 2Sol:

Conceptualwww.AndhraColleges.com - Eamcet Rank Estimator - Mock Counselling - Cutoff Ranks

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153.Identify the corpolymer from the following:

1) [22

C F C F ]

n

2)

[22

Cl

C H C C H C H ]

n

3) [2

Cl

C H C H ]

n

4) [222

H56

C

C H C H C H C HC H C H ]

n

Key: 4Sol:

Conceptual

154.Lactose is a disaccharide of ________

1)

D G l u c o s e a n d DG a l a c t o s e

2)

D G l u c o s e a n d DR i b o s e

3)

D G l u c o s e a n d DG a l a c t o s e

4)

D G l u c o s e a n d DF r u c t o s e

Key: 1Sol:

Conceptual

155.What are the substances which mimic the natural

chemical messengers?

1 ) A n t a g o n i s t s2 ) A g o n i s t s 3 ) R e c e p t o r s 4 ) A n t i b i o t i c s

Key: 2Sol:

Conceptual

156.Which one of the following is more readily hydrolysed by SN

1 mechanism?

1) 652

C H C H B r 2 )

653

C H C H C H B r

3)

652

C H C H B r

4)

6532

C H C C H B r

Key: 4Sol:

Conceptual

157.

HI6 5 2 3

C H O C H CH Y Z

Identify Y and Z in the above reaction:YZ

1) 25

CHI65

C H C H O 2) 65

CHI32

H C C H O H 3) 65

C H O H32

H C C H I 4) 65

C H O H33

H C C H

Key: 3Sol: HI6 5 2

3 6 5 32

Δ

C H O C H C HC H O H + H CC H I

158.Y

X B e n z o q u i n o ne

Indetify X and Y in the above reaction:

XY1)

2 2 7 2 4

NaCrO/HSO2) 2 2 7 2 4

NaCrO/HSO3) Zn4) Znwww.AndhraColleges.com - Eamcet Rank Estimator - Mock Counselling - Cutoff Ranks

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Key: 1Sol:

OH O2 5 7 2 4

NaCrOHSO

O

159.3

HODryether 32

H C M g Br C O Y Z

Identify Z from the following:

1 ) A c e t i c a c i d 2 ) P r o p a n i c a c i d 3 ) M e t h y l a c e t a t e 4 ) E t h y l a c e t a t e

Key: 1Sol:

3

dryether 3 23 3

C H M g B r + C OO O H O

C H C O C H C O H

160.What is Z in the following reaction sequence?652

23223

i ) N a N O H C l / 2 7 3 K i i ) H P O H O iii)CO,HCl;anhydrousAlCl/CuCl

C HN HZ

1) 65

C H O H 2 ) 65

C H C H O 3) 66

C H 4 ) 652

C H C O H

Key: 2Sol: 322232

H P O + H O NaNO,HCl,275KCO,HCl+-6 5 2

6 5 26 6 65 AnhydrousAlClCuCl

C H N HC H -N C l C HC H -C H O

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