Askiitians Chemistry Test207 Solutions

8/13/2019 Askiitians Chemistry Test207 Solutions

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Solutions

Code - AC207SECTION I

1. (b)

400 =

c = 20 105

N

BaSO 4 Ba 2+ + SO 4 2

Ksp = s 2 = = 1 10 8 M2 /L 2

2. (c)

P =

3. (d)

V = 3L T = 300 K

P = 0.2 atm

PV = RT

= 0.02436

Moles of NH 3 = equivalents of NH 3


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= 0.02436

Milliequivalents of NH 3 = 1000 0.02436

= 24.36

= N 134

= 0.18.

4. (b)

400 =

c = 20 10 5 N

BaSO 4 Ba 2+ + SO 4 2

Ksp = s 2 = = 1 10 8 M2 /L 2

5. (a)

m =

Tf = K f m = 0.62 oC

Freezing Point = 0 0.32 = 0.62 oC

6. (c)

Rate =


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Ratio is 1 : 1.25.

7. (c)

CH bond in allylic position is weakest because the allylic free radical isthe most stable. Bond between H and sp carbon is stronger than thebond between H and sp3 carbon.

> 8 > .

8. (b)

Aqueous ethanol is a protic solvent while the DMSO is aprotic solvent.The attacking nucleophile is solvated in protic solvent and leastsolvated in aprotic solvent. So, in DMSO, the S N2 substitution takesplace at a faster rate with higher yield.

9. (a)

In exothermic reaction,

Energy of Product < Energy of reactant

SECTION II

1. C

No rearrangement akes place

2. a

3. b

4. d

SECTION III

Paragraph


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1. (a)

The base present in DNA is adenine which is held with thyamine usingtwo hydrogen bonds.

2. (b)

Adenosine is an example of nucleoside, made up of adenine (base) andribose (sugar moiety).

3. (c)

Guanine is not a pyrimidine base. It is actually a purine base.

Paragraph

1. (d)

NF3 is not hydrolysed due to lack of vacant d orbitals in N and F. PF 3 &PF5 are not hydrolysed because P F bond is stronger than P Ocovalent bonds. Hence, NF 3 , PF 3 , and PF 6 are not hydrolyzed.

2. (d)

F F F

Electron densityof N is decreased

due to high

electronegativity fluorine.

3. (b)

The difference in electronegativities of N and F is lowest, hence NF 3 isleast ionic.


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The electronegativity difference between Bi and Cl is maximum.Hence, BiCl 3 is most ionic.

SECTION IV

1. a r

b r

c p

d q

2. a rb q, s

c p

d q

3. a r

b p

c s

d q

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Askiitians Chemistry Test207 Solutions