Chemistry Test

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Chemistry Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

Isocyanide can be prepared from alkyl halide on treatment with

A
KNC

B
AgNC

C
KCN

D
AgCN

Solution

Following reaction takes place in this case:
\(\mathrm{CH}_{3} \mathrm{I}+\mathrm{AgCN} \rightarrow \mathrm{CH}_{3} \mathrm{NC}+\mathrm{Agl}\)
Question 2
4 / -1

Acrylonitrile is formed by the reaction of

A
acrylic acid and KCN

B
ethyne and KCN

C
ethyne and HCN/Ba²⁺

D
ethyne and HOCl

Solution

Acrylonitrile is formed by the reaction of acetylene with \(\mathrm{HCN}\) in the presence of \(\mathrm{Ba}^{2+}\) ions.

The other reactions are expected to proceed as follows:
\[
C H_{2}=C H-C O O H+K C N \rightarrow C H_{2}=C H-C O O K+H C N
\]
\(C H \equiv C H+K C N \rightarrow C H_{2}=C H K+H C N\)
\(C H_{2} \equiv C H_{2}+H O C l \rightarrow(O H) C H=C H C l \quad \frac{\text { tautomeriation }}{\longrightarrow} H O C-C H_{2} C l\)
Question 3
4 / -1

Thermite is a mixture of

A
CrO₃ and Al₂O₃

B
Fe₂O₃ and Al

C
Fe₂O₃and Al₂O₃

D
Al₂O₃ and Cr

Solution

Thermite is a pyrotechnic composition of metal powder and metal oxide that produces an exothermic oxidation-reduction reaction known as a thermite reaction. The most commonly used mixture is of iron oxide and aluminium.
Question 4
4 / -1

Formation of terylene is an example of

A
condensation polymerisation

B
addition polymerisation

C
esterification

D
saponification

Solution

Terylene (a polyester) is formed by condensation polymerization and the structure of Terylene represented as

This is the same kind of 'ester linkage' (-COOC-) found in fats which are combination of long chain fatty carboxylic acids and glycerol (alcohol with 3 -OH groups, a 'triol').
Question 5
4 / -1

For synthesis of 1-butene, CH3MgI should be treated with

A
propene

B
2-chloropropene

C
allyl chloride

D
ethyl chloride

Solution

Alkenes can be prepared by the reaction of grignard reagent with unsaturated alkyl haildes.
Question 6
4 / -1

If an alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be

A
a primary amine

B
a secondary amine

C
a tertiary amine

D
a mixture of all the three

Solution

In this case, the product will be a mixture of primary, secondary and tertiary amines.
Question 7
4 / -1

Which of the following elements is present in teflon?

A
C

B
Cl

C
F

D
Br

Solution

Fluorine is present in teflon. Teflon has the following structure:
Question 8
4 / -1

In the nuclear fusion reaction \({ }_{1}^{2} \mathrm{H}+{ }_{1}^{2} \mathrm{H} \rightarrow{ }_{2}^{4}\) He, the masses of \({ }_{1}^{2} \mathrm{H}\) and \({ }_{2}^{4}\) He are 2.014 amu and 4.003 amu,
respectively. The energy released per atom of helium formed is meV.

A
16.761

B
26.383

C
13.260

D
23.484

Solution

Mass of 2 deuterium nuclei \(=2 \times 2.014=4.028 \mathrm{amu}\)
Mass of one helium nucleus formed \(=4.003\) amu
\[
\Delta m=4.028-4.003=0.025 \mathrm{amu}
\]
Energy evolved in the reactior \(E=\Delta m c^{2}\)
\[
E=\frac{0.025 \times 1.67 \times 10^{-27} \times 9 \times 10^{16}}{1.6 \times 10^{-19} \times 10^{6}}
\]
\(E=23.484 \mathrm{MeV}\)
Question 9
4 / -1

5A→ 2B
If there were 1.5 moles of 'A' 2 L solution in the beginning of the reaction, what is the concentration of 'B' when 'A' is 20% consumed?

A
0.75 M

B
0.06 M

C
0.15 M

D
0.03 M

Solution

Rate \(=-\frac{1}{5} \frac{d[A]}{d t}=\frac{1}{2} \frac{d[B]}{d t}\)
Hence,\(\frac{d[B]}{d t}=-\frac{2}{5} \frac{d[A]}{d t}\)
Initial \([\mathrm{A}]=\frac{1.5}{2}=0.75 M\)
\(\left[\right.\) A] consumed \(=\frac{20}{100} \times 0.75=0.15 M\)
since, the rate of appearance of \(B\) is \(\frac{2^{t h}}{5}\) of the rate of disappearance of \(A\) \([\mathrm{B}]_{\mathrm{t}}=\frac{2}{5} \times 0.15=0.06 M\)
Question 10
4 / -1

Which of the following reacts with phenol to give salicylaldehyde after hydrolysis?

A
Dichloro methane

B
Trichloro methane

C
Methyl chloride

D
None of these

Solution

This is an example of Reimer Tiemann reaction.

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Chemistry Test - 21

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Chemistry Test - 21

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Question 1

KNC

AgNC

KCN

AgCN

Solution

Question 2

acrylic acid and KCN

ethyne and KCN

ethyne and HCN/Ba2+

ethyne and HOCl

Solution

Question 3

CrO3 and Al2O3

Fe2O3 and Al

Fe2O3 and Al2O3

Al2O3 and Cr

Solution

Question 4

condensation polymerisation

addition polymerisation

esterification

saponification

Solution

Question 5

propene

2-chloropropene

allyl chloride

ethyl chloride

Solution

Question 6

a primary amine

a secondary amine

a tertiary amine

a mixture of all the three

Solution

Question 7

C

Cl

F

Br

Solution

Question 8

16.761

26.383

13.260

23.484

Solution

Question 9

0.75 M

0.06 M

0.15 M

0.03 M

Solution

Question 10

Dichloro methane

Trichloro methane

Methyl chloride

None of these

Solution

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ethyne and HCN/Ba²⁺

CrO₃ and Al₂O₃

Fe₂O₃ and Al

Fe₂O₃and Al₂O₃

Al₂O₃ and Cr