Chemistry Test

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Chemistry Test - 23

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following does not give iodoform test?

A
HCHO

B
CH₃CHO

C
CH₃COCH₃

D
C₂H₅OH

Solution

lodoform test is shown by a compound \(\mathrm{CH}, \mathrm{CO}-\) group or by a compound which produces this group. Methanal \((\mathrm{HCHO})\) does not show iodoform test.
Question 2
4 / -1

What is the number of isomeric primary amines obtained from C₄H₁₁N?

A
3

B
4

C
5

D
6

Solution

The following isomeric \(1^{\circ}\) amines can be obtained from \(\mathrm{C}_{4} \mathrm{H}_{11} \mathrm{N}\)

(i) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\)
Question 3
4 / -1

Which of the following is a repeating unit of synthetic rubber?

A
PVC

B
Chloroprene

C
Neoprene

D
Vinyl cyanide

Solution

Synthetic rubber can be made from the polymerization of a variety of monomers including isoprene (2-methyl-1,3-butadiene), 1,3-butadiene, chloroprene (2-chloro-1,3-butadiene), and isobutylene (methylpropene) with a small percentage of isoprene for cross-linking.
Question 4
4 / -1

Slag is represented by

A
CaSiO₃

B
SiO₃

C
Ca(OH)₂

D
CaO

Solution

Slag is a partially vitreous by-product of smelting ore to separate the metal fraction from the unwanted fraction. It can usually be considered as a mixture of metal oxides and silicon dioxide. So, CaSiO₃ is known as slag.
Question 5
4 / -1

Which of the following is not a part of the biotic environment?

A
Man

B
Air

C
Tree

D
Insect

Solution

Air is not a part of the biotic environment.
Question 6
4 / -1

In the reaction \(2 \mathrm{N}_{2} \mathrm{O}_{5} \rightarrow 4 \mathrm{NO}_{2}+\mathrm{O}_{2}\)
\(\mathrm{NO}_{2}\) is being formed at the rate of \(0.0072 \mathrm{mol} \mathrm{L}^{-1} \mathrm{s}^{-1}\)
If the reaction follows second order kinetics, what is the rate of the reaction when the concentration of \(\mathrm{N}_{2} \mathrm{O}_{5}\)
is douled?

A
0.0072 mol L^-1 s^-1

B
0.0288 mol L^-1s^-1

C
0.0072 mol L^-1s^-1

D
0.0144 mol L^-1 s^-1

Solution

According to the balanced equation:
Rate of the reaction \(=\frac{1}{4}\) rate of formation of \(\mathrm{NO}_{2}\) Therefore rate of the reaction \(=\frac{1}{4} \times 0.0072 \mathrm{mol} \mathrm{L}^{-1} \mathrm{s}^{-1}\)
since the reaction is of second order, the rate of decomposition becomes 4 times when \(\left[\mathrm{N}_{2} \mathrm{O}_{5}\right]\)
is doubled. Therefore the rate of reaction is \(=4 \times \frac{1}{4} \times 0.0072=0.0072 \mathrm{molL}^{-1} \mathrm{s}^{-1}\)
Question 7
4 / -1

The rate constants were found to be K₁and K₂, when a reaction was carried out at 310 K and 290 K respectively.

The two rate constants are related as:

A
K₂ = 0.25 K₁

B
K₂ = 4 K₁

C
K₁ = 2 K₂

D
K₂ = 2 K₁

Solution

This option is correct because for every 10 degree rise in temprature, rate constant doubles.

Aince, T₁ = T₂ + 20

Hence, K₁ = 4 K₂

=> K₂ = 0.25 K₁

Hence, this option is correct.
Question 8
4 / -1

C-H bond energy is about 101 kcal/mol for methane, ethane and other alkanes, but is only 77 kcal/mol for C-H bond of CH₃ in toluene. This is because

A
of inductive effect due to – CH₃ in toluene

B
of the presence of benzene ring in toluene

C
of resonance among the structures of benzyl radical in toluene

D
of aromaticity of toluene

Solution

The C- H bond-dissociation energy is about 101 kcal/mole for methane, ethane, and other alkanes, but is only 77 kcal/mole for toluene, as determined by Szware from its rate of pyrolysis and by Schissler and Stevenson by electron impact. The difference, 24 kcal/mole, can be attributed to the resonance stabilization of the benzyl radical that is produced by removing one hydrogen atom from the methyl group of toluene; this radical resonates among the several structures.
Question 9
4 / -1

The best method to separate the mixture of ortho and para nitrophenol (1 : 1) is

A
vapourisation

B
colour spectrum

C
distillation

D
crystallisation

Solution

Ortho and para nitrophenol is separated by distillation beacuse \(p\) -nitrophenol has higher boiling point than \(o\) -nitrophenol due to H-bonding.
Question 10
4 / -1

Which of the following covalent bonds has the highest ionic character?

A
H-Cl

B
H-NH₂

C
H-OH

D
H-SH

Solution

Among the given options, the difference in electronegativity between the H and O is the highest. So, this bond will have the highest ionic character.

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Chemistry Test - 23

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Chemistry Test - 23

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Question 1

HCHO

CH3CHO

CH3COCH3

C2H5OH

Solution

Question 2

3

4

5

6

Solution

Question 3

PVC

Chloroprene

Neoprene

Vinyl cyanide

Solution

Question 4

CaSiO3

SiO3

Ca(OH)2

CaO

Solution

Question 5

Man

Air

Tree

Insect

Solution

Question 6

0.0072 mol L-1 s-1

0.0288 mol L-1 s-1

0.0072 mol L-1 s-1

0.0144 mol L-1 s-1

Solution

Question 7

K2 = 0.25 K1

K2 = 4 K1

K1 = 2 K2

K2 = 2 K1

Solution

Question 8

of inductive effect due to – CH3 in toluene

of the presence of benzene ring in toluene

of resonance among the structures of benzyl radical in toluene

of aromaticity of toluene

Solution

Question 9

vapourisation

colour spectrum

distillation

crystallisation

Solution

Question 10

H-Cl

H-NH2

H-OH

H-SH

Solution

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CH₃CHO

CH₃COCH₃

C₂H₅OH

CaSiO₃

SiO₃

Ca(OH)₂

0.0072 mol L^-1 s^-1

0.0288 mol L^-1s^-1

0.0072 mol L^-1s^-1

0.0144 mol L^-1 s^-1

K₂ = 0.25 K₁

K₂ = 4 K₁

K₁ = 2 K₂

K₂ = 2 K₁

of inductive effect due to – CH₃ in toluene

H-NH₂