Chemistry Test

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Chemistry Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

R₁ is the rate of a simple reaction, 2NO + O₂ 2NO₂.

If the volume of the reaction vessel is doubled, the rate of the reaction becomes

A
(1/8)R₁

B
8R₁

C
R₁

D
(1/2)R₁

Solution

This option is correct because rate \(=\mathrm{K}[\mathrm{NO}]^{2}\left[\mathrm{O}_{2}\right]\)
Order of the reaction \(=2+1=3\)
When volume is doubled, the concentration of each species will be halved.
Hence, \(R_{2}=\frac{1}{2^{3}}=\frac{1}{8}\)
Question 2
4 / -1

Alkyl halides, on treatment with a suspension of Ag₂O (dry), give

A
alkanals

B
alkanols

C
alkanes

D
alkoxy alkanes

Solution

With dry \(\mathrm{Ag}_{2} \mathrm{O}\), alkyl halides give alkoxy alkanes.
\(\mathrm{RX}+\mathrm{Ag}_{2} \mathrm{O}(\mathrm{dry}) \rightarrow \mathrm{ROR}+2 \mathrm{Ag} \mathrm{X}\)
For example:
\(2 \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}+\mathrm{Ag}_{2} \mathrm{O} \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OC}_{2} \mathrm{H}_{5}+2 \mathrm{AgCl}\)
It will give alcohol with moist \(\mathrm{Ag}_{2} \mathrm{O}\).
\[
\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}+\mathrm{AgOH} \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{AgCl}
\]
Question 3
4 / -1

The various processes, involved in the extraction of metals from their ores and refining, are known as

A
metallurgy

B
cosmology

C
chemotherapy

D
None of these

Solution

The Process of Extraction of Metals from their Ores and refining them is known as Metallurgy.
Question 4
4 / -1

Berthelot’s synthesis is used for the manufacture of

A
methane

B
ethane

C
ethylene

D
acetylene

Solution

Berthelot synthesised acetylene gas, which he named although it had been discovered earlier, by passing hydrogen through an electric arc produced with carbon poles.
Question 5
4 / -1

Directions: The following question has four choices out of which ONLY ONE is correct.

The molecular formula of chloropicrin is

A
CHCl₃NO₂

B
CCl₃NO₃

C
CCl₂NO₂

D
CCl₃NO₂

Solution

Chloropicrin, also known as PS and nitrochloroform, is a chemical compound with the structural formula Cl₃CNO₂.
Question 6
4 / -1

Photochemical smog can be suppressed by

A
nitrogen oxides

B
peroxyacetyl nitrate

C
radical traps

D
formaldehyde

Solution

Photochemical smog can be suppressed by certain compounds, which act as free radical traps and also by installation of efficient catalytic converters in automobiles.
Question 7
4 / -1

Which of the following statements is correct about potassium permanganate?

A
It acts as strong reducing agent.

B
It is not suitable to be used in volumetric analysis.

C
It is used as a disinfectant

D
In it, four oxygen atoms are arranged in square planar arrangment.

Solution

Potassium permanganate is also widely used as a disinfectant and germicide.
Question 8
4 / -1

Fluorobenzene (C₆H₅F) can be synthesised in the laboratory

A
by heating phenol with HF and KF

B
from aniline by diazotisation, followed by heating the diazonium salt with HBF₄

C
by direct fluorination of benzene with F₂gas

D
by reacting bromobenzene with NaF solution

Solution

Flurobenzene can be synthesised from aniline by diazotisation, followed by heating the diazonium salt with HBF₄.
Question 9
4 / -1

Addition of HCl to vinyl chloride gives 1,1–dichloroethane because of

A
inductive effect of Cl

B
restricted rotation around the double bond

C
mesomeric effect of Cl

D
None of these

Solution

During the addition of HCl to vinyl chloride carbocation is formed as an intermediate which is stabilised by mesomeric effect of Cl^-.
Question 10
4 / -1

Reaction of ethyl acetate with excess of CH3MgI followed by hydrolysis gives

A
n - propyl alcohol

B
ethanal

C
propanal

D
tert-Butyl alcohol

Solution

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Chemistry Test - 24

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Chemistry Test - 24

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Question 1

(1/8)R1

8R1

R1

(1/2)R1

Solution

Question 2

alkanals

alkanols

alkanes

alkoxy alkanes

Solution

Question 3

metallurgy

cosmology

chemotherapy

None of these

Solution

Question 4

methane

ethane

ethylene

acetylene

Solution

Question 5

CHCl3NO2

CCl3NO3

CCl2NO2

CCl3NO2

Solution

Question 6

nitrogen oxides

peroxyacetyl nitrate

radical traps

formaldehyde

Solution

Question 7

It acts as strong reducing agent.

It is not suitable to be used in volumetric analysis.

It is used as a disinfectant

In it, four oxygen atoms are arranged in square planar arrangment.

Solution

Question 8

by heating phenol with HF and KF

from aniline by diazotisation, followed by heating the diazonium salt with HBF4

by direct fluorination of benzene with F2 gas

by reacting bromobenzene with NaF solution

Solution

Question 9

inductive effect of Cl

restricted rotation around the double bond

mesomeric effect of Cl

None of these

Solution

Question 10

n - propyl alcohol

ethanal

propanal

tert-Butyl alcohol

Solution

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(1/8)R₁

8R₁

R₁

(1/2)R₁

CHCl₃NO₂

CCl₃NO₃

CCl₂NO₂

CCl₃NO₂

from aniline by diazotisation, followed by heating the diazonium salt with HBF₄

by direct fluorination of benzene with F₂gas