Chemistry Test

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Chemistry Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

The concentration of reactant changes from 0.06 mol L^-1to 0.05 mol L^-1 in 25 minutes. Calculate the average rate of reaction.

A
4 x 10^-4mol L^-1min^-1

B
- 4 x 10^-4mol L^-1 min^-1

C
0.04 mol L^-1 min^-1

D
- 0.04 mol L^-1 min^-1

Solution

This option is correct because, rate of reaction is given by, Rate = - (change in concentration of reactants) / time. ( 0.06 - 0.05) / 25 = 4 x 10^-4 mol L^-1 min ^-1. Hence this option is correct.
Question 2
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 3
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 4
4 / -1

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 5
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 CH,CO− group or by a compound which produces this group. Methanal (HCHO) does not show iodoform test.
Question 6
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∘ amines can be obtained from C4H11N

(i)
Question 7
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 8
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 9
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 10
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.

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Chemistry Test - 3

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Chemistry Test - 3

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Question 1

4 x 10-4mol L-1min-1

- 4 x 10-4 mol L-1 min-1

0.04 mol L-1 min-1

- 0.04 mol L-1 min-1

Solution

This option is correct because, rate of reaction is given by, Rate = - (change in concentration of reactants) / time. ( 0.06 - 0.05) / 25 = 4 x 10-4 mol L-1 min -1. Hence this option is correct.

Question 2

nitrogen oxides

peroxyacetyl nitrate

radical traps

formaldehyde

Solution

Question 3

methane

ethane

ethylene

acetylene

Solution

Question 4

CHCl3NO2

CCl3NO3

CCl2NO2

CCl3NO2

Solution

Question 5

HCHO

CH3CHO

CH3COCH3

C2H5OH

Solution

Question 6

3

4

5

6

Solution

Question 7

metallurgy

cosmology

chemotherapy

None of these

Solution

Question 8

CaSiO3

SiO3

Ca(OH)2

CaO

Solution

Question 9

K2 = 0.25 K1

K2 = 4 K1

K1 = 2 K2

K2 = 2 K1

Solution

Question 10

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

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4 x 10^-4mol L^-1min^-1

- 4 x 10^-4mol L^-1 min^-1

0.04 mol L^-1 min^-1

- 0.04 mol L^-1 min^-1

This option is correct because, rate of reaction is given by, Rate = - (change in concentration of reactants) / time. ( 0.06 - 0.05) / 25 = 4 x 10^-4 mol L^-1 min ^-1. Hence this option is correct.

CHCl₃NO₂

CCl₃NO₃

CCl₂NO₂

CCl₃NO₂

CH₃CHO

CH₃COCH₃

C₂H₅OH

CaSiO₃

SiO₃

Ca(OH)₂

K₂ = 0.25 K₁

K₂ = 4 K₁

K₁ = 2 K₂

K₂ = 2 K₁