Chemistry Test

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Chemistry Test - 22

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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

Directions: The question consists of two statements: Assertion and Reason. While answering the question, you are required to choose any one of the following four responses.

Assertion: Benzyl bromide, when kept in acetone-water, produces benzyl alcohol.

Reason: The reaction follows SN²mechanism.

A
Both assertion and reason are true and reason is the correct explanation of assertion.

B
Both assertion and reason are true, but reason is not the correct explanation of assertion.

C
Assertion is true, but reason is false.

D
Both assertion and reason are false.

Solution
Question 3
4 / -1

Which of the following is an example of man made ecosystem?

A
Aquarium

B
Pond

C
Forest

D
Lake

Solution

Aquarium is an example of man made ecosystem.
Question 4
4 / -1

Wurtz reaction involves the reduction of alkyl halide with

A
Zn/HCl

B
HI in presence of red phosphorus

C
sodium in ether

D
Zn/Cu couple

Solution

Wurtz reaction involves the reduction of alkyl halide with sodium in ether.
Question 5
4 / -1

The widely used PVC is a polymerised product of

A
CH₂ = CH₂

B
CH₂ = CCl₂

C
CH₂Cl.CH₂Cl

D
CH₂= CHCl

Solution

Polyvinyl chloride is produced by polymerisation of the monomer vinyl chloride (VCM), as shown below.
Question 6
4 / -1

Which of the following group of elements are called chalcophiles?

A
Ni, Co, Os, Ir

B
Se, As, Zn, Cd

C
Rb, Sr, Ba,

D
none of these

Solution

Chalcophile elements concentrate in sulfides, such as Se, As, Zn, Cd.
Question 7
4 / -1

Ethylene is converted to X on passing through a mixture of an acidified aqueous solution of palladium chloride and cupric chloride. Which of the following reagents readily take part in addition reaction with X?

A
Br₂

B
HBr

C
HCl

D
HCN

Solution

Wacker process : This process is used in the preparation of acetaldehyde from ethylene. This process imvolves the treatment of ethylene with an acidified aqueous solution of palladium chloride and cupic chlorideas:

So, the compound' \(X\) ' is acetalden yede. The compound' \(X^{\prime}\) reacts readily with HCN and undergoes addition reaction to give acetaldehydecyanohydrin as:
Question 8
4 / -1

In amino acid synthesis, acetyl chloride is used in the protection of _______ group.

A
cyano

B
amine

C
nitro

D
amide

Solution

Acetyl chloride is a commonly used acetylation agent for the preparation of fine chemicals, agrochemicals and pharmaceuticals. In amino acid synthesis, acetyl chloride can be used to protect amine groups. Acetyl chloride is also used in the production of dyes, the determination of water in organic liquids and in the analysis of cholesterol, lipids and fatty acids.
Question 9
4 / -1

Dacron is a polymer of

A
glycol and formaldehyde

B
glycol and phenol

C
glycol and phthalic acid

D
glycol and terepthalic acid

Solution

Dacron is synthesized by transesterification of two monomers: Ethylene glycol and Dimethyl terephthalate.
Question 10
4 / -1

Which of the following statements correctly represents one of the characteristic of the lanthanides?

A
Most of the their ions are coloured.

B
They have greater tendency towards complex formation.

C
Their compounds are more basic.

D
They are generally non radioactive

Solution

This is correct as except promethium, lanthanides are non radioactive.

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Chemistry Test - 22

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Chemistry Test - 22

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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

Question 2

Both assertion and reason are true and reason is the correct explanation of assertion.

Both assertion and reason are true, but reason is not the correct explanation of assertion.

Assertion is true, but reason is false.

Both assertion and reason are false.

Solution

Question 3

Aquarium

Pond

Forest

Lake

Solution

Question 4

Zn/HCl

HI in presence of red phosphorus

sodium in ether

Zn/Cu couple

Solution

Question 5

CH2 = CH2

CH2 = CCl2

CH2Cl.CH2Cl

CH2 = CHCl

Solution

Question 6

Ni, Co, Os, Ir

Se, As, Zn, Cd

Rb, Sr, Ba,

none of these

Solution

Question 7

Br2

HBr

HCl

HCN

Solution

Question 8

cyano

amine

nitro

amide

Solution

Question 9

glycol and formaldehyde

glycol and phenol

glycol and phthalic acid

glycol and terepthalic acid

Solution

Question 10

Most of the their ions are coloured.

They have greater tendency towards complex formation.

Their compounds are more basic.

They are generally non radioactive

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

CH₂ = CH₂

CH₂ = CCl₂

CH₂Cl.CH₂Cl

CH₂= CHCl

Br₂