Chemistry Test

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Chemistry Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Coordination number for body centered cubic is

A
2

B
4

C
6

D
8
Question 2
1 / -0

Which one of the following is NOT applicable to chemisorption?

A
Its heat of adsorption is high

B
It takes place at high temperature

C
It is reversible

D
It forms mono-molecular layers
Question 3
1 / -0

Lyophilic colloids are stable due to

A
small size of the particle

B
large size of the particle

C
layer of dispersion medium on the particle

D
high Tyndall effect
Question 4
1 / -0

IUPAC name for the following compound is

A
2-bromo-1-fluoro-4-nitrobenzene

B
3-bromo-4-fluoro-1-nitrobenzene

C
2-fluoro-5-nitro-1-bromobenzene

D
1-bromo-6-fluoro-3-nitrobenzene
Question 5
1 / -0

Dumas method is preferred over Kjeldahl's method for determining nitrogen quantitatively in

A
explosives such as trinitrotoluene

B
aminoacids

C
amides

D
compounds containing both sulfur and nitrogen
Question 6
1 / -0

Pick the statement that is NOT true for a pair of cis and trans isomers such as 1,2-diphenylethene (stilbene).

A
trans isomer has a higher melting point

B
trans isomer has higher heat of combustion

C
trans isomer has a higher retardation factor (Rf ) in adsorption chromatography over silica gel

D
planarity is better maintained in the trans isomer
Question 7
1 / -0

How will you selectively convert 2-bromopropane to 1-bromopropane?

A
Treatment with alcoholic potassium chloride followed by reaction with HBr

B
Reaction with metallic sodium followed by reaction with bromine

C
Reaction with magnesium metal followed by treatment with HOBr

D
Reaction with alcoholic potassium hydroxide followed by heating with HBr in the presence of benzoyl peroxide.
Question 8
1 / -0

Pick the WRONG statement about propyne.

A
Addition of excess HBr to propyne gives 1,2-dibromopropane

B
It is less acidic than acetylene

C
Upon reaction with dilute sulfuric acid in the presence of mercuric sulfate, it gives acetone as the major product

D
It reacts with sodamide (NaNH2 ) to give sodium propynide
Question 9
1 / -0

In aromatic electrophilic substitution reactions carried out under kinetically controlled conditions

A
all activating groups are meta orienting

B
all deactivating groups are ortho-para orienting

C
all deactivating groups are meta orienting

D
deactivating groups possessing unshared pair of electrons on atoms directly attached to aromatic ring are ortho-para orienting
Question 10
1 / -0

Compounds possessing certain distinct structural features give a yellow precipitate of iodoform on reacting with iodine in the presence of a base. This question is based on the ability of alcohols having no other functional groups to undergo iodoform reaction. Pick the WRONG statement.

A
Ethanol is the only primary alcohol that gives a positive iodoform test

B
Several secondary alcohols give positive iodoform test

C
All tertiary alcohols test negative for iodoform reaction

D
All alcohols test negative for iodoform reaction

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Chemistry Test - 2

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Chemistry Test - 2

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Question 1

2

4

6

8

Question 2

Its heat of adsorption is high

It takes place at high temperature

It is reversible

It forms mono-molecular layers

Question 3

small size of the particle

large size of the particle

layer of dispersion medium on the particle

high Tyndall effect

Question 4

2-bromo-1-fluoro-4-nitrobenzene

3-bromo-4-fluoro-1-nitrobenzene

2-fluoro-5-nitro-1-bromobenzene

1-bromo-6-fluoro-3-nitrobenzene

Question 5

explosives such as trinitrotoluene

aminoacids

amides

compounds containing both sulfur and nitrogen

Question 6

trans isomer has a higher melting point

trans isomer has higher heat of combustion

trans isomer has a higher retardation factor (Rf ) in adsorption chromatography over silica gel

planarity is better maintained in the trans isomer

Question 7

Treatment with alcoholic potassium chloride followed by reaction with HBr

Reaction with metallic sodium followed by reaction with bromine

Reaction with magnesium metal followed by treatment with HOBr

Reaction with alcoholic potassium hydroxide followed by heating with HBr in the presence of benzoyl peroxide.

Question 8

Addition of excess HBr to propyne gives 1,2-dibromopropane

It is less acidic than acetylene

Upon reaction with dilute sulfuric acid in the presence of mercuric sulfate, it gives acetone as the major product

It reacts with sodamide (NaNH2 ) to give sodium propynide

Question 9

all activating groups are meta orienting

all deactivating groups are ortho-para orienting

all deactivating groups are meta orienting

deactivating groups possessing unshared pair of electrons on atoms directly attached to aromatic ring are ortho-para orienting

Question 10

Ethanol is the only primary alcohol that gives a positive iodoform test

Several secondary alcohols give positive iodoform test

All tertiary alcohols test negative for iodoform reaction

All alcohols test negative for iodoform reaction

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