Chemistry Test

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Chemistry Test - 26

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Weekly Quiz Competition

Question 1
3 / -1

Which of the following methods of separation is based on the difference in the solubility of an organic compound and its impurities in a suitable solvent?

A
Recrystallisation

B
Distillation

C
Sublimation

D
Fractional distillation

Solution

Crystallisation is based on the principles of solubility - compounds tend to be more stable in hot liquids than they are in cold liquids.
Question 2
3 / -1

Man-made elements belong to _____ series.

A
actinide

B
lanthanide

C
halogen

D
inert gas

Solution

Out of all the actinides, thorium and uranium occur naturally in substantial, primordial quantities and small amounts of persisting natural plutonium have also been identified. The radioactive decay of uranium produces transient amounts of actinium and protactinium. The atoms of neptunium, americium, curium, berkelium and californium are occasionally produced from transmutation reactions in uranium ores. The other actinides are purely synthetic elements.
Question 3
3 / -1

Which of the following exhibits stereo isomerism?

(a) 1, 2 - dichloroethylene (b) 2 - hydroxy propanoic acid

(c) 1, 1 - dichloroethylene (d) 2 - methyl propane

A
(a) and (d)

B
(b) and (d)

C
(a) and (b)

D
(c) and (d)

Solution

1,2-dichloroethylene (Cl)HC=CH(Cl) shows cis-trans isomerism whereas 2-hydroxy propanoic acid (CH3CH(OH)COOH) shows optical activity.
Question 4
3 / -1

Starch is converted to ethanol by fermentation. What is the sequence of enzymes used?

A
Amylase, maltase, zymase

B
Diastase, maltase, zymase

C
Amylase, invertase, zymase

D
Amylase, zymase, maltase

Solution

During fermentation of starch, it is first hydrolyzed to maltose by the action of the enzyme diastase.

The enzyme diastase is obtained from germinated barley seeds. Maltose is converted to glucose by the enzyme maltase. Glucose is converted to ethanol by another enzyme, zymase.
Question 5
3 / -1

Lanthanides are

A
14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sub-level

B
14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sub-level

C
14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sub-level

D
14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sub-level

Solution

The lanthanide series comprises the fifteen metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. These fifteen elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.
Question 6
3 / -1

How many asymmetric carbon atoms are present in 2,3,4-trichloropentane?

A
1

B
2

C
3

D
4

Solution

2,3,4-trichloropentane has 3 asymmetric carbon atoms.
Question 7
3 / -1

Which of the following statements is correct?

A
Among alkali metals, the reactivity increases down the group, but among halogens it decreases with increase in atomic number down the group.

B
Among alkali metals, the reactivity decreases down the group, but among halogens it increases with increase in atomic number down the group.

C
In both alkali metals and halogens, the reactivity decreases with increase in atomic number down the group.

D
In both alkali metals and halogens, the reactivity increases with increase in atomic number down the group.

Solution

Alkali metals are electropositive and have a tendency to lose electrons. On moving down the group, the ionisation energy decreases and metallic character increases.

Halogens react by accepting the electrons. On moving down the group, the tendency to accept an electron decreases due to decrease in electronegativity. Therefore, the reactivity decreases down the group.
Question 8
3 / -1

Which of the following elements is not an ore of magnesium?

A
Magnesite

B
Dolomite

C
Gypsum

D
Carnallite

Solution

Magnesite = MgCO₃

Dolomite = CaMg(CO₃)₂

Gypsum = CaSO₄·2H₂O

Carnallite = KMgCl₃·6(H₂O)
Question 9
3 / -1

Which of the following reagents cannot be used to identify nickel ion?

A
Resorcinol

B
Dimethyl glyoxime

C
Diphenyl benzidine

D
Potassium ferrocynide

Solution

Besides diphenyl benzidine, all other chemicals can be used to identify nickel ion.
Question 10
3 / -1

Propyne and propene can be distinguished by

A
conc H₂SO₄

B
Br₂ in CCl₄

C
alkaline KMnO₄

D
AgNO₃ in NH₃

Solution

Propyne and propane both are unsaturated compounds and give the tests of unsaturation. Both will react with conc. H₂SO₄, decolourise Br₂ in CCl₄ and il. KMnO₄ solution. Only propyne (which is an alkyne) will give a white precipitate with ammoniacal AgNO₃.

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Chemistry Test - 26

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Chemistry Test - 26

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Question 1

Recrystallisation

Distillation

Sublimation

Fractional distillation

Solution

Question 2

actinide

lanthanide

halogen

inert gas

Solution

Question 3

(a) and (d)

(b) and (d)

(a) and (b)

(c) and (d)

Solution

Question 4

Amylase, maltase, zymase

Diastase, maltase, zymase

Amylase, invertase, zymase

Amylase, zymase, maltase

Solution

Question 5

14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sub-level

14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sub-level

14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sub-level

14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sub-level

Solution

Question 6

1

2

3

4

Solution

Question 7

Among alkali metals, the reactivity increases down the group, but among halogens it decreases with increase in atomic number down the group.

Among alkali metals, the reactivity decreases down the group, but among halogens it increases with increase in atomic number down the group.

In both alkali metals and halogens, the reactivity decreases with increase in atomic number down the group.

In both alkali metals and halogens, the reactivity increases with increase in atomic number down the group.

Solution

Question 8

Magnesite

Dolomite

Gypsum

Carnallite

Solution

Question 9

Resorcinol

Dimethyl glyoxime

Diphenyl benzidine

Potassium ferrocynide

Solution

Question 10

conc H2SO4

Br2 in CCl4

alkaline KMnO4

AgNO3 in NH3

Solution

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conc H₂SO₄

Br₂ in CCl₄

alkaline KMnO₄

AgNO₃ in NH₃