Chemistry | Study Mode

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Question 21
A
Hydrolysis
B
crystallization
C
chromatography
D
sublimation
Explanation
Chromatography is a separation technique used to separate component, mostly coloured, depending on their rate of
migration

Correct option: C
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Question 22
A
Atomic mass of elements increase
B
Electro positive character of elements increase
C
Atomic number of element increases
D
Number of electrons in the outermost orbits of elements increases
Explanation
Although electropositivity decreases across the period, while electronegativity increase (B)

Correct option: B
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Question 23
A

8.0g

B

0.04g

C

0.4g

D

1.0g (GMV = 22.4dm3)

Explanation

M + 2HCI → MCI2 + H2
1 mole: 2 mole 1mole : 1mole
No. of mole = 0.224.m4
22.4dm
= 0.01 mole of hydrogen gas
Since 1 mole of H2 is liberated by 1mole of M 0.0lmole of H2 will liberate 1mole of M Mass of M = 40x0.01 = 0.4g (C)


Correct option: C
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Question 24
A
NaHSO2
B
Na2SO4
C
CH3COONa
D
Na2S
Explanation
Acid salt are produced as a result of incomplete displacement of hydrogen, e. g. NaHSO4, NaHCO3 (A)

Correct option: A
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Question 25
A
Electrovalent with a valency of the
B
Electrovalent with a valency of 2
C
Covalent with a valency of 2
D
Covalent with a valency of 4
Explanation
An element with atomic number 12 is metallic divalent and a reducing agent, ionize by losing 2 electrons to combine with
non-metals to form electrovalent bond (B)

Correct option: B
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Question 26
A

10cm

B

20cm

C

50cm

D

100cm

Explanation

Oxygen is 21% of oxygen
% oxygen = Vol of oxygen x 100
Total Vol of air
21%= 10cm3 x 100
Total volume of air
Total vol. of air = (10cm3 x 100%) /21%

=47.61

=50(C)


Correct option: C
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Question 27
A
Zinc and gold
B
lead and manganese
C
nickel and silver
D
manganese and magnesium
Explanation
Duralumin is an alloy of aluminium. copper, magnesium and manganese (D)

Correct option: D
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Question 28
A
lead
B
zinc
C
aluminium
D
copper
Explanation
Zinc and aluminium readily dissolve in sodium hydroxide to form sodium zincate(II) and sodium aluminate(III),
respectively. Sodium hydroxide do not react with lead. Copper, being fairly far down the activity series, has no action with
alkalis (D)

Correct option: D
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Question 29
A
First ionization energy
B
Second ionization energy
C
Electron affinity
D
Electron activity.
Explanation
The first ionization energy is the energy required to remove one electron from each atom is a mole of gaseous atoms,
producing one mole of gaseous ion with a position charge while electron affinity is the ability of an atom in gaseous form to
attract electron toward itself (C)

Correct option: C
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Question 30
A
50cm3
B
10cm3
C
40cm3
D
30cm3
Explanation
2H2 + O2 . 2H2O
Reaction mole 2moles 1mole 2 moles
Reacting atom 50cm2 20cm3 -
Reaction ratio 40cm 20cm 40cm
Residual gas 10cm3 - 40cm3
Residual gas = unreacted hydrogen + formed
water
= 10 + 40 = 50cm (A)

Correct option: A

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