Chemistry | Study Mode

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Question 11
A
Losing an electron
B
losing a neutron
C
gaining a neutron
D
gaining an electron
Explanation
E.g. X X + e (loss of electron) (A)

Correct option: A
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Question 12
A
neutralization reaction
B
esterification reaction
C
de esterification reaction
D
hydrolysis reaction
Explanation
The reaction is acid catalysed and reversible produce methylethanoate (ester) in the process called esterification (B)

Correct option: B
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Question 13
A
Calcium
B
Magnesium
C
Aluminium
D
Copper
Explanation
Bauxite (Al2O32H2O) is an ore of aluminium (C)

Correct option: C
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Question 14
A
3 neutrons
B
5 neutrons
C
4 neutrons
D
9 neutrons
Explanation
AZX when A = 17 mass number
X = 8 atomic number
Atomic No. = no. of proton + no. of neutron = 17--8 = 9 (D)

Correct option: D
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Question 15
A
Basic oxide
B
acidic oxide
C
neutral oxide
D
amphoteric oxide
Explanation
Aluminium form oxide called amphoteric. They exhibit both acidic oxide and basic oxide characteristics (D).

Correct option: D
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Question 16
A
Passing each gas through dilute potassium permanganate sodium
B
Pass each gas through ammonical copper 1 chloride solution
C
Passing each through bromide water
D
Treating each gas catalytically with excess hydrogen gas
Explanation
Ethylene (C2H4) and acetylene (C2H2). All alkynes with a terminal triple bond undergo substitution reaction with CuCl
to give reddish brown colouration of Cu2C2 (B)

Correct option: B
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Question 17
A
Tin
B
Zinc
C
Copper
D
Lead
Explanation
Brass & Bronze are alloys they both contain copper

Correct option: C
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Question 18
A
C4H3O4
B
C12H3O
C
C4H10O5
D

C6H12O6

Explanation

Vapour density = x relative molar mass Relative molar mass 2 x 90
= 180
(CH2O)n = 180
[(12 x 1)+ (2) + 16)]n= 180
30n = 180
n =6
(CH2O)6 = C6H12O6 (D)


Correct option: D
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Question 19
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 20
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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