Chemistry 2015 | Study Mode

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Question 11
A
He
B
Xe
C
Ar
D
Rr
Explanation
Helium has the greatest ionization energy because they are less stable. Options B,C,D have low ionization energy because one more stable and do not react easily

Correct option: A
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Question 12
A
ionic
B
covalent
C
co-ordinate covalent
D
vander Waals
Explanation
Vander Waals are the weakest attractive forces that exist between two molecules. Option A,B,C are not weak forces because the force attraction that exist between their interested molecule are very strong

Correct option: D
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Question 13
A
nitrogen
B
aluminum
C
copper
D
sulphur
Explanation
Sulphur is an element that burns with a strongly explosive smell, as a result it is explosive smell

Correct option: D
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Question 14
A
are positively charged
B
are negatively charged
C
Have mass
D
travel in straight lines
Explanation
Rays travels in straight lines and finds its way through any opening available. It could be refracted, reflected or transmitted based on any obstacle. Option A,B,C are not the reason why the cathode are coasted shadows

Correct option: D
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Question 15
A
electrons
B
Holes and electron
C
Ions
D
Charges
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: C
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Question 16
A
bromine water
B
Fehlings solution
C
sodium hydrogen trioxocarbonate (iv)
D
Ammoniacal silver trioxonitrate(V)
Explanation
Sodium hydrogen trionocarbonate iv is the only distinguishing reagent between ethanoic and ethanol. Option A, B, D are not conspicuous in distinguishing between ethanoic and ethanol

Correct option: C
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Question 17
A
cathode ray tube
B
glass tube and discharge tube
C
discharge tube with terminal cathode
D
discharge tube with central cathode
Explanation
Discharge tube with central cathode is an apparatus for producing cathode rays and positive rays. Option A,B,C will not yield cathode rays and positive rays

Correct option: D
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Question 18
A
chlorine
B
nitrogen
C
calcium
D
neon
Explanation
Nitrogen has an electronic configuration of 7 i.e
1s2 2ps2 2p3. option A,C,D are chlorine 17, calcium 20, neon 10

Correct option: B
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Question 19
A
Pb
B
Ca
C
Na
D
Mg
Explanation
Calcium is the only metal that burn with brick red flame. Option A,C,D will not burn with brick red flame rather burn with brick blue flame

Correct option: B
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Question 20
A
increase the solubility of soap
B
decrease the solubility of the soap
C
saponify the soap
D
emulsify the soap
Explanation
Concentrated sodium chloride solution will the solubility of soap along the course of soap production. Options A,C,D are not appropriate

Correct option: B

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