Chemistry 2014 | Study Mode

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Question 11
A
Ca (HCO3)2 and Mg (HCO3)2 salts
B
Ca (HCO3)2 and CaCO3 SALTS
C
Mg(HCO3)2 and CaSO4 salts
D
CaSO4 and Ca(HCO3)2 salts
Explanation

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Correct option: A
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Question 12
A
efflorescence
B
diliquescence
C
hygroscopy
D
hydrolysis
Explanation

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Correct option: A
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Question 13
A
0.05 g
B
2.00 g
C
1.00 g
D
0.50g
Explanation

molar mass of pb (N0 3) 2 = 331
Mole = \(\frac{16.55}{331}\)= 0.05 mole
0.05mole pb (No3)2 dissolved in 1000g H2O x = \(\frac{0.05\times1000}{100}\)= 0.5 mole /dm 3


Correct option: D
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Question 14
A
an emulsion
B
a fog
C
a gel
D
an aerosol
Explanation

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Correct option: A
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Question 15
A
improve machinery so that the substances released from combustion are less harmful
B
pass strict laws against it by individuals and companies
C
educate people on the causes and effects of pollution
D
convert chemical wastes to harmless substances before releasing them into the environment
Explanation

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Correct option: C
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Question 16
A
4
B
1
C
2
D
3
Explanation

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Correct option: B
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Question 17
A
purple
B
pink
C
yellow
D
orange
Explanation

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Correct option: A
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Question 18
A
log 10[OH-]
B
log 101/[H 3 O+]
C
log 10[H 3 O+]
D
log 101/[OH -]
Explanation

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Correct option: B
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Question 19
A
Sodium tetrahydroxozincate (ll)
B
Potassium hydrogentetraoxosulphate (lV)
C
Sodium trioxocarbonate (lV)
D
Zinc chloride hydroxide
Explanation

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Correct option: B
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Question 20
A
0 to + 4
B
0 to + 2
C
+ 1 to + 2
D
+ 1 to + 3
Explanation

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Correct option: B

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