Chemistry 2015 | Study Mode

Question 21
A
hydrochloric acid
B
calcium hydrochloride
C
kerosene
D
water
Explanation
Kerosene is only liquid that will dissolve fat. Option A,B,D will not dissolve fat because of their chemical composition

Question 22
A
make baking powder
B
make fruit juice
C
remove rust
D
dry substance
Explanation
A is the correct answer. Tartaric acid is found in cream of tartar, which is used in cooking candies and frostings for cakes. Tartaric acid is also found in baking powder, where it serves as the source of acid that reacts with sodium bicarbonate (baking soda)

Question 23
A
Charless law
B
Boyless law
C
Grahams law
D
Explanation
V = 1/P

cross multiply

K = VP

V1P1 = V2V2

For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant.
The equations supports only Boyles law. Option A,C,D are not in support of the equation...

Question 24
A
15.3cm3
B
87.3cm3
C
2.0cm3
D
97.0cm3
Explanation

$$\frac{V_{1}}{T_{1}}$$ = $$\frac{V_{2}}{T_{2}}$$
$$T_{1}$$ = 3 + 273 = 276K
$$T_{2}$$ = 18 + 273 = 291K
$$V_{1}$$ = $$92cm^{3}$$
$$V_{2}$$ = ?
$$V_{2}$$ = $$\frac{V_{1}T_{2}}{T_{1}}$$

=$$\frac{92 \times 291}{276}$$
= $$97.0cm^{3}$$

Question 25
A
2.0 mole of Q3+
B
2.5 mole of R2+
C
3.0 mole of T-
D
4.0 mole of Y-
Explanation
2.0 mole of Q3+ ions require the largest quantity of electricity for discharge at an electric. option B,C,D are all carrying a smaller quantity of electricity which not be proven for ant discharge

Question 26
A
Fe
B
Cu
C
Cn
D
Sn
Explanation
Fe displaces hydrogen from hot alkaline solution. Options B,C,d will not displace hydrogen

Question 27
A
I, II and III
B
I and II only
C
III only
D
I only
Explanation
Only primary alkanols undergo oxidation to produce alkanoic acid. Option A,B,C will not produce alkanoic acid

Question 28
A
are monoatomic
B
form ions easily
C
have duplet or octet electronic configuration in the outermost shells in their atoms
D
are volatile gases
Explanation
Rare gases are stable because they have duplet or octet electronic configurations in the outermost shells in their atoms, as a result they dont go into solution easily. option A, B, Dare not because they go into solution easily (unstable)

Question 29
A
coal
B
wood
C
fuel
D
chlorofluorocarbons
Explanation
Coal is a major senses of oxide of nitrogen. Option B,C, D do not contribute to the anode Nitrogen either. They are sources of oxides of carbon of sulphur etc

Question 30
A
uranium
B
C
actium
D
thorium
Explanation
Uranium is common nuclear because of its less stability as a result has a great tendency to increase energy than. Options B,C,D which are not stable

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