Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
multiple proportion
conservation of mass
constant composition
reciprocal proportion
Correct answer is C
0.36g of Cl combines with 0.2g of x
1g of Cl will combine with \(\frac{1 \times 0.2}{0.32}\) = 0.56
0.71g of U combines with 0.49g of x
1g of U will combine with \(\frac{1 \times 0.4}{71}\) = 0.56
Ratio 0.56 : 0.56 = 1:1
An iron ore is known to contain 70.0% Fe2O3. The obtain from 80kg of the ore is?
(Fe = 56, O = 16)
35.0 kg
39.2 kg
70.0 kg
78.4 kg
Correct answer is B
2Fe2O3 → 4Fe + 3O2
320g 224g 96g
(70) / (100) x (80) / (1) 56g
if 0.32kg of Fe293 contains 0.224 kg
Then 56kg will contain (56 x 0.224) / (0.32) =39.2 kg
i, ii and iii
i, ii and iv
i and ii only
i and iv
Correct answer is A
No explanation has been provided for this answer.
Which of the following can be obtained by fractional distillation?
Nitrogen from liquid air
Sodium chloride from sea water
Iodine from a solution of Iondine in carbon tetrachloride
Sulphur from a solution of sulphur incarbon disulphide
Correct answer is A
No explanation has been provided for this answer.
0.20
0.30
0.04
5.87
Correct answer is A
0.1F ↔ 2.95 g Ni = 0.4F ↔ 11.8 g Ni
No of moles = (11.8)/(58.2) = 0.20 moles