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.
CO2 + C → 2CO
2Fe2O3 + 3C → 4Fe + 3CO2
Fe2O3 + 3C → 2Fe + 3CO2
CaCO3 → CaO + CO2
CaO + SiO2 → CaSiO3
Correct answer is B
No explanation has been provided for this answer.
5.00 mole dm3
5.67 mole dm3
6.00 mole dm3
6.67 mole dm3
7.00 mole dm3
Correct answer is D
1.95 gms of NaCl dissolves in 5 cm solution at 30°C
Number of gm of solute required to dissolve in
100 gm = (1.950 x 100)/ (5 x 1) = 1.95 x 20 = 39.0
390 gms will dissolve in 1000 dm3
Solution
Solubility of NaCl at 30°C in
(dm3 is 390)/(Mol wt g NaCl) = 6.67 mol dm3
ionic
covalent
dative covalent
metallic
none of the above
Correct answer is B
No explanation has been provided for this answer.
Which of the following is NOT a true statement of the kinetic Theory of Gases?
The molecules move at random
The size of molecules is negligble as compared with the volume of gas
The molecular collisions are perfectly elastic
Every molecule has the same kinetic energy at a particular temperature
The average kinetic energy is proportional to the absolute temperature of the gas
Correct answer is D
No explanation has been provided for this answer.
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
Na2SO4 + SO2 + O2 + H2O
Na2SO3 + SO3 + O2 + H2O
Na2SO4 + SO2 + S + H2O
Na2SO4 + SO3 + S + H2O
Na2SO4 + SO2 + H2O only
Correct answer is C
\(Na_2S_2O_3 + H_2SO_4 → Na_2SO_4 + SO_2 + S↓ + H_2O\). Sodium thiosulfate reacts with sulfuric acid to produce sodium sulfate, sulphur dioxide, sulfur, and water.