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.
Hydrogen can be displaced from a hot alkaline solution by
Fe
Cu
Ca
Sn
Correct answer is D
Tin dissolves in concentrated solution of alkalis to give trioxostannate(IV) salt and hydrogen.
2.0 mole of Q3+
2.5 mole of R2+
3.0 mole of T-
4.0 mole of Y-
Correct answer is A
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
15.3cm3
87.3cm3
2.0cm3
97.0cm3
Correct answer is D
\(\frac{V_{1}}{T_{1}}\) = \(\frac{V_{2}}{T_{2}}\)
\(T_{1}\) = 3 + 273 = 276K
\(T_{2}\) = 18 + 273 = 291K
\(V_{1}\) = \(92cm^{3}\)
\(V_{2}\) = ?
\(V_{2}\) = \(\frac{V_{1}T_{2}}{T_{1}}\)
=\(\frac{92 \times 291}{276}\)
= \(97.0cm^{3}\)
Charles’s law
Boyles’s law
Graham’s law
Avogadro’s law
Correct answer is B
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 Boyle’s law. Option A,C,D are not in support of the equation...
Tartaric acid is used industrially to
make baking powder
make fruit juice
remove rust
dry substance
Correct answer is A
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)