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.
A reaction is endothermic if the
reaction vessel feels cool during the reaction
enthalpy change is negative
bond forming energy exceeds bond breaking energy
heat of formation of reactants exceeds heat of formation of products
Correct answer is A
Endothermic reactions absorb heat from their surroundings during the reaction process. This means that in the course of the reaction the vessel being used in the reaction will be cool in the process.
double anions in its aqueous solution
a single cation in its aqueous solution
hydrogen ions in its aqueous solution
hydrogen atoms in its aqueous solution
Correct answer is C
Acid salts are salts whose aqueous solutions are acidic in character, implying that their aqueous solutions possess hydrogen ions.
0.08\(gdm^{-3}\)
2.00\(gdm^{-3}\)
8.00\(gdm^{-3}\)
80.00\(gdm^{-3}\)
Correct answer is B
1000\(cm^{3}\) = 1\(dm^{3}\)
200\(cm^{3}\) = 0.2\(dm^{3}\)
⇒ 0.2\(dm^{3}\) contains 0.4g
hence, solubility of the salt which is the amount of the salt dissolvable in 1\(dm^{3}\) is
\(\frac{0.4g}{0.2dm^{3}} = 2.0gdm^{-3}\)
The process of extraction of iron from its ore is
decomposition
oxidation
reduction
sublimation
Correct answer is C
The Iron is to to be gotten by the removal of oxygen from its ore, and this is called a reduction reaction.
Which of the following equations represents a redox reaction?
\(HNO_{{3}{(aq)}} + NaOH_{(aq)} \to NaNO_{{3}{(aq)}} + H_{2}O_{(l)}\)
\(AgNO_{{3}{(aq)}}+KCl_{(aq)} \to AgCl_{(s)}+KNO_{{3}{(aq)}}\)
\(CaCO_{{3}{(s)}} \to CaO_{(s)} + CO_{{2}{(g)}}\)
\(2H_{2}S_{(s)} + SO_{{2}{(g)}} \to 2HO_{2} + 3S_{(g)}\)
Correct answer is D
No explanation has been provided for this answer.