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.
1.000 mole
0.100 mole
0.010 mole
0.111 mole
Correct answer is C
\(\frac{C_A V_A}{C_BV_B} = \frac{a}{b}\)
\(\frac{0.05 \times 10}{C_B \times 25} = \frac{2}{1}\)
50CB = 0.5
CB = \(\frac{0.5}{50} = \frac{1}{100}\)
= 0.01
In the electrolysis of CuSO4(g) using platinum electrodes, the reaction at the anode is
4H+ + 4e- → 2H2
4OH- + 4e- → 2H2O + O2
2OH - 2e- → 2OH
2OH- + 2OH- → 2H2O + O2
Correct answer is B
4OH<sup>-</sup> + 4e<sup>-</sup> → 2H<sub>2</sub>O + O<sub>2</sub> is the reaction of sun at the anode in the electrolysis of CuSO4 (g)
In which of the following is the oxidation number of sulphur equal to -2?
SO3
S8
H2S
SO2
Correct answer is C
No explanation has been provided for this answer.
The solution that will conduct the highest amount of electricity is?
0.5 mol dm-3 of hydrochloric acid
2.0 mol dm-3 of hydrochloric acid
0.5 mol dm-3 ethanoic acid
2.0 mol dm-3 ethanoic acid
Correct answer is B
Hence, for most aqueous solutions, the more ions, the higher the conductivity.
Strong electrolytes ionize completely e.g strong acid, strong bases and some salts
While weak electrolytes ionize only partially e.g CH3COOH is regarded as acetic acid.
It is a weak electrolyte. Acetic acid is regarded as weak electrolyte because its dissociation constant is low.
Zinc and carbon rods are used as anode and cathode respectively in a
Leclanche cell
lead accumulator
Daniel cell
voltaic cell
Correct answer is A
In a Leclanche cell, the anode and the cathode are a zinc rod and a carbon rod respectively. The electrolyte is an ammonium chloride solution or paste (wet or dry cell).