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.
When a piece of charcoal enclosed in a cylinder containing air is ignited
the toatl volume of air is increased
the relative amount of oxygen present is increased
the relative amount of nitrogen present is decreased
the relative amount of carbondioxide present is increased
the ratio of oxygen to nitrogen in the system is increased
Correct answer is D
No explanation has been provided for this answer.
N2O2
NO
NO2
N2O
N2O3
Correct answer is C
No explanation has been provided for this answer.
Sulphur hydrogen
Hydrogen oxygen
Oxygen Hydrogen
Hydrogen sulphate ions
Sulphur oxygen
Correct answer is C
Dissociation of sulfuric acid,
\(H_2SO_4→2H^+_{(aq)}+SO^{−2}_{4(aq)}\)
Dissociation of water,
\(H_2O→H^+_{(aq)} + OH^−_{(aq)}\)
At Anode : \(4OH^−→2H_2O_{(l)} + O_{2(g)} + 4e_{−}\)
At Cathode : \(2H^+_{(aq)} + 2e^− → H_{2(g)}\)
66
33
10
20
30
Correct answer is E
solubility = \(\frac{solute x 100}{solvent}\)
The solubility of KClO3 at 66oC will be \(\frac{12}{40} \times \frac{100}{1}\)
= 30
the solution will give out chlorine gas and hydrogen chloried gas
the solution will produce chlorine gas and oxygen
the solution will give out solution will producing hypochloric acid
the solution is decomposed giving out oxygen, hydrogen and chlorine
the solution will give out oxygen gas leaving behind aqueous hydrochloric acid
Correct answer is E
No explanation has been provided for this answer.