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 concentrated sodium chloride solution is electrolysed using inert electrodes, the products are
oxygen and hydrogen
hydrogen and chlorine
sodium and oxygen
sodium and chlorine
Correct answer is B
No explanation has been provided for this answer.
-2 to + 3
-2 to + 6
+6 to +3
+7 to + 6
Correct answer is C
No explanation has been provided for this answer.
Which of the following compounds will leave a metal residue when heated?
Cu(NO3)2
AgNO3
K2CO3
CaCO3
Correct answer is B
No explanation has been provided for this answer.
CuSO45H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by
evaporation to dryness
using chromatography
precipitation
crystallization
Correct answer is D
No explanation has been provided for this answer.
Average rate of evoluton of gas
Total mass of gas evolved during the reaction
Time taken for the reaction to reach completion
Initial reaction rates
Correct answer is B
The total mass of gas evolved during the reaction will remain the same in each case. This is because the amount of marble chips is the same in each case, and the reaction goes to completion. Therefore, the same amount of gas will be produced in each case, regardless of the concentration of the hydrochloric acid.