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 oxygen
sodium and oxygen
soduim hydroxide, hydrogen and chlorine
Correct answer is D
When concentrated NaCl solution undergoes electrolysis, sodium hydroxide and hydrogen are produced at the cathode while chlorine is produced at the anode.
smaller mass
lower electrical charge
greater stability in solution
stronger tendency to accept electrons
Correct answer is D
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.
A visible change is observed when a strip of iron is placed in an aqueous solution of
FeSO4
ZnSO4
CuSO4
MgSO4
Correct answer is C
No explanation has been provided for this answer.
Which of the compounds will leave a metal residue when heated?
Cu(NO 3 )2
AgNO3
K2CO3
CaCO3
Correct answer is B
No explanation has been provided for this answer.