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.
Cu2+
Cl-
H+
OH-
Correct answer is A
Metallic ions are discharged at the cathode
Ions lower in the electrochemical series are most easily discharged
Cu\(^+\) will be preferentially discharged
-1142 kJ
-571 kJ
+1142 kJ
-1713 kJ
Correct answer is D
2H2 + O22 → H2+O ΔH = -571kJ
4.0g of Hydrogen burn in air to produce -571 kJ
∴ 12.0s of Hydrogen will burn in air to produce
(12 * -571)/4 = -1713kJ
2NO(g) + O2(g) → 2NO2(g)
NO(g) + Cl2(g) → NOCl2(l)
FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
NO(g) + Br2(l) → NOBr2(l)
Correct answer is B
The oxidation number of the nitrogen of N in NO = 2
The oxidation number of the nitrogen of N in NOCl\(_2\) = 4
OPTION B is the correct option
When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is
neutral
zero
positive
negative
Correct answer is D
No explanation has been provided for this answer.
Phenolphthalein in acidic solution is
red
orange
colourless
yellow
Correct answer is C
No explanation has been provided for this answer.