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.
Which of the following equations is NOT balanced?
CH4(g) + 202(9) → CO2(g) + 2H2O(g)
CU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)
2KCIO3(s) → 2KCI(s)+ 3O2(g)
NaH(s) + H2O(1) → NaOH(aq) +H2(g)
Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
Correct answer is B
No explanation has been provided for this answer.
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
ammonia
carbon(IV)oxide
hydrogen chloride
sulphur (IV) oxide
sulphur (VI) oxide
Correct answer is A
No explanation has been provided for this answer.
In which of the following equations can Le-chartelier’s principle be applied?
H2(g)+S(g) → H2(g)
2H2S(g) + O2 (g) → 2H2O(l) + 2SO2(g)
N2(g) +3H2(g) ⇌ 2NH3(g)
NaOH(aq) +CO2(g) → Na2CO3(aq) + H2O(l)
S(s) + 02(g) → SO2(g)
Correct answer is C
According to Le Chatelier's Principle, this will be favored if you lower the temperature. The system will respond by moving the position of equilibrium to counteract this - in other words by producing more heat. To get as much ammonia as possible in the equilibrium mixture, you need as low a temperature as possible
In which of these groups will all the substances be insoluble in water?
Na2CO3, KNO3,(NH4)2C03
NaHCO3, PbSO4, CaSO4
K2C03, CaSO4, AgNO3
PbCl2, NaCl, ZnCl2
ZnCO3, BaSO4,AgCl
Correct answer is E
No explanation has been provided for this answer.
What is the maximum number of electrons that an f-orbital can accommodate?
2
6
7
10
14
Correct answer is E
No explanation has been provided for this answer.
A measure of the degree of disorderliness in a chemical system is known as the
activation energy
enthalpy
entropy
equilibrium
free energy.
Correct answer is C
No explanation has been provided for this answer.
A substance is said to be hygroscopic when it
absorbs atmospheric moisture and then goes into solution
absorbs atmospheric moisture but does not go into solution
changes colour
is not affected by atmospheric moisture
losses its water of crystallization
Correct answer is B
No explanation has been provided for this answer.
The electrode potential in volts of 2H+(aq) / H2(q) system is
-2.87
-2.71
0.8
1.68
Correct answer is E
No explanation has been provided for this answer.
Chromatography is used to separate components of mixtures which differ in their rates of
diffusion
migration
reaction
sedimentation
sublimation
Correct answer is B
No explanation has been provided for this answer.
hydrogen ions are in greater concentration than sodium ions.
hydrogen is higher than sodium in the electrochemical series.
hydrogen is lower than sodium in the electrochemical series.
of the nature of the electrodes.
the concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.
Correct answer is C
No explanation has been provided for this answer.
Transaction Monitoring Officer at First Bank of Nigeria Limited
Store Keeper at Jott Industries Nigeria Limited
Driver at Bellpoint Energy Limited
Medical Laboratory Scientists at Zael Business Management & Consulting
Admin Officer at PalmPay Limited
Cost Controller at IBIC Investment Holdings
Procurement Manager at Ginos Ventures Limited
Subsidiary Compliance Officer at First Bank of Nigeria Limited
Business Analyst, Compliance Projects Delivery at First Bank of Nigeria Limited
