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.
What volume of 0.5 mol dm-3 H2SO4 will exactly neutralize 20cm3 of 0.1 mol dm-3 NaOH solution?
2.0 cm3
5.0 cm3
6.8 cm3
8.3 cm3
Correct answer is A
2NaOH + H2SO4 → Na2SO4 + 2H2O
CaVa/CbVb = ratio of acid/ratio of base
(0.5 * Va)/(0.1 * 20) = 1/2
∴ Va = 2.0cm
Which of the following compound is a normal salt?
NaHS
NaHSO4
NaHCO3
Na2CO3
Correct answer is D
No explanation has been provided for this answer.
Calcium tetraoxosulphate (VI) dissolves in water only sparingly to form a
solution
suspension
precipitate
colloid
Correct answer is C
No explanation has been provided for this answer.
0.13
0.25
1.25
2.00
Correct answer is C
Relative molecular mass of CuSO4 = 64 + 32 + 16 * 4 = 160
The number of moles of CUSO4 = reacting mass/molecular mass = 20/160 = 0.125
100g of water dissolved 0.125m of CuSO4
100g of water will dissolve (0.125 * 1000)/100 = 1.25mol dm3
asbestos dust
sawdust
nitrogen (II) oxide
carbon (II) oxide
Correct answer is A
No explanation has been provided for this answer.