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.
The noble gases owe their inactivity to
Octet configuration
Cyclic shape
Hexagonal shape
Obtuse configuration
Correct answer is A
No explanation has been provided for this answer.
Neutral atoms of neon with atomic number 10 have the same number of electron as
O2+
Ca2+
K+
Mg2+
Correct answer is D
No explanation has been provided for this answer.
3Cu + pHNO3 →3Cu(NO
In the equation above, the values of p and x respectively are
1 and 3
2 and 3
6 and 2
8 and 2
Correct answer is D
No explanation has been provided for this answer.
The filter in the cigarette reduces the nicotine content by
Burning
Adsorption
Evaporation
Absorption
Correct answer is B
No explanation has been provided for this answer.
What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?
[Al = 27, S = 32, H = 1, O = 16]
14.29%
25.39%
50.79%
59.25%
Correct answer is D
Al2(SO4)3. 2H2O
2 * 27 + 3*32 + 14 * 16 + 4 * 1 =
54 + 96 + 224 + 4 = 378
% O2 = (224/378) * (100/1) = 59.25%