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.
An element Z contains 80% of \(^{16} _8\)Z and 20% of \(^{18} _8\)Z. Its relative atomic mass is
16.2
17.6
16.0
16.4
Correct answer is D
R.A.M of Z = \(16(\frac{80}{100}) + 18(\frac{20}{100})\)
= \(12.8 + 3.6\)
= 16.4
How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?
none
6
7
8
Correct answer is A
Electrons are found in the orbit of the atom. They revolve around the nucleus. There's no electron found in the nucleus of an atom.
Al\(^{3+}\), Cl\(^-\)
Hg\(^+\), SO\(_4 ^{2-}\)
Pb\(^{2+}\), Cl\(^-\)
Ag\(^+\), SO\(_4 ^{2-}\)
Correct answer is C
No explanation has been provided for this answer.
The reaction \(2H_2 S + SO_2 \to 3S + 2H_2 O\) is
not a redox reaction because there is no oxidant in the reaction
not a redox reaction because there is no reductant in the reaction
a redox reaction in which H\(_2\)S is the oxidant and SO\(_2\) is the reductant
a redox reaction in which SO\(_2\) is the oxidant and H\(_2\)S is the reductant
Correct answer is D
No explanation has been provided for this answer.
How many alkoxyalkanes can be obtained from the molecular formula C\(_4\)H\(_{10}\)O?
4
2
1
3
Correct answer is D
No explanation has been provided for this answer.