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.
Calcium and magnesium belong to the group of the periodic table because both?
are metals
form cations
form colourless salts
have same number of valence electrons
Correct answer is D
No explanation has been provided for this answer.
0.54g
0.70g
1.08g
1.40g
Correct answer is A
24g of Mg will liberate 2g of H
: 6.5g of Mg will liberate Xg of H
= ( 6.5 X 2 ) / 24
= 0.5416g of Hygrogen ( H )
The bleaching action of chlorine is through the process?
Hydration
Hydrolysis
Reduction
Oxidation
Correct answer is D
The bleaching action lof chlorinr is due to its ability to react with water to form oxochlorate(i)acid
which of the following elements has the highest ionization energy?
Calcium
Chlorine
Flourine
Magnesium
Correct answer is C
The ionisation energy is the minimum energy required to remove the most loosely bound electron of an isolated gaseous atom, positive ion, or molecule.
Fluorine has the highest ionization energy when assessed through the trend on the periodic table.
Which of the following metals reacts slowly with cold water?
Iron
Silver
Calcium
Pottassium
Correct answer is C
Calcium reacts very slowly with cold water