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 two ions responsible for hardness in water are
Ca\(^{2+}\) and / or Mg\(^{2+}\)
K\(^+\) and / or Mg\(^{2+}\)
Ca\(^{2+}\) and / or Li\(^+\)
Ca\(^{2+}\) and / or Na\(^+\)
Correct answer is A
No explanation has been provided for this answer.
1.7 litres
0.420 litres
0.588 litres
2.35 litres
Correct answer is C
No explanation has been provided for this answer.
Elements in the periodic table are arranged in the order of their
atomic numbers
metallic character
mass number
relative atomic mass
Correct answer is A
No explanation has been provided for this answer.
Which important nitrogen-containing compound is produced in Haber's process?
NH\(_3\)
NO\(_2\)
NO
HNO\(_3\)
Correct answer is A
No explanation has been provided for this answer.
1.12g
4.48g
1.80g
2.00g
Correct answer is D
Given Data:
Time (T) = 2hrs 30mins
where 2hrs =120mins
2hrs & 30mins = (120 + 30)mins = 150mins
150mins to Seconds = 150 x60 = 9,000s
Q = I x T
2 x 9,000 =18,000
where mg has valency of +2
So 2 x 96500 will discharge 24g of mg
and 18,000 will discharge xg of mg
2 x 96500 =24
18,000 =x
x = \(\frac{24 \times 18,000}{2 x 96500}\)
≈ 2.00g