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.
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
Addition of washing soda
Adding of soap
Treatment with carbon exchange resin
Filtration
Distillation
Correct answer is D
No explanation has been provided for this answer.
The component of air that removed when air is bubbled into alkaline pyrogallol solution is
carbon(lV) oxide
oxgyen
water vapour
nitrogen
helium
Correct answer is B
No explanation has been provided for this answer.
Which of the following substances is a peroxide?
Na2O2
CuO
Pb
Fe2O
AI2O
Correct answer is A
No explanation has been provided for this answer.
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
F < CI < Br < l
l < Br < CI < F
I < CI < Br < F
Br < I < CI < F
CI < F < I < Br
Correct answer is B
No explanation has been provided for this answer.
600cm-3
800cm-3
1,000cm-3
3,600cm-3
4,000cm-3
Correct answer is D
\(400cm^{3} \to 2moldm^{-3}\)
\(0.4 dm^{3} \to 2moldm^{-3}\)
Multiplying in order to get the moles of the acid.
\(0.4dm^{3} \times 2moldm^{-3} = 0.8moles\)
After diluting to \(0.2moldm^{-3}\), the new volume will be
\(\frac{0.8}{0.2} = 4dm^{3}\)
Converting back to cm^3,
We have \(4 \times 1000cm^{3} = 4000cm^{3}\)
Hence, the volume of water added = \((4000 - 400)cm^{3} = 3600cm^{3}\)