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.
0.056dm3
0.224dm3
224.000dm3
56.000dm3
Correct answer is A
Q = 193 x 5 = 965C
40H \(\mapsto\) 2H2O + O2 + 4e
4 x 96500C = 22.4dm3
965C = x
x = \(\frac{22.4 \times 965}{4 \times 96500}\)
= 0.056dm3
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
16
15
31
46
Correct answer is B
No explanation has been provided for this answer.
An example of a solid emulsion is
Butter
Hair cream
Milk
Cod-liver oil
Correct answer is A
No explanation has been provided for this answer.
Blue
Red
Orange
Purple
Correct answer is D
Neutral litmus paper is purple. the result of a neutralization reaction is salt and water and hence is neutral.
In the extraction of iron, the waste gas from the furnace is a mixture of
PH3 CO and CO2
CO and C
N2 , CO and CO2
PH3 and CO
Correct answer is C
the \(N_2\) from the hot air blast to burn the coke (48%), the \(CO\) (23%) and \(CO_2\) (21%) produced from the reduction of the iron ore \(Fe_{2}O_{3}\) by carbon (the coke) are the major components of the waste from the extraction.