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waec-chemistry-2020

5 followers

50 questions


An example of biodegradable pollutant is
An example of biodegradable pollutant is A. plastic B. sewage C. carbon (II) oxide D. hydrogen sulphide
22 days ago 1 answer(s) 3 votes


Calcium chloride is an ionic compound. Which of the followin...
Calcium chloride is an ionic compound. Which of the following statements account for its ionic character? I. Calcium has high ionization energy ...
22 days ago 1 answer(s) 3 votes


Dilution factor is the
Dilution factor is the A. amount of distilled water that is added to the concentrated solution to dilute it B. quantity of distilled water ad...
22 days ago 1 answer(s) 2 votes


Which of the following quantities is a molar quantity?
Which of the following quantities is a molar quantity? A. Molarity B. Molar mass C. Mass concentration D. Molality
22 days ago 1 answer(s) 2 votes


Which of the following processes is not exhibited by atoms i...
Which of the following processes is not exhibited by atoms in order to attain more stable electron configuration? A. Gaini...
22 days ago 1 answer(s) 3 votes


The atomic number of an atom would be equal to its mass numb...
The atomic number of an atom would be equal to its mass number if it A. has a totally filled valence shell B. has a high charge to mass ratio...
22 days ago 1 answer(s) 2 votes


How many electrons does 31 15 P^3- contain ?
How many electrons does 3115P3- contain ? A. 12 B. 15 C. 16 D. 18
22 days ago 1 answer(s) 2 votes


The steps that could be taken to obtain pure dry sample of A...
Consider the reaction represented by the following equation: AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
22 days ago 1 answer(s) 2 votes


The metallic bond in magnesium is stronger than that in calc...
The metallic bond in magnesium is stronger than that in calcium because magnesium has a A. larger atomic radius B. smaller atomic radius ...
22 days ago 1 answer(s) 2 votes


Which of the following arrangement of elements is in decreas...
Which of the following arrangement of elements is in decreasing order of electronegativity? A. Na, Mg, Al, Si, P B. Na, Al, Mg, P, Si
22 days ago 1 answer(s) 2 votes