Waec Chemistry 2019 Past Questions and Answers

Question 16:

• WAEC 2019

What is the percentage by mass of H in CH3COOH

A. 1.7%
B. 5.0%
C. 6.7%
D. 7.1%

Question 17:

• WAEC 2019

Which of the following compounds has coordinate bonds in its structure?

A. Al\(_2\)Cl\(_6\)
B. MgCl\(_2\)
C. AgCl
D. NaCl

Question 18:

• WAEC 2019

The name of the compound CH\(_3\)C(CH\(_3\))CH\(_2\)CH\(_2\)CH\(_3\)

A. 2 - methyl butane
B. 2,2 - dimethyl butane
C. 2 - methyl pentane
D. 2,2 - dimethyl pentane

Question 19:

• WAEC 2019

The properties of a good primary standard include the following except?

A. High molecular mass
B. Low molecular mass
C. High degree of purity
D. Readily available

Question 20:

• WAEC 2019

What is the solubility of a salt X at 25ºC if the saturated solution of the salt contains 0.28g in 100cm\(^3\) of the solution in mol\dm\(^3\)?
[ X = 56.0g ]

A. 0.05
B. 0.10
C. 2.60
D. 2.80