Waec Chemistry 2019 Past Questions and Answers

Question 46:

• WAEC 2019

Which of the following apparatus is NOT used in volumetric analysis?

A. Pipette
B. Burette
C. Desiccator
D. Conical flask

Question 47:

• WAEC 2019

One of the deductions from Rutherford's alpha particle scattering experiment is that?

A. Electrons are negatively charged
B. Electrons have a negligible mass
C. Nuclei of atoms are positively charged
D. Protons are positively charged

Question 48:

• WAEC 2019

The atoms of \(^{64}_{29}\)Cu and \(^{65}_{30}\)Zn have the same number of?

A. Nucleon
B. Electrons
C. Neutrons
D. Protons

Question 49:

• WAEC 2019

The number of electrons in the 3d orbital of \(_24\)Cr is

A. 2
B. 3
C. 4
D. 5

Question 50:

• WAEC 2019

The method used to collect gas in the laboratory depends on its?
I. boiling point II. density III. smell IV. solubility in water

A. I and ii only
B. Ii and iv only
C. Iii and iv
D. I, ii, iii and iv