Waec Chemistry 2000 Past Questions and Answers

Question 41:

• WAEC 2000

Biotechnology is applied in the following except

A. Baking industry
B. Wine production
C. Production of antibiotics
D. Manufacture of soap

Question 42:

• WAEC 2000

A plastic which cannot be softened by heat is described as

A. Thermosetting
B. Non-biodegradable
C. Thermoplastic
D. Malleable

Question 43:

• WAEC 2000

Allotropes of an element differ in their

A. Physical properties
B. Chemical properties
C. Mass numbers
D. Electronic configuration

Question 44:

• WAEC 2000

What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?

A. 32
B. 22
C. 20
D. 10

Question 45:

• WAEC 2000

Given that the electronic configuration of an element X is 1s²2s²2p⁶3s ²3p⁴, it can be deduced that X

A. Belongs to group VI in the Periodic Table
B. Belongs to periodic Table
C. Contains 3 unpaired electrons in the ground state
D. Has atomic number 27