Waec Chemistry 1993 Past Questions and Answers

Question 26:

• WAEC 1993

In which of the following pairs are both substances deliquescent?

A. CaCI₂ and H₂SO₄
B. NaOH and MgSO₄ 7H₂O
C. CaCI₂ and NaOH
D. CUO and NaCI
E. CaCO₃ and MgCI₂

Question 27:

• WAEC 1993

Producer gas is a mixture of

A. Oxygen and hydrogen
B. Hydrogen and nitrogen
C. Nitrogen and oxygen
D. Nitrogen and carbon (ll) oxide
E. Hydrogen and carbon (ll) oxide

Question 28:

• WAEC 1993

An alkene may be converted to an alkane by

A. Halogenation
B. Hydrolysis
C. Dehydration
D. Hydrogenation
E. Decomposition

Question 29:

• WAEC 1993

Which of the following gases are diatomic except

A. Nitrogen
B. Helium
C. Hydrogen
D. Fluorine
E. Oxygen

Question 30:

• WAEC 1993

Which of the following is correct about the electrons in the 1s orbital? They

A. Have the same spin
B. Are easier to remove than those in the 2p orbital
C. Are closest to the nucleus
D. Have the same energy as those in the 2s orbital
E. Have different magnetic quantum numbers