Chemistry 2015 Waec Past Questions and Answers

Question 46 :

• WAEC 2015

A substance responsible for the sour taste of unripe orange is

A. Alkene
B. Alkanol
C. Alkanoic acid
D. Alkanoate

Question 47 :

• WAEC 2015

Which of the following products of biotechnology can be used as a fuel in place of petrol?

A. Butane
B. Ethanol
C. Ethene
D. Propanol

Question 48 :

• WAEC 2015

Which of the following polymers in thermosetting?

A. Bakelite
B. Nylon
C. Polypropene
D. Polystyrene

Question 49 :

• WAEC 2015

Which of the following gases is monoatomic?

A. Argon
B. Chlorine
C. Nitrogen
D. Oxygen

Question 50 :

• WAEC 2015

The correct balanced equation for the reaction between aluminium metal and hot concentrated tetraoxosulphate(VI)acid is ?

A. 2AI_(s) + 6H₂SO₄₍₁₎ \(\to\) AI2(SO₄)_3(aq) + 6H₂O(1) + 3SO_2(g)
B. 2AI_(s) + 3H₂SO₄₍₁₎ \(\to\) AI₂(SO₄)_3(aq) + 6H₂O(1) + 3SO_2(g)
C. 2AI_(s) + 4H₂SO₄₍₁₎ \(\to\) AI₂(SO₄)_3(aq) + 8H₂O(1) + 3SO_2(g)
D. 2AI_(s) + 5H₂SO₄₍₁₎ \(\to\) AI₂(SO₄)_3(aq) + 8H₂O(1) + 3SO_2(g)