WAEC Chemistry 2015 Objective — Question 49
Question 49 of 50 from the West African Examinations Council (WAEC) Chemistry 2015 Objective paper, with the correct answer and a full explanation.
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The correct balanced equation for the reaction between aluminium metal and hot concentrated tetraoxosulphate (VI) acid is
- A. 2Al(s)+6H₂SO₄(aq)→Al₂(SO₄)₃(aq)+6H₂O(l)+3SO₂(g)Correct
- B. 2Al(s)+3H₂SO₄(aq)→Al₂(SO₄)₃(aq)+6H₂O(l)+3SO₂(g)
- C. 2Al(s)+4H₂SO₄(aq)→Al₂(SO₄)₃(aq)+8H₂O(l)+4SO₂(g)
- D. Al(s)+3H₂SO₄(aq)→Al₂(SO₄)₃(aq)+6H₂O(l)+3SO₂(g)
Explanation
The correctly balanced equation is 2Al+6H₂SO₄→Al₂(SO₄)₃+6H₂O+3SO₂, balancing Al, S, H and O atoms on both sides.
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