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50cm3 of carbon(ii)oxide was exploded with 150cm3 of…

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50cm3 of carbon(ii)oxide was exploded with 150cm3 of air containing 20% oxygen by volume, which of the reactants was in excess?

A. Carbon(ii)oxide

B. Carbon(iv)oxide

C. Oxygen

D. Nitrogen

QUICK ANSWER…

C

SOLUTION…  

Carbon (ii) oxide reacts with oxygen to form carbon (iv) oxide as follows:

2016 JAMB-UTME Chemistry past question 39

Now for the right answer to the above question:

  1. Option A is incorrect. carbon (ii) oxide is clearly not in excess from our calculation.
  2. Option B is incorrect. carbon (iv) oxide is not one of the reactants but, a product and one of the components of air. Remember the question is specific in the word reactants.
  3. C is correct. oxygen is clearly in excess by 5 cubic cm.
  4. D is not the correct answer. Nitrogen is not one of the reactants.

KEY-POINTS…

You may please note these/this:

RELATED!  What volume of oxygen will remain after reacting 8cm3 of...
  • The quantity of any substance required to react with another is usually specific and depends on the number of moles shown to be needed in the balanced equation.
  • If more than what the balanced equation requires is supplied, the excess can effectively be calculated.

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/ culled from 2016 JAMB-UTME Chemistry past question 39 /

50cm3 of carbon(ii)oxide was exploded with 150cm3 of... » QuizTablet
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