50 cm³ of carbon (II) oxide was exploded with 150 cm³ 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 Correct Answer: Option C – Oxygen Explanation 2CO + O2 → 2CO2 50cm³ → 25cm³ 20% X 150 = 30cm³ 30cm³ is the volume of oxygen available for the reactions. But only 25 cm³ is required; therefore O2 is...
Which of the following compounds is composed of Al; Si; O and H?
A. Epsom salt B. Limestone C. Clay D. Urea Correct Answer: Option C – Clay
Sieving is a technique used to separate mixture containing solid particles of?
A. small sizes B. large sizes C. different sizes D. the same sizes Correct Answer: Option C – different sizes
A mixture of iodine and sulphur crystals can be separated by treatment with?
A. Water to filter off sulphur B. carbon (IV) sulphide to filter off iodine C. ethanoic acid to filter off sulphur D. methanol to filter off iodine Correct Answer: Option B – carbon (IV) sulphide to filter off iodineProducts
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