Q.1
What is the relative formula mass of copper sulfate CuSO ?
  • 160 amu
  • 96 amu
  • 128 amu
  • 144 amu
Q.2
What is the relative formula mass of MgF ?
  • 60 amu
  • 62 amu
  • 43 amu
  • 64 amu
Q.3
What % mass of magnesium oxide is magnesium?
  • 60%
  • 40%
  • 30%
  • 70%
Q.4
What is the % mass of hydrogen in methane CH ?
  • 20%
  • 25%
  • 75%
  • 12.5%
Q.5
Calcium reacts with oxygen as shown by this reaction 2Ca + O → 2CaO. What mass of oxygen will react with 60g of calcium?
  • 12g
  • 24g
  • 6g
  • 14g
Q.6
Sodium hydroxide reacts with chlorine to make bleach as shown by this reaction. 2NaOH + Cl → NaOCl + NaCl + H O. If we have a solution containing 100g of sodium hydroxide, how much chlorine gas should we pass through the solution to make bleach?
  • 28.65g
  • 82.45g
  • 88.75g
  • 86.57g
Q.7
If 9g of aluminium reacts with 35.5g of chlorine, what is the empirical formula of the compound formed?
  • AlCl
  • AlCl2
  • AlCl3
  • Al3Cl
Q.8
A compound contains 13.5g of calcium, 10.8g of oxygen and 0.675g of hydrogen. What is its empirical formula?
  • CaOH
  • CaOH2
  • CaO2H
  • Ca(OH)2
Q.9
A reaction that could theoretically produce 200g of product only produces 140g. What is its % yield?
  • 70%
  • 14.2%
  • 142%
  • 7%
Q.10
Ammonium nitrate NH NO is used as a fertiliser. What is the % mass of nitrogen in it?
  • 21%
  • 37%
  • 17.5%
  • 35%
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