Q.1
A compound is a substance which contains .......
  • only one type of atom
  • only two types of atom
  • two or more chemicals which can be easily separated
  • two or more elements chemically joined together
Q.2
The number of different elements in calcium carbonate (CaCO ) is .......
  • 2
  • 3
  • 4
  • 5
Q.3
Which of the following could have been formed by reacting iron with sulfur?
  • Iron oxide
  • Sulfuric iron
  • Iron sulfide
  • Sulphuric acid
Q.4
The formula of methane is CH . Which of these is true?
  • A molecule of methane contains five atoms
  • A molecule of methane contains five different elements
  • An atom of methane contains two different elements
  • Methane contains five molecules
Q.5
Which of these is NOT a compound?
  • Carbon monoxide
  • Chlorine
  • Hydrochloric acid
  • Propane
Q.6
How many atoms in the formula CuSO ?
  • 3
  • 4
  • 6
  • 7
Q.7
The correct formula for carbon tetrachloride is .......
  • C3Cl
  • C4Cl
  • CCl3
  • CCl4
Q.8
The smallest particle of carbon dioxide (CO ) that still has the properties of carbon dioxide is called .......
  • a molecule
  • a proton
  • an atom
  • an ion
Q.9
Which of these word equations is INCORRECT?
  • Copper + oxygen → copper oxide
  • Hydrogen + chlorine → hydrogen chlorine
  • Iron + chlorine → iron chloride
  • Magnesium + oxygen → magnesium oxide
Q.10
Which is the correct formula equation?
  • Mg + O → MgO
  • Mg + O2 → MgO2 →
  • 2 Mg + O2 → Mg2O2
  • 2 Mg + O2 → 2 MgO
0 h : 0 m : 1 s