The chemical formula of Calcium Chloride is-
  • CaCl2
  • Ca2Cl
  • CaCl
  • None
Which of the following is not a pure substance?
  • Iron
  • Rain water
  • Air
  • Oxygen gas
The symbol of carbonate ion is -
  • CO3
  • CO3-2
  • CO2-3
  • CO32+
When iron rod is dipped in copper sulphate solution the following observations can be observed-
  • The change of colour of solution from red to blue and brown coating on iron nail
  • The change of colour of solution from green to blue and grey coating on iron nail.
  • The change of colour of solution from blue to green and brown coating on iron nail
  • The change of colour of solution from blue to green and black coating on iron nail
Which of the following is not a chemical change?
  • Photosynthesis
  • Digestion of food
  • Respiration in plants and animals
  • Breaking of glass
The products of Neutralisation reaction are-
  • Acid, water
  • Base, salt
  • Base, water
  • Salt, water
Fe (s) + CuSO4 -> FeSO4 + Cu. This is _____ reaction.
  • Addition reaction
  • Displacement reaction
  • Decomposition reaction
  • Neutralisation reaction
Iron get rusted in coming in contact with-
  • Air and soil
  • Water and sunlight
  • Oxygen and animals
  • Air and moisture
The chemical formula of sodium is.
  • So
  • No
  • Na
  • Sd
Equation having same no. of atoms of each element on both the sides is called-
  • Chemical equation
  • Chemical reaction
  • Balanced chemical equation
  • Chemical formula
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