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previous paper Eight (8th)

Previous paper class 8th(Science)

Q. no. 1: Encircle the correct answer.

  1. Acids react with metal hydroxides to form
    A.salt and hydrogen gas
    B.salt and water
    C.salt and alkali
    D.hydrogen and oxygen
    2.. When methyl orange indicator is added to a basic solution, the solution turns _.
    A.colorless
    B.blue
    C.yellow
    D.brown
  2. Indicators are substances whose solutions change colour due to changes in _.
    A.pH
    B.temperature
    C.density
    D.pressure
  3. HCl+NaOH→NaCl+H2O What is the type of this reaction?
    A.Elimination reaction
    B.Neutralisation reaction
    C.Single displacement reaction
    D.Combustion
  4. When a few drops of phenolphthalein indicator are added to an acidic solution, the
    solution turns _.
    A.blue
    B.colorless
    C.violet
    D.light pink
    6.Zn+H2SO4→?Which of the following gases releases?
    A.O2
    B.SO2
    C.H2S
    D.H2