10 - Science - 11. Chemistry – Chemical Reactions

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10 - Science - 11. Chemistry  Chemical Reactions

Prepared By Mr. S. Ravikumar, B. T. Asst. , GHS, Arangaldhurgam, Vellore District.   ; &nbs p; & www. Padasalai. Net


Questions and Answers
  • 1. 
    Zn + 2HCl → ZnCl2 + H2 ↑  The above reaction is an example of _________
    • A. 

      Combination reaction

    • B. 

      Double displacement reaction

    • C. 

      Displacement reaction

    • D. 

      Decomposition reaction

  • 2. 
    A reddish brown coloured element ‘X’ on heating in air becomes black coloured compound ‘Y’. X and Y are______ and ________
    • A. 

      Cu, CuO

    • B. 

      Pb, PbO

  • 3. 
    A student tested the pH of pure water using a pH paper. It showed green colour. If a pH paper is used after adding lemon juice into water, what color will he  observe?
    • A. 

      Green

    • B. 

      Red

    • C. 

      Yellow

  • 4. 
    Chemical volcano is an example of _____________
    • A. 

      Combination reaction

    • B. 

      Decomposition reaction

  • 5. 
    When crystals of lead nitrate on heating strongly produces a ____ (NO2 / CO2) gas and the colour of the gas is _________ (reddish brown/ white)
    • A. 

      NO2, reddish brown

    • B. 

      CO2, reddish brown

    • C. 

      NO2, white

    • D. 

      CO2, white

  • 6. 
    When aqueous solution of silver nitrate and sodium chloride are mixed _______ precipitate is immediately formed. (white / yellow / red)
    • A. 

      White

    • B. 

      Yellow

    • C. 

      Red

  • 7. 
    Zinc can displace aluminium metal from aqueous solution of aluminium sulphate.
    • A. 

      Zinc is more reactive than aluminium

    • B. 

      Aluminium is more reactive than zinc

  • 8. 
    To protect tooth decay, we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is ______ in nature.
    • A. 

      Acidic

    • B. 

      Basic

  • 9. 
    Vinegar is present in acetic acid. Curd contains _____ acid.
    • A. 

      Lactic acid

    • B. 

      Tartaric acid

  • 10. 
    PH = - log10 [H+]. The pH of a solution containing hydrogen ion concentration of 0.001M solution is _____
    • A. 

      3

    • B. 

      11

    • C. 

      14