7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    DIRECTIONS: On the basis of following diagram/picture answer the questions given below: What causes the candle flame to get extinguished?

    A) Evolution of \[{{\text{O}}_{\text{2}}}\] gas

    B) Evolution of \[\text{C}{{\text{O}}_{\text{2}}}\] gas

    C) Formation of \[\text{Ca}{{\left( \text{OH} \right)}_{\text{2}}}\]

    D) Formation of \[\text{CaC}{{\text{l}}_{\text{2}}}\]

    Correct Answer: B

    Solution :

     \[\text{CaC}{{\text{O}}_{\text{3}}}\text{+2HCl}\xrightarrow{{}}\text{CaC}{{\text{l}}_{\text{2}}}\text{+}{{\text{H}}_{\text{2}}}\text{O+C}{{\text{O}}_{\text{2}}}\]


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