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

  • question_answer
    Observe the given reaction carefully and fill in the blanks by choosing an appropriate option.
    \[F{{e}_{(s)}}+CuS{{O}_{4(aq)}}\to FeS{{O}_{4(aq)}}+C{{u}_{(s)}}\]
    Before reaction, iron is ___(i)___ in colour and solution is ___(ii)___ in colour. After reaction iron gets ___(iii)___ deposits and the solution becomes ___(iv)___ in colour.
     

    A)
    (i) (ii) (iii) (iv)
     Grey Colourless Red Blue 
                   

    B)
    (i) (ii) (iii) (iv)
     Red Blue Grey Green
                   

    C)
    (i) (ii) (iii) (iv)
     Grey Blue Brown Green
                   

    D)
    (i) (ii) (iii) (iv)
     Red Colourless Grey Green
     

    Correct Answer: C

    Solution :

    \[\underset{(Grey)}{\mathop{F{{e}_{(s)}}}}\,+\underset{(Blue)}{\mathop{CuS{{O}_{4(aq)}}}}\,\to \underset{(Green)}{\mathop{FeS{{O}_{4(aq)}}}}\,+\underset{(Brown)}{\mathop{C{{u}_{(s)}}}}\,\]                


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