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9th Class Science Is Matter Around Us Pure Question Bank Is Matter Around us Pure

  • question_answer
    Two substances \[P\] and \[Q\] when brought together, form substance \[R\] with the evolution of heat. The properties of \[R\] are different from both \[P\] and\[Q\]. What is substance\[R\]?

    A)  A compound  

    B)         An element

    C)  A metal           

    D)         A mixture

    Correct Answer: A

    Solution :

     Substances \[P\] and \[Q\] are elements. When they combine, form a new substance called \[R\] which is a compound. Substance \['R'\] is a compound as the properties of \['P'\] and \['Q'\] are not retained by \['R'\] during its formation.


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