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7th Class Science Acids, Bases and Salts / अम्ल, क्षार एवं लवण Question Bank Acids Bases and Salts

  • question_answer
    Rima prepared an indicator paper by dipping a paper strip in a solution of X. She put a few drops of an unknown solution Y which contains \[{{H}^{+}}\] ions less than \[O{{H}^{-}}\] ions on this paper. She observed that the colour of paper turned yellow. What do you think was solution X?

    A)  Red litmus solution

    B)  Phenolphthalein

    C)  Methyl orange

    D)  Turmeric solution

    Correct Answer: C

    Solution :

    'Y' is basic solution as it contains \[{{H}^{+}}\] ions less than \[O{{H}^{-}}\] ions. Methyl orange turns yellow in basic solution. Red litmus solution turns blue, phenolphthalein turns pink and turmeric solution turns red in basic solution.


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