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

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    DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Study the following chart and Identify 'A' and 'B'.             A                                                          B

    A) Sodium hydroxide                               Sodium chloride

    B) Hydrochloric acid                                Sodium hydroxide

    C) Sodium hydroxide acid                                    Aluminum hydroxide

    D) Hydrochloric acid                                Sodium chloride

    Correct Answer: B

    Solution :

    Phenolphthalein is colorless in acidic medium (hydrochloric acid) and shows pink colour in basic medium (sodium hydroxide).


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