7th Class Science Acids, Bases and Salts Question Bank Acids, Bases and Salts

  • question_answer DIRECTIONS: Read the following three statements and choose the correct answer. (i) Phenolphthalein is a natural indicator. (ii) Sodium carbonate is commonly known as caustic soda. (iii) Universal indicator is made up of a mixture of different dyes.

    A) Statement (i) and (iii) are incorrect but (ii) is correct

    B) Statement (i) and (ii) are incorrect but (iii) is correct

    C) All statements are correct

    D) All statements are incorrect

    Correct Answer: B

    Solution :

    Phenolphthalein is a synthetic indicator. M Caustic soda is sodium hydroxide. Sodium carbonate is called washing soda.


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