Railways General Science & Technology Acids, Bases and Salts / अम्ल, क्षार एवं लवण Sample Paper Acids and Bases Sample Test Paper-16

  • question_answer
    A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish orange. Which of the following would change the colour of this pH paper to greenish-blue?

    A)  Lemon juice     

    B)  An antacid

    C)  Common salt   

    D)  Vinegar

    Correct Answer: B

    Solution :

    [b] An antacid is basic in nature and hence changes the colour of pH paper to greenish blue.

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