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10th Class Science Sample Paper Science Olympiad Model Test Paper-9

  • question_answer
    A blue litmus paper was first dipped in dil. \[HCI\]and then in dil. \[NaOH\]solution. It was observed that the colour of the litmus paper:

    A) Changed to red.

    B) Changed first to red and then to blue.

    C) Changed blue to colourless.

    D) remained blue in both the solutions.

    E) None of these

    Correct Answer: B

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