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

  • question_answer
    Sumedha took a spoon of turmeric powder and made a paste by adding little water to it. She cut thin strips of a paper and applied this paste on them. After drying she put few drops of given sample solutions (i)-(iv) on these strips. What would be the changes in the colour she observed?
    (i) Amia Juice            
    (ii) Lime water         
    (iii) Common salt solution
    (iv) Baking soda solution

    A)
    (i) (ii) (iii) (iv)
     Yellow Red Yellow Red

    B)
    (i) (ii) (iii) (iv)
     Red Yellow Yellow Red

    C)
    (i) (ii) (iii) (iv)
     Red Red Yellow Yellow

    D)
    (i) (ii) (iii) (iv)
     Yellow Yellow Red Red

    Correct Answer: A

    Solution :

    Turmeric strip turns red in basic solutions like lime water \[(Ca{{(OH)}_{2}})\]and baking soda solution \[(NaHC{{O}_{3}})\]. It remains yellow in acidic solutions like amia juice as well as in neutral solutions like common salt solution.


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