A student was given two test-tubes A and B each containing a colourless solution. When a few drops of universal indicator were added to the two test-tubes, one by one, then the colour of solution in test-tube A changed to blue whereas the colour of solution in test-tube B changed to orange.
(a) Which test-tube has a solution of pH higher than 7?
(b) Which test-tube has a solution of pH lower than 7?
(c) Which test-tube has an acidic solution?
(d) Which test-tube has an alkaline solution?
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Answer:
a) test tube A
b) test tube B
c) test tube B
d) test tube A
hint:
in acidic solution, blue litmus change to red colour.
in basic solution, red litmus change to blue colour.
PH is less than 7 for acidic solution.
PH is greater than 7 for basic solution.
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