A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be :
(1) baking soda solution
(2) washing soda solution
(3) caustic soda solution
(4) household ammonia solution

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Solution

A universal indicator takes the color of the solution to the blue-violet region if it is a base. As universal indicator turns the color of the given solution to violet, that's why the given solution is a base. Out of the given options, caustic soda is the strongest base and will violet color with universal indicator.

Hence, the correct answer is option 3.

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A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be : (1) baking soda solution (2) washing soda solution (3) caustic soda solution (4) household ammonia solution

A student was given an unknown solution in a test-tube. When he added universal indicator to the test-tube, the solution turned violet. The unknown solution is most likely to be :
(1) baking soda solution
(2) washing soda solution
(3) caustic soda solution
(4) household ammonia solution