6. (i) Define a universal indicator. Mention its one use.
(ii) Solution A gives pink colour when a drop of phenolphthalein indicator is
added to it. Solution B gives red colour when a drop of methyl orange is
added to it. What type of solutions are A and B and which one of the
solutions A and B will have a higher pH value?
(iii) Name one salt whose solution has pH more than 7 and one salt whose
solution has pH less than 7.
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6.(i) Universal indicator is a solution of many indicators which shows different colour changes for solutions with different pH values . it is used to predict the nature of solution.
(ii) Solution A has higher pH value
(iii) sodiumcarbonate has pH value more than 7 and Ammonium chloride has pH less than 7