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You have four solutions A, B, C and D. The pH of solution A is 6,B is 9, C is 12 and, D is 7,

(a) Identify the most acidic and most basic solutions.

(b) Arrange the above four solutions in the increasing order of H+ ion concentration.

(c) State the change in colour of pH paper on dipping in solution C and D.

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(a) Most acidic - A, Most basic - C

(b)C,B,D,A/C<B<D<A

(c) In C- blue, In D- green

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