Question

There are three bottles labelled as A, B and C contain weak acid, strong acid and strong base in random order. All are monobasic/monoacidic. A student performs some experiment then the following observations are made.
(A) When solution 'A' and 'B' are mixed completely then it form buffer of $pH=4.7$
(B) When 'B' and 'C' mixed completely then solution will have remaining strong acid along with neutral salt.
(C) When 'A' and 'C' solutions are mixed completely then the resultant solution is acidic and pH of solution is $2-\log 5$
32. The bottles (A), (B) and (C) contain the solutions which are respectively :

• A. Weak acid, strong base and strong acid
• B. Strong base, weak acid and strong acid
• C. Strong acid, weak acid and strong base
• D. Strong acid, strong base and weak acid

Answer 1

The correct option is A Weak acid, strong base and strong acid

(A) Weak acid and strong base mixture is forming buffer of $pH=4.7$.
(B) Strong acid and strong base mixture can from neutral salt.
(C) Strong acid and weak acid mixture will from acidic solution.
So A, B and C must be weak acid, strong base and strong acid respectively.