The pH values of solutions marked as A, B, C, D and E are 4, 1, 11, 7 and 9 respectively.
(i) Arrange these solutions in the decreasing order of pH.
(ii) Arrange these solutions in the increasing order of hydrogen ion concentrations.
(iii) In the list of the given solutions identify :
(a) Neutral solution
(b) Highly alkaline solution
( c) Highly acidic solution
(d) Moderately acidic solution
(e) Moderately basic solution

Explanation

To solve the question step by step, we will address each part of the question systematically.

### Step-by-Step Solution

**Given pH values:**
- Solution A: pH = 4
- Solution B: pH = 1
- Solution C: pH = 11
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