Among the given acids , strong acids are `H_(2)SO_(4),H_(2)CrO_(4),HCN,HCl` ,Phenol , `HNO_(3)`

Explanation

To determine which of the given acids are strong acids, we will analyze each acid based on its ionization in aqueous solution. Here’s a step-by-step solution:

### Step 1: Understand the Definition of Strong Acids
A strong acid is defined as an acid that completely ionizes in an aqueous solution, producing a large amount of hydrogen ions (H⁺).

### Step 2: Analyze Each Acid
Now, let's analyze the given acids one by one:

...