At `90^(@)` C, pH of an aq . Solution of a strong electrolyte is 7 . What is the nature of electrolyte ?

Options

A. neutral
B. basic
C. acidic
D. none

Answer

To determine the nature of the strong electrolyte given that the pH of its aqueous solution at 90°C is 7, we can follow these steps:

### Step 1: Understand the pH scale
The pH scale ranges from 0 to 14, where:
- pH < 7 indicates an acidic solution
- pH = 7 indicates a neutral solution
- pH > 7 indicates a basic solution

### Step 2: Analyze the given pH value
In this case, the pH is given as 7. This indicates that the solution is neutral at 90°C.

### Step 3: Consider the nature of strong electrolytes
Strong electrolytes are substances that completely dissociate into ions in solution. Common examples include strong acids (like HCl) and strong bases (like NaOH).

### Step 4: Determine the implications of a neutral pH
Since the pH is neutral (7), it suggests that the concentration of hydrogen ions [H⁺] is equal to the concentration of hydroxide ions [OH⁻]. This means that the solution does not exhibit acidic or basic properties.

### Step 5: Conclude the nature of the electrolyte
Given that the solution is neutral and the pH is 7, we can conclude that the strong electrolyte in question must be a neutral salt. Neutral salts do not affect the pH of the solution when dissolved in water, as they do not produce excess H⁺ or OH⁻ ions.

### Final Answer
The nature of the electrolyte is neutral.

---