Which statement is true about a basic solution?
Its pH is equal to 7.
Its pH is less than 7.
It has the same concentration of hydronium and hydroxide ions.
It has a greater concentration of hydroxide ion than hydronium ions.

pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14. If the pH is less than 7 then the solution is acidic in nature. If the pH is more than 7 then the solution is basic in solution. If the pH is equal to 7 then the solution is neutral in nature.

Now check all statement one by one.

In statement 1, it is given that pH is equal to 7 that means it is neutral in nature not basic in nature. So statement 1 is incorrect
In statement 2, it is given that pH is less than 7 that means it is acidic in nature not basic in nature. So statement 2 is incorrect.
In statement 3, it is given that it has the same concentration of hydronium and hydroxide ions that means it is neutral solution not basic solution. So statement 3 is incorrect.
In statement 4, it is given that it has a greater concentration of hydroxide ion than hydronium ions that means it is basic solution. So statement 4 is correct.

Thus, from above conclusion we can say that statement 4 (It has a greater concentration of hydroxide ion than hydronium ions) is true about a basic solution.

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Which statement is true about a basic solution? Its pH is equal to 7. Its pH is less than 7. It has the same concentration of hydronium and hydroxide ions. It has a greater concentration of hydroxide ion than hydronium ions.

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Which statement is true about a basic solution?
Its pH is equal to 7.
Its pH is less than 7.
It has the same concentration of hydronium and hydroxide ions.
It has a greater concentration of hydroxide ion than hydronium ions.