1.

The pH of the solution is 4. The hydrogen ion concentration of the solution in mol/litre is               [UPSEAT 2000]

A.                 9.5         
B.                 \[{{10}^{-4}}\]
C.                 \[{{10}^{4}}\]    
D.                 \[{{10}^{-2}}\]
Answer» C.                 \[{{10}^{4}}\]    


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