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20mL of calcium hydroxide was consumed w...

`20`mL of calcium hydroxide was consumed when it was reacted with `10mL`of unknown solution of `H_2SO_4` Also `20`ml standard solution of `0.5 M HCl ` containing 2 drops of phenolphthalein was titrated the with calcium hydroxide , the mixture showed pink colour when burette displayed the value of `35.5`mL whereas the burette showed `25.5`mL initially. The concentration of `H_2SO_4` is ____M: (Nearest integer)

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