Which of the following statement is Correct

  • A

    $Ce^{+4}$ act as oxidising as well as reducing agent

  • B

    Pure $PH_3$ is produced by heating of $PH_4I$ with dil. $CH_3COOH$

  • C

    Urea, sulphamic acid and thiourea are used to destroy nitrate ion

  • D

    Titration of boric acid solution is not satisfactory with $NaOH$ solution

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