Which of the following statements is correct?

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(D) $1$. $Ce^{+4}$ is a strong oxidising agent because it easily reduces to $Ce^{+3}$. It does not act as a reducing agent.$2$. Pure $PH_3$ is prepare

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

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(D) $1$. $Ce^{+4}$ is a strong oxidising agent because it easily reduces to $Ce^{+3}$. It does not act as a reducing agent.$2$. Pure $PH_3$ is prepared by heating $PH_4I$ with a strong base like $KOH$ or $NaOH$,not $CH_3COOH$.$3$. Urea,sulphamic acid,and thiourea are used to destroy nitrite ions $(NO_2^-)$,not nitrate ions $(NO_3^-)$.$4$. Boric acid is a very weak acid $(K_a \approx 5.8 	imes 10^{-10})$,and its titration with $NaOH$ is not satisfactory because the end point is not sharp. It requires the addition of polyols like glycerol to form a strong complex acid.

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