# NEET Chemistry The p-Block Elements (XII) Questions Solved

Among the following statement which one is true?

(a) ${\mathrm{NH}}_{3}$ is less soluble than ${\mathrm{PH}}_{3}$ in water

(b) ${\mathrm{NH}}_{3}$ is stronger base and stronger reducing agent than ${\mathrm{PH}}_{3}$

(c) ${\mathrm{NH}}_{3}$ has higher boiling point than ${\mathrm{PH}}_{3}$ and has lower melting point than ${\mathrm{PH}}_{3}$

(d) ${\mathrm{PH}}_{3}$ is stronger reducing agent than ${\mathrm{NH}}_{3}$ and it has lower melting critical

temperature than ${\mathrm{NH}}_{3}$

(d)       ${\mathrm{NH}}_{3}$ is a weak reducing agent than ${\mathrm{PH}}_{3}$, because $\mathrm{X}—\mathrm{H}$ bond strength

decreases down the group. Due to absence of H-bonding, only weak van

der waals force of attraction exists in ${\mathrm{PH}}_{3}$, it has lower critical

temperature than ${\mathrm{NH}}_{3}$.

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