MCQ
Which of the following has highest melting point
- A$BeC{l_2}$
- B$MgC{l_2}$
- C$CaC{l_2}$
- ✓$BaC{l_2}$
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$(A)$ Upon heating, $H _3 PO _3$ undergoes disproportionation reaction to produce $H _3 PO _4$ and $PH _3$.
$(B)$ While $H _3 PO _3$ can act as reducing agent, $H _3 PO _4$ cannot.
$(C)$ $H _3 PO _3$ is a monobasic acid.
$(D)$ The $H$ atom of $P - H$ bond in $H _3 PO _3$ is not ionizable in water.
$(I)$ ${P_4} + S{O_2}C{l_2} \to $
$(II)$ ${P_4} + SOC{l_2} \to $
$(III)$ $PC{l_5} + S{O_2} \to $
$(IV)$ $PC{l_5} + {C_2}{H_5}OH \to $
