In which of the following options are the product gases $X$ and $Y$ (other than water vapour) the same?
- A$Mg_2C_3 + H_2O \to X$; $Al_4C_3 + H_2O \to Y$
- B$NH_4NO_3 \xrightarrow{\Delta} X$; $(NH_4)_2Cr_2O_7 \xrightarrow{\Delta} Y$
- C$NH_4Cl \xrightarrow{NaOH(aq.)} X$; $NaNO_3 \xrightarrow{Al/NaOH(aq.)} Y$
- D$Cu + dil. HNO_3 \to X$; $Ag + dil. HNO_3 \to Y$
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$(II)$ The basicity of $H_3PO_3$ is $3$.
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$(II)$ The basicity of $H_3PO_3$ is $3$.
$(III)$ In gas phase,all $P-Cl$ bonds of $PCl_5$ have same bond length.
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