MCQ
Maximum number of $P-H$ bond $(s)$ are there in a molecule of
- AOrthophosphorous acid
- BPyrophosphoric acid
- ✓Pyrophosphorous acid
- DHypophosphoric acid
$(2)$. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7} \rightarrow$ no $\mathrm{P}-\mathrm{H}$ bond.
$(3)$. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5} \rightarrow$ two $\mathrm{P}-\mathrm{H}$ bond.
$(4)$. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6} \rightarrow$ no $\mathrm{P}-\mathrm{H}$ bond
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$(A)\,Cu$ $(II)$ complexes are always paramagnetic
$(B)\,Cu$ $(I)$ complexes are generally colourless
$(C)\,Cu$ $( I )$ is easily oxidized
$(D)$ In Fehling solution, the active reagent has $Cu$ $( I )$
$E_{F{e^{2 + }}/Fe}^o\, = \, - \,0.44\,\,V\,;\,\,E_{Z{n^{2 + }}/Zn}^o\, = \, - \,0.76\,\,V\,;\,$
$E_{C{u^{ + 2}}/Cu}^o\, = \,0.34\,\,V$
Based on this data, which of the following is the strongest reducing agent ?
$'X'\,\,\xrightarrow{{water}}$ Insoluble
$'X'\xrightarrow{{5\% \,HCl}}$ Insoluble
$'X'\xrightarrow{{10\% \,NaOH}}$ Insoluble
$'X'\xrightarrow{{10\% \,NaHC{O_3}}}$ Insoluble