MCQ
Heating white phosphorus with conc. $NaOH$ solution gives mainly
- A$Na _{3} P$ and $H _{2} O$
- B$H _{3} PO$ and $NaH$
- C$P ( OH )_{3}$ and $NaH _{2} PO _{4}$
- ✓$PH _{3}$ and $NaH _{2} PO _{2}$
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Precipitate $X$ is
$(A)$ $Fe _4\left[ Fe ( CN )_6\right]_3$
$(B)$ $Fe \left[ Fe ( CN )_6\right]$
$(C)$ $K _2 Fe \left[ Fe ( CN )_6\right]$
$(D)$ $KFe \left[ Fe ( CN )_6\right]$
Among the following, the brown ring is due to the formation of
$(A)$ $\left[ Fe ( NO )_2\left( SO _4\right)_2\right]^{2-}$
$(B)$ $\left[ Fe ( NO )_2\left( H _2 O \right)_4\right]^{3+}$
$(C)$ $\left[ Fe ( NO )_4\left( SO _4\right)_2\right]$
$(D)$ $\left[ Fe ( NO )\left( H _2 O \right)_5\right]^{2+}$


