MCQ
Monazite is source of
- ✓$He$
- B$Kr$
- C$Ar$
- D$Ne$
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(image) $\xrightarrow[{N{H_4}Cl}]{{Zn}}.....?$

$(A)$ $H _2 S _2 O _7$ $(B)$ $H _2 S _2 O _8$ $(C)$ $H _2 S _2 O _5$ $(D)$ $H _2 SO _5$