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In the reaction,
P
\[
\mathrm{Zn}+\mathrm{HNO}_{3} \rightarrow \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}+\mathrm{NO}+\mathrm{H}_{2} \mathrm{O} \text {, }
\]
W
the equivalent weight of \( \mathrm{HNO}_{3} \) is
(1) \( \mathrm{M} \)
(2) \( 4 \mathrm{M} / 3 \)
(3) \( 8 \mathrm{M} / 3 \)
(4) \( 2 \mathrm{M} / 3 \)
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