Identification of cations can also be done using a dry test called ...

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Identification of cations can also be done using a dry test called sodium carbonate-bead test which is similar to borax-bead test.
. Identify \( A \), and what is the hybridization of \( A \) ?
(a) \( \mathrm{Na}_{2} \mathrm{MnO}_{4}, d^{3} s \)
(b) \( \mathrm{NaMnO}_{4}, s p^{3} \)
(c) \( \mathrm{Mn}_{2} \mathrm{O}_{7}, d^{3} s \)
(d) \( \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, d^{3} s \)
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