Beilstein Test is given by which of these compounds (a) \( \mathrm{CuF}_{2} \) (b) \( \mathrm{Cu...

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Beilstein Test is given by which of these compounds
(a) \( \mathrm{CuF}_{2} \)
(b) \( \mathrm{CuCl}_{2} \)
(c) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~N} \)
(d) Thiourea
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