Which of the following statements is correct?

CHEMISTRY · Single correct · ICSE · Chemistry · Metallurgy · Metallurgy

Problem

Which of the following statements is correct? (1) The chief ore of zinc is cinnabar. (2) MacArthur's process is used to extract silver. (3) Na2S2O3\text{Na}_2\text{S}_2\text{O}_3 is used to remove unexposed AgBr\text{AgBr} from photographic films. (4) Nessler's reagent is a complex of zinc in the +2+2 oxidation state.

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