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5. Which of the following metals can be oxidized by Co2 (aq)? (a) Chromium (b) Manganese (c) Nickel (d) Answers (a) and (b) (
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Answer #1


according to the electro chemical series

the order is as follows

manganese

chromium

nickel

so here the Co2+ can oxidizes the both chromium and the manganese

answer => d) both a and b

6) according to the solubility rule

a) Cus => insoluble ( all sulfides are insoluble except Na+ , K+ NH4+ )

b) Pb(NO3)2 => soluble ( all nitrates are soluble)

c) ZnCO3 => insoluble ( all carbonates are insoluble except Na+ , K+ NH4+ )

answer => b

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