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9
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Question 9 • Chemistry

Considering the activity series given for metals and nonmetals, which reaction will occur? Al is greater than Mn comma Mn is greater than Zn comma Zn is greater than Cr comma Cr is greater than Fe comma Fe is greater than Cd comma Cd is greater than Co comma Co is greater than Ni comma Ni is greater than Sn comma Sn is greater than Pb comma Pb is greater than cap h comma cap h is greater than Sb comma Sb is greater than Bi comma Bi is greater than Cu comma Cu is greater than Ag comma Ag is greater than Pd comma Pd is greater than Hg comma Hg is greater than Pt cap f is greater than Cl comma Cl is greater than Br comma Br is greater than cap i

Answer
A
2 Fe plus Al sub 2 cap o sub 3 rightarrow 2 Al plus Fe sub 2 cap o sub 3
B
2 AgNO sub 3 plus Ni rightarrow Ni open paren NO sub 3 close paren sub 2 plus 2 Ag
C
Pb plus Zn open paren cap c sub 2 cap h sub 3 cap o sub 2 close paren sub 2 rightarrow Zn plus Pb open paren cap c sub 2 cap h sub 3 cap o sub 2 close paren sub 2
D
2 NaBr plus cap i sub 2 rightarrow 2 NaI plus Br sub 2

Explanation

A metal higher in the activity series can replace a metal below it in a compound. Nickel is above silver, so Ni can replace Ag in silver nitrate, producing nickel nitrate and silver. In B, iodine is below bromine, so it cannot replace bromine. In C and D, the free metal is less active than the metal it would need to replace, so those reactions will not occur as written.

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