a)Which metal will react spontaneously with a Cr3+ ion but not with a Ca2+ ion? * a Co b Li c Pb d Mg e All will react the same

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a)Which metal will react spontaneously with a Cr3+ ion but not with a Ca2+ ion? *

a

Co

b

Li

c

Pb

d

Mg

e

All will react the same

 

b)During the reaction below, electrons transfer from:

MnO4- + 5Fe2+ + 8H+ ­→ Mn2+ + 5Fe3+ + 4H2O 

a

Fe3+ to Fe2+

b

Fe2+ to MnO4-

c

MnO4- to Fe2+

d

MnO4- to Mn2+

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