Problem: Indicate whether each of the following statements is True or False and explain why.a) Chromium metal can dissolve in dilute HCl.b) Iron metal will reduce Fe3+ to Fe2+.c) Silver metal will dissolve in nitric acid, liberating H2 gas.d) Oxygen in moist air can oxidize Fe2+ to Fe3+.

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Indicate whether each of the following statements is True or False and explain why.


a) Chromium metal can dissolve in dilute HCl.

  • Larger (↑) E° → reduction
  • Cr3+(aq) + 3e - → Cr(s)  E° = -0.74 V 
  • HCl is strong so it produces H+.
  • 2 H+(aq) + 2e - → H2(g)  E° = 0 V 
  • Since E° of Cr3+ is less than for H+,  2 H+(aq) + 2e - → H2(g) is reduction.
  • So Cr3+(aq) + 3e - → Cr(s) will be reversed to be an oxidation reaction and the redox reaction would proceed.


True, Chromium metal can dissolve in dilute HCl.


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Problem Details

Indicate whether each of the following statements is True or False and explain why.

a) Chromium metal can dissolve in dilute HCl.

b) Iron metal will reduce Fe3+ to Fe2+.

c) Silver metal will dissolve in nitric acid, liberating H2 gas.

d) Oxygen in moist air can oxidize Fe2+ to Fe3+.

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