Using M3+/M2+ electrode potentials: which 3d ions are oxidising or reducing (liberate H2)

1. A.
   ${Mn}^{3 +}$
2. B.
   ${Fe}^{3 +}$
3. C.
   ${Ti}^{3 +}$
4. D.
   ${Cr}^{3 +}$

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1. A.
   ${Mn}^{2 +}$ and ${Co}^{2 +}$
2. B.
   ${Cr}^{2 +}$ and ${Co}^{2 +}$
3. C.
   $V^{2 +}$ and ${Cr}^{2 +}$
4. D.
   $V^{2 +}$ and ${Mn}^{2 +}$

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1. A.
   (B), (C) only
2. B.
   , (D) only
3. C.
   (A), (B), (D) only
4. D.
   , (B) only

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1. A.
   Both (A) and (R) are true and (R) is the correct explanation of (A)
2. B.
   Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. C.
   (A) is false but (R) is true
4. D.
   (A) is true but (R) is false

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1. A.
   0
2. B.
   2
3. C.
   3
4. D.
   1

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