Chemistry
State which of the following are oxidation reactions and which are reduction reactions.
(a) (i) Cu ⟶ Cu2+ + 2e-
(ii) Cu2+ + 2e- ⟶ Cu
(iii) Sn4+ + 2e- ⟶ Sn2+
(iv) 2Cl- ⟶ Cl2 + 2e-
(v) Fe2+ ⟶ Fe3+ + 1e-
(vi) X + 2e- ⟶ X2-
(vii) Y - 1e- ⟶ Y1+
(viii) Z3+ + 1e- ⟶ Z2+
(b) (i) Zn ⟶ Zn2+
(ii) S ⟶ S2-
(iii) Sn2+ ⟶ Sn
(iv) Fe2+ ⟶ Fe3+
Answer
(a) (i) Cu ⟶ Cu2+ + 2e- — Oxidation Reaction
(ii) Cu2+ + 2e- ⟶ Cu — Reduction Reaction
(iii) Sn4+ + 2e- ⟶ Sn2+ — Reduction Reaction
(iv) 2Cl- ⟶ Cl2 + 2e- — Oxidation Reaction
(v) Fe2+ ⟶ Fe3+ + 1e- — Oxidation Reaction
(vi) X + 2e- ⟶ X2- — Reduction Reaction
(vii) Y - 1e- ⟶ Y1+ — Oxidation Reaction
(viii) Z3+ + 1e- ⟶ Z2+ — Reduction Reaction
(b) (i) Zn ⟶ Zn2+ Oxidation Reaction
(ii) S ⟶ S2- — Reduction Reaction
(iii) Sn2+ ⟶ Sn — Reduction Reaction
(iv) Fe2+ ⟶ Fe3+ — Oxidation Reaction
Related Questions
Explain the terms 'oxidation' and reduction' with reference to an atom or ion.
State three differences between 'X' and 'X1+' i.e. an atom and an ion.
Fill in the blanks with appropriate word/s from the brackets :
NaCl an electrovalent compound is formed as a result of transfer of …………… (one, two, three) valence electrons from metallic sodium to non-metallic chlorine atom. CaO is similarly formed as a result of transfer of …………… (one, two, three) valence electron/s from metallic calcium to non-metallic oxygen and magnesium chloride by transfer of …………… (one, two, three) valence electron/s from …………… (one, two) magnesium atom/s to …………… (one, two) chlorine atom/s.
Explain with the help of :
(i) an ionic equation
(ii) electron dot structural diagram
the formation of the following :
(a) Sodium chloride
(b) Calcium oxide
(c) Magnesium chloride.
(at. nos. Na = 11, Cl = 17, Ca = 20, O = 8, Mg = 12)