Balance the following redox reactions the elements

Question

Assignment

1. Find the oxidation number for:

P atom in H₃PO₂
P atom in H₃PO₃
P atom in PO₄^2-
S atom in H₂SO₄
S atom in SO₃^2-
Cr atom in K₂Cr₂O₇

2. Balance the following redox reactions (the elements undergoing a change in the oxidation number are in bold + italics):

0       7+                       4+                     2+
C + KMnO₄ + H₂SO₄ → CO₂ + K₂SO₄ + MnSO₄ + H₂O

4+        0      0      1+
TiCl₄ + Na → Ti + NaCl

2. For each reaction above, identify the oxidizing reagent and the reducing agent

Reaction 1: C is ______________ and KMnO₄ is ______________
Reaction 2: TiCl₄ is ______________ and Na is ______________