Observe the following reactions (i) 2 KClO ₃ (s) 2 KCl ( s )+3 O ₂ (g) (ii) 2 H ₂ O ₂ (aq) 2 H ₂ O ( l )+ O ₂( ~g ) (iii) AgNO ₃( aq )+ KCl ( aq ) AgCl ( s )+ KNO ₃( aq ) (iv) 2 Na (s) + 1 2 O ₂ (g) Na ₂ O (s) The number of redox reactions in this list is

Step-by-step solution

+1+5-2 ~K ClO ₃ ( ~s ) 2 +1-1 ~K KCl +3 0 O ₂( ~g ) Redox Reaction 2 +1 H ₂ -1 O ₂( aq ) 2 +1 H ₂ -2 O ( l )+ 0 O ₂ ( ~g ) Redox Reaction 0 2 Na ( s )+ 1 2 0 O ₂ +2 ~N a ₂ -2 O _ O ( s ) Redox Reaction +1 Ag -1 NO ₃ ( aq )+ +1-1 ~K Cl ( aq ) +1 Ag -1 Cl ( s )+ +1 ~K -1 NO ₃ ( aq ) No change in oxidation state so it is not a redox reaction. 'So' 'three' reactions are redox.