Are the following reactions-redox or not? Explain: (1) H₂S (aq)+ Cl₂ (aq) --> S (g) + Cl⁻ (aq) (2) 2Na (g) + Cl₂ (g) --> 2NaCl (s) (3) FeSO₄ (aq) + Mg (s) --> MgSO₄ (aq) + Fe (s) (4) Cu (s) + 4HNO₃ (aq) --> Cu(NO₃)₂ (aq) + 2NO₂ (g) + 2H₂O (l)
Answers
A redox that is oxidation-reduction reaction, is a typical of chemical reaction that involves a transfer of electrons between two elements.(1)H₂S (aq)+ Cl₂ (aq) --> S (g) + Cl⁻ (aq)
3It is a redox reaction.H2S is reduced to form elemental Sulphur.Cl is oxidised to produce HCl.(2)2Na (g) + Cl₂ (g) --> 2NaCl (s)
It is a example of synthesis reaction. Here two elements Na and Cl2 are forming a compound Na Cl.(3) FeSO₄ (aq) + Mg (s) --> MgSO₄ (aq) + Fe (s)It isa redox reaction.
FeSO4 is reduced to metallic state Fe whereas Mg is oxidized to MgSO4
.Step 1: An increase in oxidation number of the chemical species is called its oxidation.
Note that Mg (Solid state, oxidation number = 0)
is being oxidized to Mg2+ (Oxn. No. of Mg in MgSO4 = +2). Mg(s) ----->Mg2+ + 2e. Cu (s) + 4HNO₃ (aq) -->Cu(NO₃)₂ (aq) + 2NO₂ (g) + 2H₂O (l)
yes some of the given are Redox