Answers Assignment 6 - Chemical Reactions and Equations | Class 10th

Answers Assignment – 6

Chemical Reactions and Equations

Ans 35. (i) Ferrous sulphate (FeSO₄)

(ii) Decomposition reaction.

(iii) Ferric oxide (Fe₂O₃)

(iv) Sulphur dioxide (SO₂)

(v) 2 FeSO₄(s) + heat  →  Fe₂O₃(s) + SO₂(g) + SO₃ (g) 

          

Ans 36. Converted equations are:

        

  

Ans 37. Balanced equations are:

          

Ans 38. (i) Nitrogen dioxide (NO₂).  

          (ii) 2 Pb(NO₃)₂(s)  +  heat →  2 PbO(s) + 4 NO₂(g) + O₂(g) 

          (iii) Lead monoxide (PbO).

Ans 39. Respiration is oxidation of food, during this process, energy is released as given in the following equation. 

              C₆H₁₂O₆ + 6 O₂   →    6 CO₂ + 6 H₂O + energy 

Thus, it is an exothermic reaction.

Ans 40. Fe₂O₃(s) + 2 Al(s) → Al₂O₃(s) + 2 Fe(s) 

Use - To weld/join railway tracks.

Ans 41. A yellow precipitate of lead iodide is formed.  

Ans 42. (i) 2 NaCl (aq) + Current  →  2 Na(s) + Cl₂(g) 

(ii) Mg(s) + 2 HCI(aq)    →  MgCl₂(s) + H₂(g) 

(iii) KCIO₃(s)  +  heat    →   KCI(s) + O₂ (g) 

(IV) BaCl₂(aq) + Na₂SO₄(aq)  →   BaSO₄(s) + 2 NaCl(aq)

(V) Fe(s) + CuSO₄(aq) →  FeSO₄(aq) + Cu(s)