Question

02
. Balance the following equations :
(i) Na+ 02→Na2O
(ii) H2O2 → H2O + O2
(iii) Mg(OH)2 + HCl → MgCl2 + H2O
(iv) Fe + O2 →Fe2O3
(v) Al(OH)3→Al2O3 + H2O
(vi) NH3 + CuO - Cu → Cu + N₂+HO
(vii) Al2(SO4)3 + NaOH→Al(OH)3 + Na2SO4
(viii) HNO3Ca(OH)2→Ca(NO3)2+ H2O
(ix) NaOH +H2SO4→Na2SO4 + HO
(x) BaCl2 +H2SO4→BaSO4 + HCI


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Answer 1

Answer:

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(i)Na+ 02→Na2O

• The givcen equation is: Na + O2 → Na2O.The Na and O both are not balanced, so balanced equation by hit and trial method will be:
• 4Na + O2 → 2Na$a_2$O.

(ii) H2O2 → H2O + O2

• 2H2O2→2H2O+O2

Add 2 molecules of hydrogen peroxide and 2 molecules of water. This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen. According to the law of conservation the reaction should be balanced.

(iii) Mg(OH)2 + HCl → MgCl2 + H2O

• Mg(OH)2 + 2HCl → MgCl2 + 2H2O

Answer 2

Answer:

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(i)Na+ 02→Na2O

• The givcen equation is: Na + O2 → Na2O.The Na and O both are not balanced, so balanced equation by hit and trial method will be:
• 4Na + O2 → 2Na$a_2$O.

(ii) H2O2 → H2O + O2

• 2H2O2→2H2O+O2

Add 2 molecules of hydrogen peroxide and 2 molecules of water. This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen. According to the law of conservation the reaction should be balanced.

(iii) Mg(OH)2 + HCl → MgCl2 + H2O

• Mg(OH)2 + 2HCl → MgCl2 + 2H2O