Question

1. Write balanced chemical equations for each of the following reactions :
(1) Zinc metal reacts with aqueous hydrochloric acid to produce a solution of zinc chloride and hydrogen
gas.
(it) When solid mercury (II) oxide is heated, liquid mercury and oxygen gas are produced.
(i) Sodium metal reacts with water to form sodium hydroxide along with evolution of hydrogen gas.
(iv) Liquid hydrogen peroxide decomposes to form water and oxygen gas.
(1) Acetylene/Ethyne (CH2) gas burns in oxygen to form carbon dioxide and water along with evolution
of heat.
(vi) Carbon dioxide gas is passed through lime water to form a precipitate of calcium carbonate.

Answer 1

Answer:

1) Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)

2) 2 HgO(s) ==> 2 Hg(l) + O2(g)

3)  2 Na(s) + 2H2O(l) ==> 2NaOH(aq) + H2(g)

4) 2 H2O2(l) ==> 2H2O(l) + O2(g)

5) 2 C2H2(g)+ 5O2(g) ==> 4CO2(g)+ 2H2O(g)

6) CO2(g)+ Ca(OH)2(aq) ==> CaCO3(s) +H2O(l)

Answer 2

Answer:

1) Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g)

2) 2 HgO(s) ==> 2 Hg(l) + O2(g)

3)  2 Na(s) + 2H2O(l) ==> 2NaOH(aq) + H2(g)

4) 2 H2O2(l) ==> 2H2O(l) + O2(g)

5) 2 C2H2(g)+ 5O2(g) ==> 4CO2(g)+ 2H2O(g)

6) CO2(g)+ Ca(OH)2(aq) ==> CaCO3(s) +H2O(l)

Explanation:

To obtain this we have learned all symbols and valencies.

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