Write the chemical equations of the following -:
1. Sodium carbonate reacts with dilute hydrochloric acid to give sodium chloride , water and carbon dioxide gas
2. Natural gas burns in air to form carbon dioxide and water
3. On passing electric current through molten alluminium oxide , it gives aluminium metal and oxygen gas
10. Iron and sulphur on heating to form iron(ll) sulphide.

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Solution

Dear Student,

1. $N a_{2} C O_{3} + 2 H C l \to 2 N a C l + H_{2} O + C O_{2}$
2. $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
3. $A l_{2} O_{3} \overset{e l e c t r i c c u r r e n t}{\to} 2 A l^{3 +} + 3 O^{2 -} a t c a t h o d e 2 A l^{3 +} + 6 e^{-} \to 2 A l a t a n o d e 3 O^{2 -} \to 3 O_{2} + 6 e^{-}$
10. $F e + S \overset{∆}{\to} F e S$

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