Chemical reactions giving their balanced equaion

1. Dil. HCl is added to a test tube containing iron nail & burning candle is taken near the mouth   of the test tube.

Ans. When dil.HCl is added to a test tube containing iron nail, iron being a metal, displaces hydrogen from dil. HCl to form hydrogen gas & ferrous chloride.

Fe + 2HCl        ----->     Fe Cl₂              +      H₂

Iron                             Ferrous chloride   Hydrogen gas

2. Dilute sodium hydroxide is added to a test tube containing aluminium ribbon.

Ans. When sodium hydroxide is added to a test tube containing aluminium ribbon, aluminium being amphoteric in nature, reacts with sodium hydroxide to form hydrogen gas & sodium aluminate.

2Al + 2NaOH     ----->       2 NaAlO₂        +   H₂ 

Aluminium                    Sodium aluminate

3. Aluminium carbonate is boiled with dil. HCl.

Ans. When aluminium carbonate is boiled with dil. HCl, aluminium chloride, carbon dioxide & water are formed.

Al₂ (CO₃)₃ + 6 HCl    ----->      2AlCl₃        +             3H₂O        

Aluminium Carbonate             Aluminium chloride

4. Dil. HCl is added to sodium carbonate.

Ans. When dil. HCl is added to sodium carbonate, a solution of sodium chloride & carbon dioxide are formed.

Na₂CO₃ + HCl_(aq)      ----->           2NaCl_(aq)      +     H₂O_(l)   +    CO₂₍₉₎

Sodium carbonate                      Sodium chloride

5. Dil. HCl is added to sodium hydrogen carbonate.\

Ans. When dil. HCl is added to sodium hydrogen carbonate, a solution of sodium chloride & carbon       dioxide is formed.

NaHCO₃₍₅₎ +  HCl_(aq)       ----->     NaCl_(aq)    +   H₂O_(l)  +   CO₂₍₉₎

Sodium bicarbonate             Sodium chloride

6. Copper oxide reacts with dil. HCl.

Ans. Copper oxide dissolves in dil. HCl to give blue coloured copper chloride & water.

CuO + 2HCl       ----->        CuCl₂    +     H₂O

Copper oxide              Copper chloride.

7. Carbon dioxide is passed through calcium hydroxide.

Ans. When carbon dioxide is passed through calcium hydroxide, white ppt. of calcium carbonate &         water is formed.

Ca(OH)₂               +        CO₂              ----->     CaCO₃        +     H₂O

Calcium hydroxide       Carbon dioxide         Calcium carbonate

8. Sodium hydrogen carbonate is strongly heated.

Ans. When sodium hydrogen carbonate is strongly heated, it decomposes to give sodium carbonate,        water & carbon dioxide.

2 NaHCO₃  ----->            Na₂ CO₃               +         H₂O    +   CO₂

Sodium bicarbonate    sodium carbonate

9. Chlorine gas is passed through slaked lime.

Ans. When chlorine gas is passed through slaked lime, bleaching powder is formed.

10. Bleaching powder, reacts with atmospheric carbon dioxide gas.

Ans. When bleaching powder reacts with atmospheric carbon dioxide it forms calcium carbonate & chlorine gas.

11. Sodium carbonate is treated with dil. HCl.

Ans. When sodium carbonate is treated with dil.HCl, a solution of sodium chloride & carbone dioxide is formed.

Chemical reactions, Chemical reaction, iron nail & burning candle, Iron, Ferrous chloride, Hydrogen gas, sodium hydroxide, aluminium ribbon, Slaked lime, bleaching powder, Bleaching powder, Calcium carbonate, Chlorine, Sodium carbonate, Sodium chloride, carbon dioxide H2O