Answer :

1. MnO2 + 4HCl MnCl2 + Cl2 + H2O

When manganese dioxide is heated with concentrated hydrochloric acid, then a greenish yellow gas is liberated which is called chlorine (Cl2) and manganese chloride and water is also formed along with chlorine. Chlorine has various applications in our industry.

2. Common name of sodium chloride (NaCl) is ‘common salt’ or ‘Table salt’. Sodium and Chlorine react together to give sodium chloride. Its chemical equation is given below:

2Na + Cl2 2NaCl

Common salt gives taste to our food. Sodium chloride is the salt most responsible for the salinity of seawater.

3. Chemical name of baking soda is sodium bicarbonate (NaHCO3).

Baking soda is made by passing carbon dioxide (CO2) through sodium carbonate solution (Na2CO3) in water (H2O).

Na2CO3 + H2O + CO2 2 NaHCO3

Baking soda is used to make a baking powder which is while cooking something or in bakery items, Baking Soda is also used in medicine as an antacid.

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Fill in the blankKarnataka Board - Science Part I

The chief sourcesKarnataka Board - Science Part I