Q2 of 13 Page 158

Fill in the blanks:

1. MnO2 + 4HCl → MnCl2 + _______ + ________ .


2. Common name of sodium chloride is ________ .


3. Chemical name of baking soda is ___________ .

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.


More from this chapter

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1

Chlorine is prepared in the laboratory by the action of,

 1

The chief sources of oils used to make soap are,

 3

Answer the following:

Pure and dry chlorine gas is collected by the upward displacement of air. Give reason.

 3

Answer the following:

Name the compound of chlorine


1. Which is an anesthetic?


2. Which is used as a refrigerant?


3. Which is a disinfectant?


4. Which is used to make pipes and tube?


5. which liberates chlorine on exposure to air.