10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Important Chemical Compounds
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A colourless and odourless gas is liberated when hydrochloric acid is added to a solution of washing soda. The name of the gas is:
Detailed Solution for Test: Important Chemical Compounds - Question 2
Washing soda is chemically sodium carbonate, which is a basic salt. When dilute HCl is added to washing soda, acid base neutralisation reaction takes place and sodium chloride is formed along with water and carbon dioxide. Following is the chemical equation for the reaction
Detailed Solution for Test: Important Chemical Compounds - Question 5
Sodium acetate (CH3COONa) is a salt in solid state and can't be regarded as an acid or base in anhydrous or molten form.
Although, being an ionic compound, sodium acetate dissociates in water to produce sodium ion Na+ and acetate ion CH3COO-. These ions react with water producing NaOH and CH3COOH.
Now, as NaOH is a strong base and CH3COOH is a weak acid, the resultant solution is basic in nature. Hence, sodium acetate is basic in aqueous medium.
The compounds obtained on heating baking soda are:
Detailed Solution for Test: Important Chemical Compounds - Question 8
Sodium hydrogen carbonate (also known as sodium bicarbonate or bicarbonate of soda) has the chemical formula NaHCO3 . When it is heated above about 80°C it begins to break down, forming sodium carbonate, water and carbon dioxide.
Plaster of Paris is prepared by heating which of the following compounds?
Detailed Solution for Test: Important Chemical Compounds - Question 9
Gypsum is calcium sulphate dihydrate. The chemical formula of gypsum is CaSO4·2H2O
Plaster of paris is prepared by heating gypsum to a temperature of 373K.When gypsum is heated to a temperature of 373k ,It loses three-Fourths of its water of crystallisation and forms plaster of paris.
Detailed Solution for Test: Important Chemical Compounds - Question 10
The excess of acid in the stomach causes acidity. As NaHCO3 is alkaline in nature, it neutralizes the excess acid and relieves discomfort. Hence it is an essential ingredient in antacids. Following equation explains its reaction with HCl
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