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Practice each question, then open the answer or worked solution.
In the synthesis of sodium carbonate, the recovery of ammonia is done by
treating NH4Cl with Ca(OH)2. The by-product obtained in this process is
Option (i) is the answer.
When sodium is dissolved in liquid ammonia, a solution of deep blue colour
is obtained. The colour of the solution is due to
Option (i) is the answer.
By adding gypsum to cement
Option (ii) is the answer.
Dead burnt plaster is
Option (i) is the answer.
Suspension of slaked lime in water is known as
Option (iii) is the answer.
Solution coming soon.
Which of the following elements does not form hydride by direct heating with
dihydrogen?
Option (i) is the answer.
The formula of soda ash is
Option (iv) is the answer.
A substance which gives brick red flame and breaks down on heating to give
oxygen and a brown gas is
Option (ii) is the answer.
Which of the following statements is true about Ca(OH)2?
Option (i) is the answer.
A chemical A is used for the preparation of washing soda to recover ammonia.
When CO2 is bubbled through an aqueous solution of A, the solution turns
milky. It is used in whitewashing due to disinfectant nature. What is the
the chemical formula of A?
Option (iii) is the answer.