Chemistry
Grade-10
Easy
Question
The incorrect statement among the following is
- On exposure to air, sodium hydroxide becomes liquid and after some time it changes to white powder.
- During electrolysis of brine, Cl2 gas is given off at the anode and H2 gas at the cathode.
- Bleaching powder is used for disinfecting drinking water.
- Bleaching powder undergo self-decomposition to give calcium carbonate and calcium chloride.
Hint:
Bleaching powder decomposition is a second order process.
The correct answer is: Bleaching powder undergo self-decomposition to give calcium carbonate and calcium chloride.
- On exposure to air sodium hydroxide becomes liquid, it reacts with moisture.
- During electrolysis of brine solution, Chlorine is produced at anode and Hydrogen in cathode.
- Bleaching powder is used for disinfecting drinking water.
- Bleaching powder decomposition is a second order process with respect to hypochlorite ion concentration. It doesn't decompose to calcium carbonate and calcium chloride.
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(I). 
(II). 
(III). 
(IV). 
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(I).
(II).
(III).
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State whether the following statements are true or false.
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II. Sodium hydroxide on being exposed to air reacts with the CO2 present in the air to form sodium carbonate.
III. Sodium hydroxide can be used in the purification of bauxite (an aluminium ore) during the extraction process.
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State whether the following statements are true or false.
I. Bleaching powder is extensively used in the petroleum refining.
II. Sodium hydroxide on being exposed to air reacts with the CO2 present in the air to form sodium carbonate.
III. Sodium hydroxide can be used in the purification of bauxite (an aluminium ore) during the extraction process.
IV. Bleaching powder is acts as both oxidising as well as reducing agent due to presence of oxygen.
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Identify the X, Y, P, Q and R in the below figure.
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Identify the X, Y, P, Q and R in the below figure.
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