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प्रश्न
While electrolysing water before passing the current some drops of an acid are added. Why? Name the gases liberated at cathode and anode. Write the relationship between the volume of gas collected at anode and the volume of gas collected at cathode.
उत्तर
Acid is used to increase the conductivity of water. The gas released at the cathode is hydrogen H2, and the gas released at the anode is oxygen O2. The volume of hydrogen and oxygen gases collected at respective electrodes is always in the ratio of 2: 1, where hydrogen being twice as large as oxygen.
संबंधित प्रश्न
A student Prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below :
(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside
(IV) The blue litmus paper turns red when dipped into the solution
The correct observations are :-
(A) I, II and IV
(B) I, II and III
(C) only III and IV
(D) only I and II
Write the chemical name and formula of caustic soda.
The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.
During the electrolysis of a saturated solution of sodium chloride, where is:
chlorine formed?
During the electrolysis of a saturated solution of sodium chloride, where is:
hydrogen formed?
Sodium hydroxide is used ____________.
Sodium hydroxide turns phenolphthalein solution.
The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
What is the saturated solution of Sodium Chloride called?
Sodium hydroxide is termed an alkali while Ferric hydroxide is not because ______.
Chlorine gas was prepared using electrolysis of brine solution. Write the chemical equation to represent the change. Identify the other products formed in the process and give one application of each.
