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प्रश्न
Give reason for the following:
Potassium is not extracted by electrolysis of its aqueous salt solution.
उत्तर
Electrolysis removes reactive metals from aqueous salt solutions. This is because the aqueous solution will contain both H+ and metal ions. When an electric current flows, the H+ ion is discharged first, followed by the metal. Thus, the cathode produces hydrogen gas rather than metal, and potassium does not accumulate at the cathode.
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संबंधित प्रश्न
State the electrode reaction at the anode during electrolysis of:
magnesium chloride (molten).
Write down the word or phrase from the bracket that will correctly fill in the blank in the following sentence:
We can expect that pure water ________________ (will / will not) normally conduct electricity.
Complete the sentence by choosing correct word given in bracket.
Electrolysis is the passage of ___________________
(electricity / electrons)
Write down the changes that will be seen in each instance and explain the reason behind them.
Dilute H2SO4 was taken in an electrolytic cell and an electric current was passed through it.
Choose the correct answer from the option given below:
In electrolysis of molten lead bromine anode is made up of
Choosing only words from the following list, write down the appropriate words to fill in the blanks (a) to (e) below:
anions, anode, cathode, cations, electrode, electrolyte, nickel, voltameter.
To electroplate an article with nickel requires an (a) ________ which must be a solution containing (b) ________ions. The article to be plated is placed as the (c) _________of the cell in which the plating is carried out. The (d)________ of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (e)________.
Name the gas released at the cathode when acidulated water is electrolyzed.
108 g of silver (molar mass 108 g mol-1) is deposited at cathode from AgNO3 (aq) solution by a certain quantity of electricity. The volume (in L) of oxygen gas produced at 273 K and 1 bar pressure from water by the same quantity of electricity is ______.
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are:
X - \[\ce{HCl <=> H^{1+} + Cl-}\] (in solution state)
Y - \[\ce{PbBr2 <=> Pb^{2+} + 2Br^{1-}}\] (in molten state)
From the above reaction X or Y, identify the reaction which exhibit:
electrolytic dissociation
