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Question
Arrange the following according to the instruction given in bracket:
Cu2+, Na+, Zn2+, Ag+ (The order of Preferential discharge at the cathode)
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Solution
Ag+ > Cu2+ > Zn2+ > Na
Explanation:
Increasing the ease of discharge
K, Na, Ca, Mg, Al, Zn, Fe, H, Cu, Ag
During electrolysis, the lower-position elements discharge more easily. The cation can easily accept electrons from the elements.
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\[\ce{SO^2-_4, NO^-_3 {and} OH-}\]
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Name two substances in the following case:
Contain only ions.
Explain the following:
On electrolysis of dilute copper (II) sulphate solution, copper is deposited at the cathode but no hydrogen gas evolves there. Explain why?
Explain the following:
When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?
