Chemistry
Assertion (A): A block of pure silver metal is used as anode during silver plating.
Reason (R): Silver ions are deposited as metal at the anode.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Electrolysis
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Answer
A is true but R is false.
Explanation — The block of pure silver is used as anode because it is active electrode, as it slowly dissolves in the solution, Ag⁺ ions are produced for the plating process. Hence the assertion (A) is true.
Silver ions are deposited on to the article that acts as cathode. Hence reason (R) is false.
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Related Questions
Assertion (A): Oxidation occurs at the anode.
Reason (R): Electrons are gained at the anode.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Polar covalent compounds can form ions when dissolved in water.
Reason (R): Electrovalent compounds show dissociation.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
(Choose the correct word to fill in blank)
Cations are formed by …………… (loss/gain) of electrons and anions are formed by …………… (loss/gain) of electrons.Match the following in column A with the correct answer from the choices given in column B.
Column A Column B 1. Ammonium hydroxide soln. Contains only ions. 2. Dilute hydrochloric acid Contains only molecules 3. Carbon tetrachloride Contains ions and molecules