During electroplating of an iron spoon with silver, the anode is:
A. Platinum
B. Graphite
C. Iron spoon
D. Silver rod
Answer: Option D
Solution (By JKSSB Mock Tests)
The silver rod dissolves (Ag → Ag⁺ + e⁻) at the anode, replenishing Ag⁺ in the electrolyte, which deposits on the iron spoon (cathode). Iron spoon remains intact.
Explanation:
Hydrochloric acid (HCl) is a strong acid because it completely dissociates into H⁺ and Cl⁻ ions in aqueous solution. Acetic, citric, and carbonic acids are weak acids as they only partially dissociate in water, establishing an equilibrium between the unionized molecules and their ions.
Explanation:
Ammonium ion (NH₄⁺) is formed when NH₃ donates its lone pair to H⁺, forming a coordinate (dative) bond. CH₄ and H₂O have ordinary covalent bonds; NaCl is ionic. In NH₄⁺, all four N–H bonds become equivalent.
Explanation:
Polythene (polyethylene) softens on heating and can be remolded, thus thermoplastic. Bakelite and melamine are thermosetting (cannot be remolded). Vulcanized rubber is also thermoset due to cross-linking. Thermoplastics have linear or branched chains, no cross-links.
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