Dmitri Mendeleev's periodic table was based on: MCQ with Answer and Explanation

Explanation:
In electroplating, the object to be electroplated is connected as the cathode, where metal cations in the electrolyte are reduced to metal atoms and deposited as a coating. The anode is usually the plating metal, which oxidizes and dissolves, replenishing the electrolyte. For example, silver plating: cathode is the article, anode is pure silver, electrolyte is AgCN/AgNO₃.

Explanation:
Sodium carbonate (soda ash) is dissolved in water and crystallized to obtain washing soda. Heating baking soda gives anhydrous sodium carbonate. Brine electrolysis gives NaOH, Cl₂, H₂. Solvay process makes Na₂CO₃.

Explanation:
NaCl is the product of neutralization of HCl (strong acid) and NaOH (strong base). Neither ion hydrolyses appreciably, so the solution remains neutral (pH=7). Salts of strong acid + weak base are acidic (NH₄Cl), weak acid + strong base are basic (CH₃COONa).