Which of the following is used as the electrolyte in a lead-acid storage battery?
A. Phosphoric acid
B. Hydrochloric acid
C. Nitric acid
D. Sulphuric acid
Answer: Option D
Solution (By JKExamLibrary)
A lead-acid battery, commonly used in automobiles, consists of lead anodes and lead dioxide cathodes. The electrolyte used is an aqueous solution of sulfuric acid (H2SO4). During discharge, the acid is consumed to form lead sulfate and water, decreasing the density of the electrolyte.
Explanation:
Ant sting contains formic acid (methanoic acid, HCOOH). It causes a burning sensation. It can be neutralized by applying a mild base like baking soda. Acetic acid is in vinegar, citric acid in lemons, lactic acid in curd.
Explanation:
Physical changes affect form or state but not chemical composition. They can be reversible (melting/freezing). No new substances form. They may be endothermic or exothermic. Example: dissolving salt in water – salt is still NaCl.
Explanation:
Atomic number 15 is phosphorus. Electronic configuration: 2, 8, 5. Number of shells = 3 (Period 3). Valence electrons = 5, so it is in group 15 (10+5) for p-block elements. Group 5 is for d-block. Thus Group 15, Period 3.
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