Which of the following is used as the electrolyte in a lead-acid storage battery?
A. Hydrochloric acid
B. Phosphoric acid
C. Nitric acid
D. Sulphuric acid
Answer: Option D
Solution (By JKSSB Mock Tests)
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:
Phenolphthalein: pH range 8.3–10; colorless below 8.3, pink above. Litmus is red in acid, blue in base. Methyl orange red in acid, yellow in base. Turmeric yellow in acid, reddish-brown in base.
Explanation:
Urea, CO(NH₂)₂, is a straight nitrogenous fertilizer with about 46% N. It contains no phosphorus or potassium. It is converted to ammonium carbonate in soil by urease enzyme, then to nitrates.
Explanation:
Portland cement is primarily composed of tricalcium silicate (3CaO·SiO₂), dicalcium silicate (2CaO·SiO₂), tricalcium aluminate (3CaO·Al₂O₃), and tetracalcium aluminoferrite. These compounds are formed by heating limestone and clay at high temperatures and then grinding with gypsum.
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