Which of the following is used as an inert electrode in electrolysis?
A. Copper
B. Platinum
C. Silver
D. Zinc
Answer: Option B
Solution (By JKSSB Mock Tests)
Inert electrodes do not participate in the chemical reaction; they merely provide a surface for electron transfer. Platinum and graphite are common inert electrodes. Copper, zinc, and silver are active electrodes and can dissolve or deposit during electrolysis, thereby participating in the chemical change.
Explanation:
Soap (sodium carboxylate) reacts with Ca²⁺/Mg²⁺ to form insoluble calcium or magnesium carboxylate (scum). This precipitates and reduces cleaning efficiency. Sodium and potassium salts are soluble. This is why detergents, which form soluble Ca/Mg salts, are used. Scum is visible in hard water areas.
Explanation:
Green chemistry aims to design products and processes that minimize the use and generation of hazardous substances. Using hydrogen peroxide (H2O2) for bleaching paper is an example of green chemistry because it breaks down into harmless water and oxygen, unlike chlorine which can produce toxic, persistent organochlorine byproducts.
Explanation:
Ammonia reacts with CO₂ to produce urea: 2NH₃ + CO₂ → NH₂COONH₄ → (NH₂)₂CO + H₂O. It is also used to make ammonium sulfate, ammonium nitrate, DAP, etc. Superphosphate is made by treating rock phosphate with sulfuric acid; no ammonia. Gypsum is CaSO₄·2H₂O. Potassium sulfate is K₂SO₄. Ammonia is a key intermediate in nitrogenous fertilizers.
No comments yet. Be the first to start the discussion!