The equivalent weight of KMnO4 in an acidic medium is:
A. M/5
B. M/1
C. M/3
D. M/7
Answer: Option A
Solution (By JKSSB Mock Tests)
In an acidic medium, potassium permanganate (KMnO4) is reduced to Mn2+. The oxidation state of Mn changes from +7 to +2, a change of 5. The equivalent weight of an oxidizing agent is its molar mass (M) divided by the number of electrons gained per molecule. Thus, Equivalent weight = M/5.
Explanation:
Vinegar is a 4-8% solution of acetic acid (CH₃COOH) in water. Formic acid is in ant sting, citric in citrus fruits, lactic in curd. Acetic acid is used as preservative and condiment.
Explanation:
Vulcanization is the process of heating natural rubber with sulphur (usually at 100-140°C) to improve its properties. Sulphur forms cross-links (disulfide bridges) between the polymer chains, making the rubber harder, more elastic, and less sensitive to temperature changes.
Explanation:
Froth flotation separates sulfide ores from gangue based on their wetting properties. Sometimes, an ore contains multiple sulfides. A depressant (like NaCN) is added to selectively prevent one mineral (e.g., FeS2) from attaching to the froth, allowing only the desired mineral (e.g., PbS) to be separated.
No comments yet. Be the first to start the discussion!