Which fertilizer contains the highest percentage of nitrogen?
A. Sodium nitrate
B. Ammonium sulfate
C. Urea
D. DAP
Answer: Option C
Solution (By JKSSB Mock Tests)
Urea (NH₂CONH₂) contains about 46% N. Ammonium sulfate ~21% N, sodium nitrate ~16% N, DAP ~18% N (and 46% P₂O₅). Urea is the most concentrated solid nitrogen fertilizer.
Explanation:
The ignition temperature (or kindling temperature) is the minimum temperature to which a fuel must be heated so that it catches fire and starts burning spontaneously. A lower ignition temperature means the fuel is more highly flammable and can ignite more easily at ambient conditions.
Explanation:
Detergents with branched hydrocarbon chains (ABS) resist bacterial degradation and persist in water bodies causing foam and pollution. Linear alkylbenzene sulfonates (LAS) are biodegradable and preferred. Soap is biodegradable but forms scum with hard water. Sodium lauryl sulfate is used in shampoos and is biodegradable. Environmental regulations now mandate the use of linear chain detergents.
Explanation:
Polyethylene (polythene) softens on heating and hardens on cooling, so it is thermoplastic. Bakelite is thermosetting; rubber is elastomer; silk is natural polymer.
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