Compost is decomposed organic matter (plant waste, manure) and is an organic fertilizer. Urea, though organic compound, is considered a synthetic nitrogenous fertilizer when industrially produced. Organic fertilizers are derived from natural sources: manure, bone meal, compost. They improve soil structure. Ammonium nitrate, superphosphate are inorganic/synthetic. Urea is often categorized as synthetic organic.
Assertion (A): Covalent compounds generally have low melting points. Reason (R): The intermolecular forces in covalent compounds are weak compared to ionic compounds.
A.A is false but R is true.
B.Both A and R are true and R is the correct explanation of A.
C.Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Covalent compounds consist of molecules held together by weak van der Waals forces, unlike the strong electrostatic forces in ionic lattices. Therefore, less heat energy is required to break these intermolecular forces, resulting in low melting and boiling points. Both statements are true and R correctly explains A.
Explanation:
Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. Benzene (C6H6) has a ring structure with alternating double bonds (delocalized pi electrons), making it highly unsaturated. Cyclohexane, propane, and methane contain only single bonds and are saturated hydrocarbons.
Explanation:
Mendeleev left gaps and predicted properties of eka-boron (scandium), eka-aluminium (gallium), and eka-silicon (germanium). Germanium was discovered in 1886, its properties matched predictions, confirming the periodic law.
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