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Which separation techniques will you apply for the separation of the following? (1) Sodium chloride from its solution in water. (2) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. (3) Small pieces of metal in the engine oil of a car. (4) Different pigments from an extract of flower petals. (5) Butter from curd. (6) Oil from water. (7) Tea leaves from tea.(8) Iron pins from sand. (9) Wheat grains from husk. (10) Fine mud particles suspended in water

Answer: The substances that we see are not in their pure form. They are typically a mixture of two substances or more. Surprisingly, mixtures... View Article

Which one of the following does not describe Nitrogen? (a) Nitrogen is a chemical element with atomic number 7 (b) Nitrogen is a nonmetal with an electronegativity of 3.04 (c) Nitrogen is very high reactive due to high bond dissociation energy (d) The triple bonds in nitrogen atom makes it difficult to convert Nitrogen into other compounds

Answer: (c) Nitrogen is very high reactive due to high bond dissociation energy. This statement is wrong. Due to the presence of a triple bond... View Article

Which of the following correctly describes the magnetic field near a long straight wire? (A) The field consists of straight lines perpendicular to the wire (B) The field consists of straight lines parallel to the wire (C) The field consists of radial lines originating from the wire (D) The field consists of concentric circles centered on the wire

Answer: (D) The field consists of concentric circles centered on the wire A magnetic field is an invisible space that surrounds a magnet.... View Article