Chemistry (General Concepts) MCQs with Answers

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Water is commonly known as the universal solvent due to its ability to dissolve a wide variety of substances.

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The total number of moles present in 2.8 g of ethylene (C₂H₄) is 0.1.

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LiOH (Lithium hydroxide) acts as an Arrhenius base because it dissociates in water to produce OH⁻ ions.

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The decreasing order of reactivity is Alkynes > Alkene > Alkane because alkynes have the highest electron density due to triple bonds, making them most reactive.

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The false statement is that atomic solids have high melting points — in fact, atomic solids like diamond have high melting points, but not all atomic solids do; however, the statement "atomic solids have high melting points" is considered false in this context because atomic solids are actually characterized by extremely high melting points due to strong covalent network bonding, making this a tricky question where the intended false statement is that they simply have "high" rather than "very high" melting points, or more accurately, atomic solids are not a standard classification — the term typically refers to network covalent solids which do have very high melting points.

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Fe²⁺ has the maximum number of unpaired electrons (4) among the given options.

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The 4th and 5th periods in the periodic table are known as long periods because each contains 18 elements.

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The maximum (or properties) of a chemical compound relies upon chemical bonding.

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A covalent bond is formed by electron sharing between atoms.

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Ionic crystals have high melting points due to the strong electrostatic forces of attraction between oppositely charged ions in the crystal lattice.