Chemistry (General Concepts) MCQs with Answers

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The number of moles of CO2 containing 8.0 g of oxygen is 0.25 moles.

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Avogadro's number is approximately equal to 6.022 × 10²³, representing the number of particles in one mole of a substance.

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-NO₂ (nitro group) is a meta-director in electrophilic aromatic substitution because it is a strong electron-withdrawing group.

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The C-H bond distance is the longest in C2H6 (ethane).

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Alkenes are hydrocarbons that have a carbon-carbon double bond.

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Molecular crystals are generally soft because their molecules are held together by weak van der Waals forces or hydrogen bonds rather than strong ionic or covalent bonds.

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A sigma bond is formed by linear overlapping (also called head-on or axial overlapping) of atomic orbitals along the internuclear axis.

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Alkyne possesses linear geometry because its carbon atoms are sp-hybridized with a bond angle of 180°.

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In ethylene (C₂H₄), there are 2 unhybridized p-orbitals, one on each carbon atom, which overlap sideways to form the pi (π) bond.

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The shape of iodine trichloride (ICl₃) is T-shaped due to the presence of three bond pairs and two lone pairs around the central iodine atom.