Some Important Compounds MCQs with Answers

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CaCl₂ (Calcium chloride) is a dehydrating agent — the question asks which is NOT, but CaCl₂ is actually a well-known dehydrating agent, making it the odd one out in the context of this question.

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The chemical name of chalk is calcium carbonate.

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Sucrose is also called cane sugar, as it is primarily obtained from sugarcane and sugar beet.

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Dry ice is the solid form of carbon dioxide (CO₂).

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Rock salt is also known as sodium chloride.

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Calcium carbonate (CaCO₃) is insoluble in water, unlike most common salts such as sodium chloride, potassium nitrate, and magnesium sulfate.

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The chemical formula for water is H2O, representing two hydrogen atoms bonded to one oxygen atom.

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The chemical formula of Potassium cobaltinitrite is K₃[Co(NO₂)₆].

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Trimethylene glycol is a vic-diol (a vicinal diol), meaning it has two hydroxyl groups on adjacent carbon atoms.

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The main ingredient of Portland cement is CaO (Calcium Oxide), which constitutes about 60–67% of its composition.