MCQ Collection
GAT Subject Chemistry MCQs
Practice GAT Subject Chemistry questions with answers and explanations.
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Correct Answer: A. Rusting of iron
Explanation:
Rusting forms new iron oxide substances.
Chemical changes involve rearrangement of atoms and new products.
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Correct Answer: B. Mass per unit volume
Explanation:
Density describes how much mass is packed into a volume.
It is commonly expressed in g/cm³ or kg/m³.
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Correct Answer: C. mole
Explanation:
The mole is the SI base unit for amount of substance.
One mole contains Avogadro's number of specified entities.
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Correct Answer: D. 6.022 × 10^23
Explanation:
Avogadro's constant gives the number of entities in one mole.
The entities may be atoms, molecules, ions, or formula units.
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Correct Answer: A. Mass of one mole of a substance
Explanation:
Molar mass is numerically related to relative atomic or molecular mass.
Its common unit is g/mol.
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Correct Answer: A. The study of matter, its properties, composition, and changes
Explanation:
Chemistry examines what matter is made of and how it behaves.
It also studies energy changes accompanying chemical processes.
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Correct Answer: B. Anything that has mass and occupies space
Explanation:
Matter includes solids, liquids, gases, and plasma.
It is composed of atoms, molecules, or ions.
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Correct Answer: C. A pure substance made of one type of atom
Explanation:
An element cannot be broken down chemically into simpler substances.
Each element is identified by its atomic number.
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Correct Answer: D. A pure substance containing elements chemically combined in fixed proportions
Explanation:
Compounds have definite formulas and characteristic properties.
Their components can be separated only by chemical means.
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Correct Answer: A. A physical combination of substances with variable composition
Explanation:
Mixture components retain much of their individual identity.
They can often be separated by physical methods.