Some Basic Concepts in Chemistry — Advanced + PYQ-Style MCQs

Practice 100 questions on Some Basic Concepts in Chemistry — Advanced + PYQ-Style MCQs. Includes: The mass percentage of water in a hydrated salt…; Assertion (A): Molality of a solution does not change…; Assertion (A): 1 mole of N₂ and 1 mole of O₂ occupy…. Free quiz on NoteTube.

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1.
Assertion (A): The Law of Multiple Proportions can be explained using Dalton's atomic theory. Reason (R): According to Dalton, atoms combine in whole-number ratios to form compounds.
2.
Assertion (A): Adding water to 1 L of 2 M HCl to make 2 L increases the molality significantly. Reason (R): Dilution decreases both molarity and molality.
3.
Assertion (A): In a reaction, the theoretical yield is always greater than the actual yield. Reason (R): Side reactions, incomplete reactions, and product loss during recovery reduce the actual yield.
4.
Assertion (A): Mole fraction and mass percentage are both dimensionless quantities. Reason (R): They are both ratios of the same type of quantity and hence have no units.
5.
Assertion (A): Molality of a solution does not change with temperature. Reason (R): Molality depends on the mass of solvent, which is temperature-independent.

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