Assertion and Reason Questions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry

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Assertion and Reason Questions for Some Basic Concepts of Chemistry

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Q.1. Assertion : Equal moles of different substances contain same number of constituent particles.
Reason : Equal weights of different substances contain the same number of constituent particles.

Answer Answer: (c) Equal moles of different substances contain same number of constituent particles but equal weights of different substances do not contain the same number of constituent particles.

Q.2. Assertion : 1.231 has three significant figures.
Reason : All numbers right to the decimal point are significant.

Answer Answer: (d) 1.231 has four significant figures all no. from left to right are counted, starting with the first digit that is not zero for calculating the no. of significant figure.

Q.3. Assertion : Volume of a gas is inversely proportional to the number of moles of gas.
Reason : The ratio by volume of gaseous reactants and products is in agreement with their mole ratio.

Answer Answer: (d)


Q.4. Assertion : Significant figures for 0.200 is 3 whereas for 200 it is 1.
Reason : Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.

Answer Answer: (c)

Q.5. Assertion : One atomic mass unit is defined as one twelfth of the mass of one carbon – 12 atom.
Reason : Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.

Answer Answer: (b)

Q.6. Assertion : The empirical mass of ethene is half of its molecular mass.
Reason : The empirical formula represents the simplest whole number ratio of various atoms present in a compound.

Answer Answer: (a)

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