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Chapter 19Classification of Elements and Periodicity in Properties

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01Chemistry

Classification of Elements and Periodicity in Properties Q01: Which statement about concept 1 is correct?

AModern periodic law is based on atomic number.

BIt is defined as complete loss of all protons from an atom.

CIt requires conversion of every substance into a noble gas.

DIt is independent of composition, structure, concentration and temperature in every case.

02Chemistry

Classification of Elements and Periodicity in Properties Q02: A student is revising concept 1. Which correction is chemically sound?

AIt occurs only by peptide bond formation in proteins.

BIt is explained solely by colour change without particles or bonds.

CIt always has zero relation to electrons, ions or molecular structure.

DModern periodic law is based on atomic number.

03Chemistry

Classification of Elements and Periodicity in Properties Q03: In a standard exam item involving concept 1, which inference is valid?

AIt means all reactions become spontaneous without conditions.

BIt is a nuclear fission rule rather than a chemistry principle.

CModern periodic law is based on atomic number.

DIt is valid only at absolute zero for pure noble gases.

04Chemistry

Classification of Elements and Periodicity in Properties Q04: Which conclusion about concept 1 is valid and unambiguous?

AIt requires every molecule to be linear and nonpolar.

BModern periodic law is based on atomic number.

CIt always produces sodium chloride as the only product.

DIt is measured by atomic mass number alone in every problem.

05Chemistry

Classification of Elements and Periodicity in Properties Q05: Which statement about concept 1 remains true under usual IIT/NEET assumptions?

AModern periodic law is based on atomic number.

BIt is defined as complete loss of all protons from an atom.

CIt requires conversion of every substance into a noble gas.

DIt is independent of composition, structure, concentration and temperature in every case.

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