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NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
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Medium
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Understanding
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Assertion (A): Mendeleev's arranged elements in horizontal rows and vertical columns.
Reason (R): Mendeleev's ignored the order of atomic weight thinking that the atomic measurements might be incorrect.
Reason (R): Mendeleev's ignored the order of atomic weight thinking that the atomic measurements might be incorrect.
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Correct option: B
Both Assertion and Reason are correct; and Reason is not the correct explanation of Assertion
Option B (Both Assertion and Reason are correct; and Reason is not the correct explanation of Assertion) is correct because Mendeleev did arrange elements in rows and columns and sometimes ignored atomic weight order, but the latter doesn't explain the former.
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The elements with zero electron affinity are
S-I: paramagnetic.
S-II: All the orbitals present in ion are doubly occupied. Which of the following is the most electropositive element? The law of Octaves is not applicable to: Which of the following electronic configuration does not belong to same block as others? Identify the least stable ion among the following
S-II: All the orbitals present in ion are doubly occupied. Which of the following is the most electropositive element? The law of Octaves is not applicable to: Which of the following electronic configuration does not belong to same block as others? Identify the least stable ion among the following