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Periodic Table and Periodicity question

2025 · 28 Jan · Shift 2 · Q18
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Periodic Table and Periodicity question

2025 · 28 Jan · Shift 2 · Q18

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Given below are two statements : Statement I : According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number. Statement II : Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers. In the light of the above statements, choose the correct answer from the options given below :
  1. A
    Both Statement I and Statement II are false
  2. B
    Statement I is false but Statement II is true
  3. C
    Statement I is true but Statement II is false
  4. D
    Both Statement I and Statement II are true
View written solutionFree

Correct answer: A

  1. Analyze Statement I

    Statement I says: According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.

    • Newlands' Law of Octaves arranged elements in the increasing order of atomic mass, not atomic number.
    • Atomic number as a basis of arrangement was established much later.

    Therefore, Statement I is false.

  2. Analyze Statement II

    Statement II says: Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.

    • Lothar Meyer studied periodicity by plotting atomic volume and other physical properties against atomic mass, not atomic number.
    • Hence the statement is incorrect.

    Therefore, Statement II is also false.

  3. Choose the correct option

    Since both statements are false, the correct option is:

    A\boxed{\text{A}}A​

  4. Comparison with stored answer

    • Derived answer: A
    • Stored correct answer: A

    These agree.

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