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Assertion: According to Mendeleeff, peri...

Assertion: According to Mendeleeff, periodic properties of elements is a function of their atomic masses.
Reason : Atomic number is equal to number of protons

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-PERIODIC TABLE-OBJECTIVE EXERCISE -2A (MENDELEEFF.S PERIODIC TABLE)
  1. The period that contains only gaseous elements is

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  2. The element which belong to 3rd period and IVA group of periodic table...

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  3. Assertion: According to Mendeleeff, periodic properties of elements is...

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  4. Pair of elements with the following atomic numbers have the same chemi...

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  5. The sub-shells filled one by one for 4th period elements are

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  6. The starting element and last element in the largest period in modern ...

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  7. Which of the following has both members from the same period of the pe...

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  8. Atomic number of nitrogen is 7. The atomic number of the third member ...

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  9. Element with atomic number 38, belongs to

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  10. Set of elements with the following atomic numbers belong to the same g...

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  11. Which of the following pairs has both members from the same group of t...

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  12. The elements with atomic number 10, 18, 36, 54 and 86 are all

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  13. Which of the following pairs has elements containing same number of el...

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  14. The period that includes all blocks of elements is

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  15. Among s-block metals and transition metals, which are more metallic?

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  16. Element with atomic number 52 belongs to

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  17. The general electronic configuration of f-block elements is

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  18. The common oxidation state exhibited by inner transition elements usua...

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  19. The pair of atomic numbers which represent the p-block elements

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  20. Which of the following is an element present in the d-block, but not a...

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