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Assertion (A) : Mendeleeff placed "Be, M...

Assertion (A) : Mendeleeff placed "`Be`, `Mg` and `Ca`" in one group.
Reason (R) : When " ` Be`, `Mg` and `Ca`" react with oxygen and form BeO, MgO and CaO.

A

`1`. A' and 'R' are true and 'R' is supported to 'A'

B

`2`. A' and 'R' are true and 'R' is not supported to 'A'

C

`3`. A' is true but 'R' is false

D

`4`. A' is false but 'R' is true

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. State and give one example for Dobereiner's law of triads and Newland'...

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  2. "Select the common point/s' in Dobereiner and Newlands Laws. i) Atomic...

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  3. Assertion (A) : Mendeleeff placed "Be, Mg and Ca" in one group. Reaso...

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  4. Which one is not a salient features of the Mendeleeff's periodic table...

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  5. A: The properties of elements are the periodic functions of their atom...

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  6. Assertion (A) : It is a better way of arranging the elements in the pe...

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  7. Z indicates in the notation ^A.Xz. i) Number of protons in the atom ii...

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  8. Assertion (A): Na' is a s-block element Reason (R) : 'Na' gets its las...

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  9. Assertion (A) : 'Cl' is a non-metal. Reason (R): Non-metal has five or...

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  10. (a) Lanthanoids and actinoids are belongs to 3rd group. b) Lanthanoids...

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  11. Assertion (A) : Lanthanides and Actinides are called as Inner  Transit...

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  12. Why do elements in the same group have similar physical and chemical p...

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  13. The pair of elements that have similar chemical properties are

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  14. Pavan (P) : The general electronic configuration of alkali metal famil...

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  15. Assertion (A): ‘H' & 'He' belongs to period - 1. Reason (R) : 'H & 'He...

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  16. Assertion (A): The first period in periodic table contain only two ele...

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  17. Suneetha (A) : Third period contain 18 elements, because it has 3 subs...

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  18. James (A) : The positive ions of an element has less in size than its ...

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  19. Balu (B) : Valence of an element with  respect to hydrogen is the numb...

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  20. Valeney of Ca is

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