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The three imaginary elements X,Y and Z r...

The three imaginary elements `X,Y` and `Z` represent a Döbereiner's triads. If the atomic mass of element `X` is `14` and that of element `Y` is `46`, then the atomic mass of element `Z` will be :

A

`28`

B

`60`

C

`78`

D

`72`

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The correct Answer is:
C
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Three elements B, Si and Ge are :

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  2. In Mendeleev's periodic table, gaps were left for the elements to be d...

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  3. The three imaginary elements X,Y and Z represent a Döbereiner's triads...

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  4. The atomic numbers of four elements P,Q,R and S are 6,8,14 and 16 resp...

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  5. Which of the following statement is correct in regard to the classific...

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  6. Which of the following statements about the modern periodic table is c...

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  7. An element X forms an oxide X(2)O(3). In which group of Mendeleev's pe...

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  8. The modern periodic table was prepared by

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  9. The atomic particle whose number in the atoms of an element always rem...

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  10. The atomic masses of three elements X,Y and Z having similar chemical ...

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  11. In the following set of elements one element does not belong to the se...

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  12. In the following set of elements, one element does not belong to the s...

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  13. Can the following groups of elements be classified as Dobereiner's tri...

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  14. Consider the following elements: Na, Ca, Al, K,Mg, Li (a) Which of...

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  15. Which element has (a) two shells, both of which are completely filled...

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  16. Consider the followng elements: Ca, Cl, Na, I, Li, Ba Sr, K, Br Se...

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  17. Mendeleve predicted the exitence of certain elements not known at that...

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  18. A part of the early classification of elements has been given below: ...

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  19. (a) Explain why: (i) All the elements of a group have similar chemic...

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  20. (a) How does the electropositive character of elements change on going...

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