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Which of the following elements were unk...

Which of the following elements were unknown at that time of Mendeleev?

A

Na, Mg

B

Fe, CO

C

K, Cu

D

Ga, Ge

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The correct Answer is:
D
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FULL MARKS-PERIODIC CLASSIFICATION OF ELEMENTS -Additional Questions(M.C.Q)
  1. The law of triads is not obeyed by

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  2. The law of triads is obeyed by

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  3. Which of the following elements were unknown at that time of Mendeleev...

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  4. Which one of the following is the first in first transition series?

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  5. Which period mostly include man made radioactive elements?

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  6. Which one of the following is called halogen family?

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  7. What will be the change in valency down the group in the periodic tabl...

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  8. Which one of the following is a metalloid?

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  9. Which one of the following is a metal?

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  10. The general electronic configuration of d- block element is

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  11. Which of the following is the correct electronic configuration of nobl...

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  12. Which one of the following is in solid state at room temperature?

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  13. Which of the following is not a metalloid (or) semi-metal?

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  14. Which of the following metal is not in liquid state?

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  15. Which of the following is not a periodic property?

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  16. Which of the following property increases as we go down the group in t...

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  17. Which one of the following is not an isoelectronic ion?

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  18. Which one of the following is not an isoelectronic ion?

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  19. Which of the following possess almost same properties due to lanthanid...

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  20. Statement-1: Ionization enthalpy of Be is greater than that of B. ...

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