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Fr has half life period of...

Fr has half life period of

A

21 seconds

B

21 minutes

C

21 hours

D

21 kgs

Text Solution

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The correct Answer is:
B
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MARVEL PUBLICATION-S BLOCK ELEMENTS -TEST YOUR GRASP
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  3. The elements of group 1 are called alkali metals because

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  4. Chill salt petre is

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  5. Which of the following is sparingly soluble in water ?

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  6. Which of the following statement is incorrect ? a)Oxide of aluminium ...

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  7. Pick out statement (s) which is/are not true about diagonal relationsh...

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  8. Which one is the highest melting halide ?

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  9. "Electron" is an alloy of

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  10. Sodium burns in dry air to give

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  11. Select odd pair of name of chemical and its chemical composition.

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  12. The raw materials required for the manufacture of Na(2)CO(3) by Solva...

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  13. The carbonate that will not decompose on heating is

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  14. The alkali metal used in photoelectric cell is

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  15. Which of the following if good source of potassium ?

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  16. The first ionization enthalpy of magnesium is lower than the first ion...

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  17. Which of the following feact only with boiling water ?

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  18. Mg burns in air to give

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  19. Beryllium and aluminium exhibit many properties which are similar . Bu...

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  20. Which of the following is not a compound of calcium ?

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  21. Mark the compound which does not contain calcium carbonate ?

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