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Atomic weights of practically all the el...

Atomic weights of practically all the elements are very nearly whole numbers and not always whole numbers. This is because :

A

of existence of allotropic forms

B

Valency of elements have frictional values

C

Equivalent weights are not whole numbers

D

Of the existence of isotopes for all the elements

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The correct Answer is:
D
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MBD PUBLICATION-BASIC CONCEPT OF THEORY-QUESTION BANK
  1. Different proportions of oxygen in the various oxides of nitrogen prov...

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  2. Chemical equation is balanced according to the law of:

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  3. Atomic weights of practically all the elements are very nearly whole n...

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  4. The law of multiple proportions are illustrated by which pair of compo...

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  5. Law of raciprocd proportions can be used to determine :

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  6. One of the important postulates of Dalton's atomic theory is :

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  7. According to the Dalton's atomic theory in a chemical change :

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  8. State Dalton's atomic theory.

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  9. Write some important postulates of modern atomic theory.

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  10. Describe the various postulates of Dalton's atomic theory.

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  11. What are the limitations of this theory ?

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  12. What is the value of Avogadro's number ?

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  13. How many atoms are present in a molecule of white phosphorus?

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  14. How many molecules are present in 2.24 ml of CO2 are measured at STP ?

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  15. Between one gram of water and one gram of methanol which has more numb...

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  16. Find out the number of molecules in 0.5 g of nitrus oxide ?

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  17. How many atoms are present in 49 grams of H2SO4 ?

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  18. Calculate the number of moles in 25 grams of calcium carbonate ?

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  19. How many gram atoms of oxygen are present in 11.2 litres of CO2 at NTP...

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  20. One mole of nitrogen occupies ml volume at NTP ?

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