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The atoms of which of the following pair...

The atoms of which of the following pair of elements are most likely to exist in free state ?

A

hydrogen and helium

B

argon and carbon

C

neon and nitrogen

D

Helium and neon

Text Solution

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The correct Answer is:
B
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. One nm is equal to :

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  2. The scientist who proposed the first letter (or first letter and anoth...

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  3. The atoms of which of the following pair of elements are most likely ...

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  4. Which of the following elements has the same molecular mass as its ato...

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  5. In water, the proportion of oxygen and hydrogen by mass is :

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  6. In hydrogen peroxide (H(2)O(2)), the proportion of hydrogen and oxyg...

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  7. The symbols of the elements cobalt, aluminium, helium and sodium respe...

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  8. Copper sulphate reacts with sodium hydroxide to form a blue preci...

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  9. Potassium chlorate decomposes, on heating, to form potassium chlori...

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  10. In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of...

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  11. Magnesium and oxygen combine in the ratio of 3 : 2 by mass to for...

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  12. When 5g of calcium is burnt in 2g of oxygen, then 7 g of calcium o...

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  13. An liquid compound X of molecular mass 18 u can be obtained from a n...

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  14. One of the forms of a naturally occurring solid compound P is usually...

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  15. What do we call those particles which have more or less electrons t...

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  16. What do we call those particles which have : (a) more electrons ...

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  17. Define 'formula mass' of a compound.

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  18. What do we call those particles which are formed : (a) by the gain o...

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  19. State whether the following statements are true or false : (a) A ...

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  20. Write dow the formulae for the following compounds : (a) Calcium o...

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