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An element X forms the following ...

An element X forms the following compounds with hydrogen, carbon and oxygen ?
`H_(2)X, CX_(2), XO_(2), XO_(3)`

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The correct Answer is:
`2, 4` and `6`
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. The formula of the sulphate of an element X is X(2)(SO(4))(3). The for...

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  2. An element A forms an oxide A(2)O(5). (a) What is the valency of ...

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  3. An element X forms the following compounds with hydrogen, ca...

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  4. If the aluminium salt of an anion X is Al(2)X(3), what is the valency...

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  5. The formula of carbonate of a metal M is M(2)CO(3). (a) What will ...

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  6. The atom of an element X contains 17 protons, 17 electrons and 18 neu...

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  7. What is a group of 6.022 xx 10^(23) particles known as ?

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  8. What name is given to the amount of substance containing 6.022 xx 10...

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  9. What is the numerical value of Avogardo number ?

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  10. How many atoms are present in one gram atomic mass of a substance ?

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  11. How many molecules are present in one gram molecular mass of a substan...

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  12. What name is given to the number 6.022 xx 10^(23) ?

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  13. Convert 12 g of oxygen gas into moles.

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  14. How many moles are 3.6 g of water ?

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  15. What name is the mass of 0.2 mole of oxygen atoms ?

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  16. Find the mass of 2 moles of oxygen atoms ?

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  17. Fill in the following blanks : (a) 1 mole contains "…………." atoms, ...

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  18. (a) How many atoms are there in exactly 12g of carbon-12 element ? (...

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  19. Calculate the mass of 12.044 xx 10^(25) molecules of oxygen (O(2)).

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  20. What is the number of molecules in 1.5 moles of ammonia ?

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