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Calculate the formula masses of follo...

Calculate the formula masses of following compounds :
(i) Sodium oxide, `Na_(2)O`
(ii) Aluminium oxide, `Al_(2)O_(3)`
(Given : Atomic masses : `Na = 23 u , O = 16 u , Al = 27 u`)

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The correct Answer is:
(i) `62 u` , (ii) `102 u`
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. An element X has a valency of 2. Write the simplest formula for : ...

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  2. Work out the formulae for the following compounds : (a) Sodium oxide...

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  3. Calculate the formula masses of following compounds : (i) Sodi...

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  4. Name the following compounds. Also write the symbols/formulae of the ...

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  5. Write the cations and anions present (if any) in the following compoun...

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  6. Give the formulae of the compounds formed from the following sets of e...

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  7. What are ionic and molecular compounds? Give exmples.

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  8. (a) What is an ion ? How is an ion formed ? Explain with the help of t...

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  9. (a) What is the difference between a cation and an anion? Explain ...

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  10. Explain the formation of (i) sodium ion, and (ii) chloride ion, from ...

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  11. (a) Write the symbols/formulae of two simple ions and two compound io...

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  12. (a) Define 'formula unit' of an ionic compound. What is the formul...

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  13. The atomic number of an element X is 13. What will be the number of el...

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  14. Which of the following represents a correct chemical formula ?

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  15. If the number of electrons in an ion Z^(3-) is 10, the atomic number...

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  16. The anion of an element has :

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  17. A particle X has 17 protons, 18 neutrons and 18 electrons. This part...

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  18. An element which can exhibit valencies of 2, 4 and 6 can be :

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  19. The atomic number of an element E is 16. The number of electrons in i...

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  20. The cation of an element has :

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