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Work out the formulae for the following ...

Work out the formulae for the following compounds :
(a) Sodium oxide , (b) Calcium carbonate

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The correct Answer is:
(a) `Na_(2)O` , (b) `CaCO_(3)`
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Work out the formula for magnesium hydrogencarbonate.

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  2. An element X has a valency of 2. Write the simplest formula for : ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. The anion of an element has :

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

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

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

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