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Write down the formulae of (i) sodium...

Write down the formulae of
(i) sodium oxide
(ii) aluminium chloride
(iii) sodium sulphide
(iv) magnesium hydroxide

Text Solution

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`Na_(2)O`
`AlCl_(3)`
`Na_(2)S`
`Mg(OH)_(2)`
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NCERT ENGLISH-ATOMS AND MOLECULES -Exercise
  1. Define the atomic mass unit.

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  2. Why is it not possible to see an atom with naked eyes?

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  3. Write down the formulae of (i) sodium oxide (ii) aluminium chlor...

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  4. Write down the names of compounds represented by the following formula...

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  5. What is meant by the term chemical formula?

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  6. How many atoms are present in a (i) H(2)S molecule and (ii) PO...

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  7. Calculate the molecular masses of H(2), O(2), Cl(2), CO(2), CH(4), C(2...

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  8. Calculate the formula unit masses of ZnO, Na(2)O, K(2)CO(3), given ato...

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  9. If one mole of carbon atoms weighs 12 grams, what is the mass (in gram...

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  10. Which has more number of atoms, 100 grams of sodium or 100 grams of ir...

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  11. A 0.24 g sample of compound of oxygen and boron was found by analysis ...

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  12. When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon diox...

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  13. What are polyatomic ions? Give examples.

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  14. Write the chemical formulae of the following. (a) Magnesium chlorid...

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  15. Give the names of the elements present in the following compounds. ...

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  16. Calculate the molar mass of the following substances. (a) Ethyne, ...

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  17. What is the mass of— (a) 1 mole of nitrogen atoms? (b) 4 moles ...

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  18. Convert into mole. (a) 12 g of oxygen gas (b) 20 g of water ...

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  19. What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole ...

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  20. Calculate the number of molecules of sulphur (S(8)) present in 16 g of...

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