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NCERT-ATOMS AND MOLECULES -Exercise
- Why is it not possible to see an atom with naked eyes?
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- Write down the formulae of (i) sodium oxide (ii) aluminium chlor...
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- Write down the names of compounds represented by the following formula...
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- What is meant by the term chemical formula?
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- How many atoms are present in a (i) H(2)S molecule and (ii) PO...
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- Calculate the molecular masses of H(2), O(2), Cl(2), CO(2), CH(4), C(2...
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- Calculate the formula unit masses of ZnO, Na(2)O, K(2)CO(3), given ato...
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- If one mole of carbon atoms weighs 12 grams, what is the mass (in gram...
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- Which has more number of atoms, 100 grams of sodium or 100 grams of ir...
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- A 0.24 g sample of compound of oxygen and boron was found by analysis ...
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- When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon diox...
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- What are polyatomic ions? Give examples.
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- Write the chemical formulae of the following. (a) Magnesium chlorid...
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- Give the names of the elements present in the following compounds. ...
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- Calculate the molar mass of the following substances. (a) Ethyne, ...
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- What is the mass of— (a) 1 mole of nitrogen atoms? (b) 4 moles ...
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- Convert into mole. (a) 12 g of oxygen gas (b) 20 g of water ...
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- What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole ...
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- Calculate the number of molecules of sulphur (S(8)) present in 16 g of...
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- Calculate the number of aluminium ions present in 0.051 g of aluminium...
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