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The formula of aluminium oxide is:

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Important Questions on Atoms and Molecules

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The formulae of an oxide of an element M is MO. The formulae of its phosphate is
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If the vapour density of the carbon containing gaseous substance is 13, which of the following is its molecular formula?
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Find the empirical formula and the molecular formula of an organic compound from the data given below:

C = 75.92%,  H = 6.32%  and  N = 17.76%

The vapour density of the compound is 39.5.  [C = 12,  H = 1,  N = 14]

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A solution of a substance 'X' is used for whitewashing.

(a) Name the substance 'X' and write its formula.

(b) Write the reaction of the substance with water.

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