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Some Basic Concepts of Chemistry

Short Answer Type

41.

The vapour density of a gas A is four times that of B. If the molecular mass of B is M what is the molecular mass of A?

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42. Give the empirical formula of benzene and glucose.

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43.

How are empricial and molecular formulae related to each other?

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44.

In a certain compound, the percentage of an element (At. mass 12) is 92.3. What is its mole ratio?

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45. Two elements A (At. wt. 75) and B (At. wt. 16) combine to give a compound having 75·8%A. Calculate the relative number of atoms present in B.

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46.
How many litres of oxygen at S.T.P. will be required to burn completely 2.2g of propane?

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47. How many kilograms of caustic potash are required to completely neutralise 5 kg of hydrochloric acid?

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48.

A substance has empirical formula CH₂O, its vapour density is 30. What is its molecular formula?

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49.

Rewrite the following equation to make it more informative as far as possible:

$MgCO subscript 3 plus 2 HCl space rightwards arrow space MgCl subscript 2 plus straight H subscript 2 straight O space plus CO subscript 2$

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50.

What is stoichiometry?

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Previous Year Papers

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Short Answer Type

46. How many litres of oxygen at S.T.P. will be required to burn completely 2.2g of propane?

46.
How many litres of oxygen at S.T.P. will be required to burn completely 2.2g of propane?