Chemistry Test (011725)

56.00cm^{3} of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas? [Molar volume of a gas at S.T.P = 22.4dm^{3}

11.00

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22.00

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33.00

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44.00

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55.00

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A gaseous metallic chloride MCl_{x} consists of 20.22% of M by mass. The formula of the chloride is [M = 27, Cl = 35.5]

MCl

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MCl_{2}

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MCl_{3}

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M_{2}Cl_{6}

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How many grams of HBr would exactly be required to react with 2 g of propyne? (C=12, H=1, Br = 80)

4.1 g

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6.1 g

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8.1 g

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16.2 g

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The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N=14.0,0=16.0)

N_{2}O_{2}

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NO

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NO_{2}

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N_{2}O_{3}

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Phosphorus burns in oxygen according to the equation P_{4} + 50_{2} \to P_{4}O_{10}. How many litres of oxygen will be required at S.T.P for complete oxidation of 12.4g of phosphorus? [P = 31,0 = 16 and molar volume of a gas at S.T.P = 22.4 litres]

5.20

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11.20

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2.24

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20.20

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6.20

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10cm^{3} of CO is mixed and sparked with 100cm^{3} of air containing 21% O_{2}. If all the volumes measured at S.T.P. the volume of resulting gases would be?

90 cm^{3}

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100 cm^{3}

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105 cm^{3}

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110 cm^{3}

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115 cm^{3}

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How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500 cm^{3} of 6M HCI? (Mg=24, H=1, CI=35.5)

1.2 g

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0.7 g

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0.5 g

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0.3 g

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0.12 g

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The deliquescence property is most commonly observed in:

Non-polar compounds

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Hydrated salts

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All metals

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Anhydrous salts

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All types of salt

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Efflorescent substances are those that:

Absorb water from the air.

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Lose water of crystallization when exposed to air.

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Neither absorb nor lose water.

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Form a solution in the air.

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Which of the following is an example of a hygroscopic substance?

Sodium chloride

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Silica gel

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Potassium nitrate

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Sodium carbonate decahydrate

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Toluene

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