A mixture of sand, ammonium chloride and sodium chloride is best separated by?
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1994
For a gas, the relative molecular mass is equal to 2Y. What is Y?
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1994
To what temperature must a gas 273 K be heated in order to double both its volume and pressure?
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1994
8g CH4 occupies 11.2 dm3 at s.t.p. What volume would 22 g of CH3CH3 occupy under the same condition?(C = 12, H = 1)
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1994
At the same temperature and pressure, 50 cm3 of nitrogen gas contains the same number of molecules as?
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1994
A pure solid usually melts?
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1994
Which of the following physical properties decreases down a group in the periodic table?
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1994
The number of electrons in the valence shell of an element of atomic number 14 is?
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1994
An increase in temperature causes an increase in the pressure of a gas because?
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1994
The shape of ammonia molecule is?
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1994
The densities of two gases, X and Y, are 0.5 g dm-3 and 2.0 dm-3 respectively.What is the rate of diffusion of X relative to Y?
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1994
The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolve in 100 g of the resulting mixture is?(K = 39, O = 16, N =14).
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1994
Sodium chloride has no solubility product value because of its?
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1994
A major effect of oil pollution in coastal waters is the?
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1994
A solid that absorbs water from he atmosphere and forms an aqueous solution is?
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1994
Element X, Y and Z belong to a groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ3?
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1994
What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?(Molar volume of gas = 22.4 dm3, F = 96,500 C mol-)
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1994
20 cm3 of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is?(Na = 23, C = 12, O = 16, H = 1)
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1994
Which of the following compounds is a base?
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1994
A few drops of concentrated PCI are added to about 10cm3 of a solution of pH 3.4. The pH of the resulting mixtures is?