1999
Which of the following movements can be described as random motion?
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1999 WAEC SSCE Chemistry Past Questions
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1999
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
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1999
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
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1999
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly
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1999
Which of the following compounds has the highest ionic character?
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1999
30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction
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1999
Helium is preferred to hydrogen in filling balloons because hydrogen
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1999
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]
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1999
Gas molecules are said to be perfectly elastic because
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1999
Equal volumes of CO2 cnd CO at s.t.p have the same
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1999
The property of calcium chloride which makes it useful as a drying agent is that it is
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1999
If the solubility of KHCO3 is 0.40 mole dm-3 at room temperature, calculate the mass of KHCO3 in 100 cm3 of the solution at this temperature. [KHCO3 = 100 g mol-1]
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1999
Which of the following compounds dissolves in water to form a solution with pH below 7?
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1999
Which of the following is an acid salt?
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1999
An exothermic reaction is one which involves
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1999
Equal volumes of water were added to one mole of each of the following compounds. Which of them produced the largest number of ions
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1999
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
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1999
What will be the effect of increase in pressure on the following system at equilibrium? 2NH3(g) ⇌ N2(g) + 3H2(g)
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1999
Consider the reaction represented by the following equation: H2(g) + I2(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
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1999
Which of the following lowers the activation energy of a chemical reaction?
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