2012
Which of the following statements about a radioactive substance is/are correct? l. lt emits radiation continuously and spontaneously. ll. The emitted radiations are affected by temperature and pressure III. The radiation…
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2012 WAEC SSCE Chemistry Past Questions
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2012
The number of sulphur atoms in 3.20g of SO2(g) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 X 1023]
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2012
Consider the following reaction equation: CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(l) + CO2(g). What mass of CaCI2 would be obtained when 25.0g of CaCO3(s) is reacted with excess HCI(aq)? [CaCO3 = 100; CaCI2 = 111]
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2012
MgO does not readily dissolve in water because
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2012
The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together
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2012
The complex compound formed when aluminium dissolves in aqueous sodium hydroxide is
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2012
Which of the following metals would readily displace hydrogen from steam?
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2012
A metal M forms two types of chlorine, MCI2 and MCI3 which of the following laws best explains the relationship between the chlorides? Law of
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2012
A sample of a gas may be identified as chlorine if it turns
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2012
The formula of mercury (l) dioxonitrate (III) is
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2012
Consider the reaction represented by the following equation: xCH3OH + yO2 → 2CO2 + zH2O. The values of x,y and z respectively, are
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2012
Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]
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2012
The postulate that molecules are in constant random motion best explains why liquids
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2012
At ordinary temperature H2O is a liquid while H2S is a gas. This is because H2O has
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2012
When a substance changes directly from the solid state to the gaseous state without forming a liquid, the substance is said to
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2012
The volume occupied by 0.4 g of hydrogen gas at s.t.p. is [H = 1. 00; Molar volume at s.t.p. = 22.4 dm3]
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2012
The hydrolysis of NH4Cl gives
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2012
Which of the following pH values indicates that a solution is a strong base?
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2012
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except
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2012
A substance L reacts with NH4NO3(aq) to generate ammonia gas. L is likely to be
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