2003 NECO SSCE Chemistry Past Questions

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2003

What change will occur during the electrolysis of brine using carbon electrodes?

2003

Which metal is a constituent of both bronze and solder?

2003

An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?

2003

What is the order of increasing reactivity of benzene, ethene and ethyne with bromine at room temperature?

2003

Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?

2003

Which method is used for the purification of copper from its ore?

2003

What is the concentration (in mol dm3) of a solution containing 28 g of potassium hydroxide per 100 cm3 of solution? (K=39; H=1; 0=16)

2003

At s.t.p, a mole of chlorine occupies 22.4dm3. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]

2003

Which separation technique is routinely applied in the petroleum industry?

2003

Which metal is extracted from bauxite?

2003

Why is tetraoxosulphate(VI) acid NOT used for making carbon dioxide from calcium carbonate? It is

2003

Which hydrocarbon does NOT exhibit structural isomerism?

2003

What is formed when starch is completely hydrolysed?

2003

In the reaction 2H2S(g) + SO2(g) → 2H2O(l) + 3S(s), SO2 is acting as _agent

2003

What is the change in the oxidation number of phosphorus in the following reaction?4P(s) + 5O2(ag) → 2P2O5(s)

2003

Chlorine displaces bromine from aqueous potassium bromide because

2003

The pH of water is 7.What is the pH of orange juice?

2003

Small amounts of compounds of transition metals are sometimes added to glass during manufacture in order to make the glass

2003

What is the number of moles of NaHCO3in 250cm3 of its solution if the solution contains 8.4 g of NaHCO3 in 1 dm3 of the solution. [Na = 23, 0 = 16, C = 12, H = 1)

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