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NECO SSCE Chemistry 2010 past questions and answers

This 2010 NECO SSCE Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2010 set with instant marking.

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Sample NECO SSCE Chemistry 2010 questions

1. During electrolysis of concentrated aqueous sodium chloride using inert electrodes, which product is formed at the anode?
  1. Hydrogen
  2. Chlorine
  3. Sodium
  4. Oxygen only

Answer: B. Chlorine

Chloride ions are preferentially discharged at the anode in concentrated brine, producing chlorine gas.

2. A current of 2.0 A flows for 965 seconds through a cell; how many moles of electrons pass through the circuit? (Faraday constant = 96500 C mol^-1)
  1. 0.010
  2. 2.00
  3. 0.200
  4. 0.020

Answer: D. 0.020

The charge is It = 1930 C, so the amount of electrons is 1930/96500 = 0.020 mol.

3. For the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), which change increases the equilibrium yield of ammonia?
  1. Increasing pressure
  2. Adding a catalyst only
  3. Increasing the volume
  4. Removing nitrogen

Answer: A. Increasing pressure

Higher pressure favors the side with fewer gas molecules, which is the ammonia side.

4. A catalyst speeds up a reaction mainly because it
  1. increases the enthalpy change
  2. raises the temperature permanently
  3. provides a pathway with lower activation energy
  4. increases the equilibrium constant

Answer: C. provides a pathway with lower activation energy

A catalyst offers an alternative reaction pathway with lower activation energy without changing the equilibrium constant.

5. What volume of 0.20 mol dm^-3 sodium hydroxide is needed to neutralize 25.0 cm^3 of 0.10 mol dm^-3 sulfuric acid?
  1. 12.5 cm^3
  2. 25.0 cm^3
  3. 50.0 cm^3
  4. 100.0 cm^3

Answer: B. 25.0 cm^3

Sulfuric acid supplies two moles of H+ per mole, so 0.0025 mol acid needs 0.0050 mol NaOH, equivalent to 25.0 cm^3.

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