The reaction between hydrogen and oxygen is shown by the following equation?
2H2 + O2 → 2H2O
Which volume of oxygen will react exactly with 56 dm3 of hydrogen?
A. 84 dm3
B. 56 dm3
C. 28 dm3
D. 14 dm3
In which of the following reactions is the underlined substance reduced?
A. 2Fe2+ + Cl2 → 2Fe3+ + 2Cl–
B. H+ + OH– → H2O
C. 4HCl + MnO2 → MnCl2 + Cl2 + H2O
D. Mg + 2H+ → Mg2+ + H2
Which ions are present in an aqueous solution of sulphuric acid?
A. H+, OH–, HSO4–
B. H+, SO42-
C. H+, SO42-, OH–
D. OH–, SO42-
Which of the following correctly shows the reactivity series for copper, magnesium, aluminium and zinc?
A. aluminium, copper, magnesium, zinc
B. copper, magnesium, zinc, aluminium
C. magnesium, aluminium, zinc, copper
D. zinc, aluminium, copper, magnesium
Which one of the following reactions involved in the extraction of iron in the blast furnace does not involve either oxidation of reduction?
A. 2FeO + C → 2Fe + CO2
B. CaO + SiO2 → CaSiO3
C. FeO + CO → Fe + CO2
D. Fe2+ + 2e– → Fe
Four aqueous solutions have pH values shown in the table below
If pairs of the solutions are mixed, which pair must produce an acidic solution?
A. P and Q
B. P and R
C. P and S
D. Q and R
Vegetable oils are unsaturated hydrocarbons. Which of the following tests would best show this?
A. They burn in air to form carbon dioxide and water.
B. They make a translucent patch on a filter paper.
C. They react with bromine water and decolourise it.
D. They react with hydrogen to form solids.
The table shows the number of protons, neutrons and electrons for four particles numbered (i) to (iv).
Which one of the following pairs of particles combine to given an ionic solid?
A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. (ii) and (iv)
Which of the following masses contains the greatest number of moles of atoms (Mr = relative molecular mass)
A. 8g Helium, He (Mr = 4)
B. 16g Oxygen, O2 (Mr = 32)
C. 64g Sulphur dioxide, SO2 (Mr = 64)
D. 36g Water, H2O (Mr = 18)
Which one of the following oxides, when dissolved in water, gives a solution with the lowest pH?
Which of the following pairs of substances would react to form a salt and water only?
A. Aqueous sodium carbonate and sulphuric acid.
B. Aqueous sodium hydroxide and dilute ethanoic acid.
C. Iron and steam.
D. Zinc and dilute hydrochloric acid.
Oxygen can be separated from nitrogen by the fractional distillation of liquid air. This is possible because:
A. Air contains up to 80% by volume of nitrogen.
B. Nitrogen is an inert element.
C. Oxygen is denser than nitrogen.
D. Oxygen has a higher boiling point than nitrogen.
Which of the following is not a hydrocarbon?
A. Candle wax
What is air?
A. A compound
B. An element
C. A mixture
D. An isotope
Elements P and Q combine by ionic bonding. P and Q belong to which groups in the periodic table?
Which of the following data concerning elements and the electron structures of their atoms is not correct?
A particle contains 13 protons, 14 neutrons and 13 electrons. Which of the following agree with the structure?
A. A metal atom
B. A metal ion
C. A noble gas
D. A nonmetal ion
A substance is classified an acid if:
A. Accepts protons (H+)
B. Donates protons
C. Forms a solution of pH greater than 7
D. Reacts with a metal