Sec 4 Pure Chem TYS MCQ 2023 set B
Quiz by HAO YI
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A student prepares a pure sample of sodium sulfate from dilute sulfuric acid and aqueous sodium hydroxide.Â
Which apparatus does the student use?
A flask contains solution X.
Solution X is a mixture of aqueous sodium hydroxide and aqueous sodium carbonate.
Which apparatus could be used on its own to determine the number of moles of sodium carbonate present in solution X?

Solution Y contains a mixture of flavourings. Solution Y and four other solutions, A, B, C and D, are analysed by chromatography.Â
The result is shown in chromatogram 1. The chromatogram is then sprayed with a locating agent. This is shown as chromatogram 2.Â
Which solution contains the same mixture of flavourings as solution Y?

Two tests on a white powder are shown.
1Â Â Â Â Â Aqueous sodium hydroxide is added and the mixture is warmed. The gas produced turns damp red litmus paper blue.Â
2Â Â Â Â Â The powder is dissolved in water. Dilute nitric acid followed by aqueous barium nitrate are added. A thick white precipitate is formed.Â
Which ions are present in the powder?
Sulfur dioxide, SO2, is dissolved in a little water to make a solution. The pH of the solution is tested.Â
Sulfur dioxide is then bubbled in to acidified potassium manganate(VII).
Which row identifies the pH of the solution and the observation with acidified potassium manganate(VII)?

What is observed if aqueous potassium iodide is added to aqueous silver nitrate?
The graph shows the temperature of a solid as it is heated.
Which change is labelled correctly?

Which gas diffuses most rapidly?
Which statement about diamond and silicon dioxide is correct?
Which property is shown by all ionically bonded metal compounds?
Which statement about covalently bonded substances is correct?
In the liquid state, which substance conducts electricity using mobile electrons?
What contains the smallest number of particles?
A chemical in a paint has the following composition.
What is its empirical formula?

100 cm3 of methane is burned in 150 cm3 of oxygen.
When cooled to room temperature, what could be the resulting mixture of gases?
Dilute aqueous sodium chloride is electrolysed using inert electrodes.Â
25.0 cm3 of hydrogen gas is produced at the negative electrode.
What is the maximum volume and identity of the gas produced at the positive electrode? (Assume all measurements are at the same temperature and pressure.)
The diagrams represent in the arrangement of particles in different substances at 300 oC.Â
Which substance can be electrolysed at 300 oC?
A simple cell is shown. The electrolyte is a mixture of aqueous copper(II) nitrate and aqueous zinc nitrate.Â
Which pair of reactions take place in the cell?

Ammonia is made from its elements in a reversible reaction.
The energy profile diagram for the formation of ammonia is shown.
Which statement about this reaction is correct?

50.0 cm3Â of hydrochloric acid has a pH of 1.0.
This acid requires 25.0 cm3 of aqueous sodium hydroxide to be neutralised.
A second 50.0 cm3 solution contains the weak acid, ethanoic acid.
The hydrochloric acid and ethanoic acid have the same concentration.
How will the pH of ethanoic acid and the volume of NaOH needed for neutralisation differ, if at all, from the hydrochloric acid?Â

Which method of preparation would be suitable for making these salts?

Two substances are mixed and warmed. No visible reaction occurs.
Aluminium foil is added and the mixture is warmed again. The observation is shown.
What are the two substances?

Which statement about the alkali metals is correct?
Part of the Periodic Table is shown.
Which statement about the elements P, Q, R and S is correct?

Iron, nickel and chromium are all transition elements.Â
Which properties illustrate this?
1Â Â Â Â Iron reacts with dilute hydrochloric acid to form hydrogen.
2Â Â Â Â Nickel(II) chloride solution is green.
3Â Â Â Â Chromium has oxidation states of +2, +3 and +6.
The diagrams represent atoms in pure gold and atoms in an alloy of gold and copper.
Which statement is correct?

Brass is an alloy of copper and zinc.
In an experiment, a brass rod is placed separately in contact with four different metals in an electrolyte.Â
Which metal, when in contact with the brass rod, will result in both metals in brass corroding?

The diagram shows the fractional distillation column used to separate petroleum into useful fractions.
Which fractions are produced at positions X, Y and Z in the column?

Which molecular formulae have exactly two isomers?
1Â Â Â Â Â Â C3H8
2Â Â Â Â Â Â C4H8
3Â Â Â Â Â Â C4H10Â
The hydrocarbon C16H34 is cracked to form these products, X, Y and Z. The equation is shown.
Z is used to convert unsaturated vegetable oils into a solid product.
Which row is correct?

An alcohol is completely combusted in excess oxygen. Two products are formed, 1.65 g of carbon dioxide and 0.90 g of water.
What is the formula of the alcohol?
Butene, CH2CHCH2CH3, is reacted with steam in the presence of an acid catalyst to form compound P.
Compound P reacts with propanoic acid to form ester Q.
What could be the structure of ester Q?

Compound R has the empirical formula C2H4O.
What could be the identity of R?
1Â Â Â Â butanoic acid
2Â Â Â Â ethanoic acid
3Â Â Â Â ethanol
4Â Â Â Â ethyl ethanoate
Which statement about ozone, O3, is correct?