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Sec 4 Pure Chem TYS MCQ 2021 Set B
Quiz by HAO YI
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A student follows the rate of the reaction when 0.19g of magnesium reacts with excess acid at room temperature and pressure.
What is most suitable for measuring the volume of gas produced at different times during this experiment?
An aqueous solution of a salt is tested and the following results are obtained.
What is the cation in the salt?
The rate of diffusion of give gases is measured. The gases are CO, CO2, C2H4, C3H8 and N2.
The list gives four pairs of gases.
1 CO and C2H4
2 CO and N2
3 CO2 and C3H8
4 C2H4 and C3H8
In which pairs would both gases diffuse at the same rate, under the same conditions of temperature and pressure?
Some properties of four substances are shown in the table.
Which substance is silver chloride?
The following all contain covalent bonds.
1 ammonia
2 carbon dioxide
3 ethanol
Which contain only single covalent bonds?
Which statements about metals are correct?
1 Metals are not malleable.
2 Metals conduct thermal energy.
3 Metals have a lattice of positive ions in a 'sea of electrons'.
Basic copper carbonate, Cu2CO3(OH)2, is used as a pigment in paint.
What is the percentage by mass of copper in basic copper carbonate?
Analysis of molecule X shows that it contains, by mass, 52% carbon, 13% hydrogen and 35% oxygen.
Which other information is needed to determine the molecular formula?
An excess of dilute sulfuric acid is added separately to the following reagents.
reaction 1 1.2 g of magnesium
reaction 2 2.0 g of magnesium oxide, then warmed
reaction 3 4.2 g of magnesium carbonate
Each reaction produces 100% yield of the products.
Which statement is correct?
Which volume of carbon dioxide gas, at room temperature and pressure, is produced when 2.65 g sodium carbonate reacts with 100 cm3 of 0.10 mol/dm3 hydrochloric acid?
Methane burns in oxygen to form carbon dioxide and water. The energy profile diagram is shown.
Which statement about bond breaking and forming is correct?
Iron reacts with dilute hydrochloric acid at a constant temperature of 25 oC.
Which statement about the rate of this reaction is correct?
Chlorine is reacted with aqueous potassium iodide and a brown solution is formed.
Which statement about this reaction is correct?
Beryllium hydroxide is an amphoteric white solid.
Which reagent can be used to distinguish beryllium hydroxide from solid calcium hydroxide?
1 HCl(aq)
2 HNO3(aq)
3 KOH(aq)
4 NaOH(aq)
Salt P can be prepared by reacting together:
- a dilute acid and a metal or
- an acid and an insoluble carbonate.
A pure sample of salt P is then obtained by filtration, followed by crystallisation of the filtrate.
What is salt P?
The energy profile diagram for the formation of ammonia is shown.
What is the value of the activation energy for the decomposition of ammonia into its elements?
A small piece of lithium is added to aqueous ammonium chloride.
Two gases are produced and tested.
Which row identifies the expected observations for the gases produced?
The table shows data for atoms or ions of the elements P, Q, R and S. The letters do not represent the chemical symbols of the elements.
Which statement is correct?
Arc welding is a process which uses electricity to make high temperatures to melt two pieces of metal so that they can be joined.
Argon is blown onto the surface where the molten metals are joining.
Why is argon used?
Which statement about the Group 17 elements are correct?
1 Bromine reacts with iodide ions to form iodine.
2 The elements become more reactive down the group.
3 Bromine is a liquid while iodine is a solid at room temperature.
An ionic chloride of element Z has the formula ZCl.
When ZCl is added to water and swirled, a coloured solution appears. The formula of the coloured solution is ZCl2.
The diagram shows part of the Periodic Table.
Which letter identifies element Z?
The arrangement of atoms in pure iron is shown.
Steel can be made by adding carbon to pure iron.
Which description of the arrangement of atoms in steel is correct?
Copper(II) oxide is reduced to copper as shown. The burner is then turned off but the hydrogen is kept flowing until the tube is cold.
What is the main reason why the hydrogen is kept flowing?
Which metal forms the most thermally stable carbonate?
The depletion of the ozone layer can result in an increase in cases of skin cancer.
What is the reason for this?
Which row shows air pollutants and their sources?
Acidified potassium manganate(VII) changes from purple to colourless when it is added to substance X.
What can be determined about substance X from this observation?
Propene is used to make poly(propene).
Which fraction from petroleum is the main feedstock for the manufacture of propene?
Which statement about the formulae of some organic compounds are correct?
1 The general formula of an alkene is CnH2n+2.
2 The empirical formula of butene is CH2.
3 The molecular formula of propanol is C3H7O.
Which structure is an isomer of butane?
X reacts with steam to form Y.
Y is oxidised to Z.
If Z is propanoic acid, what is the formula of X?
Addition of hydrogen to an unknown alkene gives the alkane (CH3)3CH.
What is the unknown alkene?
Statins are compounds used in some medicines.
An example of a statin is shown.
Which part of the structure shows the functional group found in carboxylic acids?
Q is a compound that forms a gas when added to aqueous sodium carbonate.
What is true about Q?
The table refers to the polymers nylon and poly(ethene).
Which row is correct?
