Sec 4 Pure Chem TYS MCQ 2021 Set B
Quiz by HAO YI
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- Q1
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 inverted 20 cm3 burette filled with water
an inverted 250 cm3 measuring cylinder filled with water
a 50 cm3 gas syringe
place the apparatus on a balance and measure the loss in mass
60s - Q260s
- Q3
An aqueous solution of a salt is tested and the following results are obtained.
What is the cation in the salt?
Zn2+
NH4+
Ca2+
Al3+
60s - Q4
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?
3 and 4
1 and 2 only
1 only
1, 2 and 3
60s - Q560s
- Q6
Some properties of four substances are shown in the table.
Which substance is silver chloride?
A
B
C
D
60s - Q7
The following all contain covalent bonds.
1 ammonia
2 carbon dioxide
3 ethanol
Which contain only single covalent bonds?
1 only
1 and 3
1 and 2
3 only
60s - Q8
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'.
1 and 3 only
1 and 2 only
1, 2 and 3
2 and 3 only
60s - Q9
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?
57.7%
62.4%
31.2%
28.8%
60s - Q10
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?
atomic number of carbon, hydrogen and oxygen only
relative atomic masses of carbon, hydrogen and oxygen only
relative atomic masses of carbon, hydrogen and oxygen and relative molecular mass of X
atomic numbers of carbon, hydrogen and oxygen and relative molecular mass of X
60s - Q11
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?
The number of moles of magnesium sulfate formed is greatest in reaction 2.
The number of moles of magnesium sulfate formed is greatest in reaction 1.
The number of moles of magnesium sulfate formed is greatest in reaction 3.
The number of moles of magnesium sulfate formed is the same in all three reactions.
120s - Q12
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?
1200 cm3
600 cm3
240 cm3
120 cm3
120s - Q1360s
- Q14
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?
The energy released in breaking bonds is less than the energy absorbed in forming bonds.
The energy released in forming bonds is more than the energy absorbed in breaking bonds.
The energy released in breaking bonds is equal to z.
The energy released in forming bonds is labelled x.
60s - Q15
Iron reacts with dilute hydrochloric acid at a constant temperature of 25 oC.
Which statement about the rate of this reaction is correct?
It decreases as the reaction proceeds.
It decreases then increases as the reaction proceeds.
It increases as the reaction proceeds.
It remains the same as the reaction proceeds.
60s
