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C > Multiple Choice > Flashcards

Multiple Choice Flashcards

1
Q

Which element is in the d-block of the Periodic Table?

A

Tantalum

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2
Q

Which species contains an element with an oxidation state of +4?

A

H2SO3

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3
Q

There are 392 mol of pure gold in a bar measuring 10 cm by 10 cm by 40 cm.
What is the density of gold in kg dm−3?

A

19.3

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4
Q

The successive ionisation energies for element X are shown in Figure 3. Which element is X?

A

Aluminium

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5
Q

Which of these decreases down Group 2?

A

First ionisation energy

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6
Q

In the balanced equation the mole ratio for sulfuric acid to water is

A

4 : 7

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7
Q

What is the reducing agent in this reaction?

A

(C2O4)^2−

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8
Q

When the syringe is placed in a hot oven the mixture becomes darker in colour.
Which of the following statements is correct?

A

NO2 is brown and the forward reaction is exothermic.

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9
Q

30 cm3 of xenon are mixed with 20 cm3 of fluorine. The gases react according to
the following equation. Assume that the temperature and pressure remain constant.
Xe(g) + F2(g) → XeF2(g)
What is the final volume of gas after the reaction is complete?

A

30 cm3

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10
Q

If 2.00 mol of sodium azide react in this way, how many molecules of N2 will be
formed?
(The Avogadro constant L = 6.022 x 1023 mol−1)

A

1.93 x 1024

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11
Q

Which of the following compounds would form an orange-red precipitate when
heated with Fehling’s solution?

A

CH3CHO

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12
Q

Propene can be made by the dehydration of propan-2-ol.
What is the percentage yield when 30 g of propene
(Mr = 42.0) are formed from
50 g of propan-2-ol (Mr = 60.0)?.

A

86%

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13
Q 
Sulfur dioxide (SO2) is produced when some fossil fuels are burned.
Which of the following statements is true?
A

Sulfur dioxide can be removed from waste gases in a power station by an acid-base reaction with calcium oxide.

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14
Q

Which of the following is a correct mechanism for the formation of 2-methylbut-2-ene from 2-bromo-3-methylbutane?

A

B

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15
Q

An organic compound is found to contain 40.0% carbon, 6.7% hydrogen and 53.3% oxygen.
Which of the following compounds could this be?

A

Ethanoic acid

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16
Q

Which of the following molecules would form a polymer containing this repeating unit?

A

Methylpropene

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17
Q

igure 7 shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.
Which of the following statements is true?

A

The area under the curve to the right of EA represents the number of molecules with enough energy to react.

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18
Q

Tetradecane (C14H30) is an alkane found in crude oil. When tetradecane is heated to a high temperature, one molecule of tetradecane decomposes to form one
molecule of hexane and three more molecules.
Which of the following could represent this reaction?

A

A

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19
Q

Which of the following is the general formula of cyclic alkenes such as cyclohexene?

A

CnH2n-2

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20
Q

A mixture of 10 mol of A and 10 mol of B were left to reach equilibrium. The equilibrium mixture contained 4 mol of B.
What is the total amount, in moles, of substances in the equilibrium mixture?

A

18

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21
Q

The Mr of hydrated copper sulfate (CuSO4.5H2O) is 249.6.

Which of the following is the mass of hydrated copper sulfate required to make 50.0 cm3 of a 0.400 mol dm−3 solution?

A

4.99 g

22
Q

Which of the following shows how the equilibrium yield of hydrogen and the value of the equilibrium constant are affected by the changes shown?

A

Increase temperature

23
Q

Use the information in Table 3 and the stated enthalpy change to calculate the missing bond enthalpy.

A

1064

24
Q

2 mol of ideal gas X are stored in a flask of fixed volume.
Which of the following changes would lead to the greatest increase in pressure
inside the flask?

A

Removing 0.5 mol of gas X and increasing the temperature from 20 °C to 300 °C

25
Q

Which of these atoms has the largest atomic radius?

A

Na

26
Q

Which of these species is the best reducing agent?

A

I–

27
Q

Use your understanding of intermolecular forces to predict which of these compounds has the highest boiling point.

A

HF

28
Q

Which type of bond is formed between N and B when a molecule of NH3 reacts with a molecule of BF3?

A

Co-ordinate.

29
Q

Which of these atoms has the highest electronegativity?

A

Cl

30
Q

Which of these atoms has the smallest number of neutrons?

A

4Li

31
Q

Which of these substances does not show hydrogen bonding?

A

CH3COOH

32
Q

What is the formula of calcium nitrate(V)?

A

Ca(NO3)2

33
Q

Which of these elements has the highest second ionisation energy?

A

Na

34
Q

Which of the following shows chlorine in its correct oxidation states in the compounds shown?
HCl KClO3 HClO

A

–1 +5 +1

35
Q

Which substance is not produced in a redox reaction when solid sodium iodide reacts with concentrated sulfuric acid?

A

HI

36
Q

Which of the following contains the most chloride ions?

A

calcium chloride solution

37
Q

Which of these samples of gas contains the largest number of molecules?
The gas constant R = 8.31 J K–1 mo

A

10^5 Pa and 400 K

38
Q

Which of these substances has permanent dipole-dipole attractions between molecules?

A

(CH3)2CO

39
Q

What is the total volume of gas remaining after 20 cm3 ethane are burned completely in 100 cm3 oxygen?
All volumes are measured at the same pressure and the same temperature, which is above 100 °C.

A

130 cm3

40
Q

Consider the reaction between propene and hydrogen bromide to form the major product.
Which species is formed in the mechanism of this reaction?

A

–CH3

41
Q

Which of these substances reacts most rapidly to produce a silver halide precipitate with acidified silver nitrate?

A

CH3I

42
Q

Which statement about E-1,2-dichloroethene is correct?

A

It forms a polymer with the same repeating unit

as Z-1,2-dichloroethene.

43
Q

Which statement about ethene is correct?

A

It burns in excess oxygen to produce carbon dioxide and water.

44
Q

Which statement about ethanal is correct?

A

It reacts with Tollens’ reagent to form silver.

45
Q

Which of these substances does not contribute to the greenhouse effect?

A

Nitrogen.

46
Q

Prepare ethylamine. Which of the curly arrows in the mechanism is not correct?

A

4

47
Q

Which statement about the reaction is not correct?

A

Using an excess of bromoethane will prevent further reaction to form a mixture of amine products

48
Q

Which letter best represents the mean energy of the molecules?

A

C

49
Q

What does the area under the curve represent?

A

The total number of particles.

50
Q

What is likely to decrease the accuracy of the experiment?

A

Rinsing the flask with acid before each new experiment

51
Q

The experiment was repeated at 20 °C using a 250 cm3 conical flask.
Which statement is correct about the time taken for the cross to disappear when using
the larger conical flask?

A

The time taken will be increased by using the larger conical flask.

C (6 decks)

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