4E5N MCQ Chem Challenge – Orange Dolphin

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Question 1 of 21

1. Question
A thermometer is placed in water and the temperature measured is 43^OC.

When an unknown solid X is added into the water, an endothermic change takes place and the temperature is observed to change by 4.5^OC.

What is the final temperature measured?

A 38.0^°C B 38.5^°C

C 47.0^°C D 47.5^°C
- A
- B
- C
- D
Correct

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Question 2 of 21

2. Question
Which one of the following has the same volume as one mole of fluorine gas?
- 35.5 g of chlorine gas
- 2 g of hydrogen gas
- 2 g of helium gas
- 8 g of oxygen gas
Correct

Incorrect
Question 3 of 21

3. Question
A student performs a series of experiments using catalysts. For each experiment he uses the same amount of reactants and the same amount of catalyst. He plots the graphs below from the results.

Which of the following best describe the graphs?
- The catalyst has no effect on the rate of the reaction.
- The catalyst alters the amount of products formed.
- The reaction is faster when the catalyst pieces are small.
- The catalyst alters both the rate of the reaction and the amount of products formed.
Correct

Incorrect
Question 4 of 21

4. Question
4. Part of some chemical reactions are shown.
Which reaction represents oxidation?

A Mg(s) → Mg²⁺(aq) B Cl₂(g) → 2Cl^–(aq)

C CO₂(g) → C(s) D Fe³⁺(aq) → Fe²⁺(aq)
- A
- B
- C
- D
Correct

Incorrect
Question 5 of 21

5. Question
48 dm³ of hydrogen is ignited in air.

2H₂ + O₂ → 2H₂O

What is the mass of water formed?
- 9 g
- 18 g
- 20 g
- 36 g
Correct

Incorrect

Question 6 of 21

6. Question

The reaction between iron(III) ions and iodide ions is represented by the equation.

2Fe³⁺ (aq) + 2I^– (aq) → 2Fe²⁺ (aq) + I₂ (aq)

Which statement is correct?

A	Fe³⁺ ions are oxidised by loss of electrons.
B	Fe³⁺ ions are reduced by gain of electrons.
C	I^– ions are oxidised by gain of electrons.
D	I^– ions are reduced by loss of electrons.

Correct

Incorrect

Question 7 of 21

7. Question
A student performs two reactions.

reaction 1: 10 g of magnesium ribbon with excess 2.0 mol/dm³ dilute hydrochloric acid.

reaction 2: 5 g of magnesium powder with excess 2.0 mol/dm³ dilute hydrochloric acid.

In both experiments, the volume of hydrogen produced, V, is measured against time, t, and the results plotted graphically.

Which set of graphs is correct?
- A
- B
- C
- D
Correct

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Question 8 of 21

8. Question
Propane burns completely in oxygen as shown in the equation.

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O (l)

If 0.3 mol of propane is burnt completely, what is the volume of gaseous product obtained at room temperature and pressure?

A

0.3 dm³

B

0.9 dm³

C

7.2 dm³

D

21.6 dm³
- A
- B
- C
- D
Correct

Incorrect
Question 9 of 21

9. Question
The following graph was obtained when potassium fluoride was dissolved in water.

Which of the following statements about the reaction is correct?
- The change is exothermic.
- The change is endothermic.
- Ice is formed and has melted.
- A redox reaction has taken place.
Correct

Incorrect
Question 10 of 21

10. Question
10 A student performs two reactions.

Reaction 1: 5 g of magnesium ribbon with excess 2.0 mol/dm³ dilute hydrochloric acid

Reaction 2: 5 g of magnesium powder with excess 2.0 mol/dm³ dilute hydrochloric acid

In both experiments, the volume of hydrogen produced, V, is measured against time, t, and the results plotted graphically.
- A
- B
- C
- D
Correct

Incorrect
Question 11 of 21

11. Question
In which pair of compounds is the underlined element in the same oxidation state?

A

CuCl₂ and NaCl

B

FeO and Fe₂(SO₄)₃

C

H₂S and SO₂

D

MnO₂ and MnCl₂
- A
- B
- C
- D
Correct

Incorrect
Question 12 of 21

12. Question
The reaction between calcium and aqueous zinc nitrate gives out heat energy.

Which energy level diagram accurately represents the reaction?
- A
- B
- C
- D
Correct

Incorrect
Question 13 of 21

13. Question
In which substance does carbon have the smallest oxidation number?

A

C

B

CO

C

CO₂

D

CaCO₃
- A
- B
- C
- D
Correct

Incorrect

Question 14 of 21

14. Question

In the graph shown below, curve Y represents the results of reacting excess of magnesium powder with 25 cm³ of 1.0 mol / dm³ sulfuric acid at 40 °C.

Which changes could produce curve Z?

A	Using 12.5 cm³ of 1.0 mol / dm³ sulfuric acid at 20 °C.
B	Using 12.5 cm³ of 1.0 mol / dm³ sulfuric acid at 60 °C.
C	Using 25 cm³ of 1.0 mol / dm³ sulfuric acid at 20 °C.
D	Using 25 cm³ of 1.0 mol / dm³ sulfuric acid at 60 °C.

Correct

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Question 15 of 21

15. Question
30 cm³ of 1.0 mol/dm³ of aqueous sodium hydroxide neutralises 25 cm³ of dilute hydrochloric acid.

NaOH + HCl → NaCl + H2O

What is the concentration of dilute hydrochloric acid?

A

0.80 mol/dm³

B

1.00 mol/dm³

C

1.20 mol/dm³

D

1.25 mol/dm³
- A
- B
- C
- D
Correct

Incorrect
Question 16 of 21

16. Question
Which graph represents the change in mass of flask against time when a conical flask containing aqueous sodium carbonate reacts with dilute nitric acid?
- A
- B
- C
- D
Correct

Incorrect

Question 17 of 21

17. Question

2 g of calcium carbonate granules reacts with excess 2.0 mol/dm³ of dilute hydrochloric acid.

Which condition decreases the rate of the reaction?

A	Increasing the volume of dilute hydrochloric acid.
B	Using 1.0 mol/dm³ of dilute hydrochloric acid.
C	Using 5 g mass of calcium carbonate.
D	Using powdered calcium carbonate.

Correct

Incorrect

Question 18 of 21

18. Question
Which reaction is not a redox reaction?
- Cl₂ + 2Br- → 2Cl- + Br₂
- Mg + 2HCl → MgCl₂ + H₂
- Ag+ + Cl- → AgCl
- 2Na + Cl₂ → 2NaCl
Correct

Incorrect
Question 19 of 21

19. Question
Dissolving ammonium nitrate in water is endothermic.

Which graph shows how the temperature alters as the ammonium nitrate is added to water and then the solution is left to stand?
- A
- B
- C
- D
Correct

Incorrect
Question 20 of 21

20. Question
Calcium carbonate was reacted with an excess of dilute hydrochloric acid at room temperature.

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

Two experiments were carried out.

Experiment 1: 100g of calcium carbonate in lumps

Experiment 2 : 50g of calcium carbonate as fine powder

Which of the graphs is correct?
- A
- B
- C
- D
Correct

Incorrect
Question 21 of 21

21. Question
In which reaction is the underlined substance behaving as an oxidising agent?

A        C (s) + CO₂(g) _→ 2CO (g)

B        Cl₂ (g) + 2I^– (aq) → I₂(aq) + 2Cl^–(aq)

C        Mg (s) + CuSO₄(aq) → MgSO₄(aq) + Cu (s)

D        NaOH (aq) + HNO₃(aq) → NaNO₃(aq) + H₂O (l)
- A
- B
- C
- D
Correct

Incorrect

A	0.3 dm³
B	0.9 dm³
C	7.2 dm³
D	21.6 dm³

A	CuCl₂ and NaCl
B	FeO and Fe₂(SO₄)₃
C	H₂S and SO₂
D	MnO₂ and MnCl₂

A	C
B	CO
C	CO₂
D	CaCO₃

A	0.80 mol/dm³
B	1.00 mol/dm³
C	1.20 mol/dm³
D	1.25 mol/dm³

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