SECTION 1
2017 National 5 SQA Chemistry MCQS With Answers
1. In a reaction, the mass lost in 30 seconds was 2 g.
What is the average rate of reaction, in g s−, over this time?
- A 1/30
- B 30/2
- C 1/2
- D 2/30
Ans D
2. An atom has 21 protons, 21 electrons and 24 neutrons.
The atom has
- A atomic number 24 and mass number 42
- B atomic number 45 and mass number 21
- C atomic number 21 and mass number 45
- D atomic number 24 and mass number 45.
Ans C
3. What is the charge on the zinc ion in zinc dichromate, ZnCr2O7?
You may wish to use the data booklet to help you.
- A 2+
- B 2−
- C 1+
- D 1−
Ans A
4. The table contains information about magnesium and magnesium chloride.
When molten magnesium chloride is electrolysed at 730 °C the magnesium appears as a
- A solid on the surface of the molten magnesium chloride
- B solid at the bottom of the molten magnesium chloride
- C liquid at the bottom of the molten magnesium chloride
- D liquid on the surface of the molten magnesium chloride.
Ans D
5. Which of the following compounds is a base?
- A Sodium carbonate
- B Sodium chloride
- C Sodium nitrate
- D Sodium sulfate
Ans A
6. AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq)
Which of the following are the spectator ions in this reaction?
- A Ag+and Cl−
- B K+and NO3−
- C Ag+and NO3−
- D K+and Cl−
Ans B
7. x H2O2 y H2O + z O2
This equation will be balanced when
- A x = 1, y = 2 and z = 2
- B x = 1, y = 1 and z = 2
- C x = 2, y = 2 and z = 1
- D x = 2, y = 2 and z = 2.
Ans C
8. 0·25 moles of a gas has a mass of 7 g.
Which of the following could be the molecular formula for the gas?
- A C2H6
- B C2H4
- C C3H8
- D C3H6
Ans B
9. Which of the following solutions contains the least number of moles of solute?
- A 100 cm3 of 0·4 mol l−1solution
- B 200 cm3 of 0·3 mol l−1solution
- C 300 cm3of 1·0 mol l−1solution
- D 400 cm3of 0·5 mol l−1solution
Ans A
10. Which of the following could be the molecular formula for an alkane?
- A C7H16
- B C7H14
- C C7H12
- D C7H10
Ans A
11. A student added bromine solution to compound X and compound Y.
Which line in the table is correct?
Decolourises bromine solution immediately
Compound X Compound Y
- A no no
- B no yes
- C yes yes
- D yes no
Ans D
12. A compound burns in air. The only products of the reaction are carbon dioxide, sulfur dioxide
and water.
The compound must contain
- A carbon and sulfur only
- B carbon and hydrogen only
- C carbon, hydrogen and sulfur
- D carbon, hydrogen, sulfur and oxygen.
Ans C
13. Vinegar is a solution of
- A ethanol
- B methanol
- C ethanoic acid
- D methanoic acid.
Ans C
14. A reaction is exothermic if
- A energy is absorbed from the surroundings
- B energy is released to the surroundings
- C energy is required to start the reaction
- D there is no energy change.
Ans B
15. Which of the following diagrams could be used to represent the structure of copper?
Ans D
16. Which of the following metals is found uncombined in the Earth’s crust?
You may wish to use the data booklet to help you.
- A Tin
- B Magnesium
- C Gold
- D Sodium
Ans C
17. Which of the following is not an essential element for healthy plant growth?
- A Oxygen
- B Nitrogen
- C Potassium
- D Phosphorus
Ans A
18. The Haber process is the industrial process for the manufacture of
- A nitric acid
- B ammonia
- C alkenes
- D esters.
Ans B
19. Which of the following salts can be prepared by a precipitation reaction?
You may wish to use the data booklet to help you.
- A Barium sulfate
- B Lithium nitrate
- C Calcium chloride
- D Ammonium phosphate
Ans A
20. A solution of accurately known concentration is more commonly known as a
- A correct solution
- B precise solution
- C standard solution
- D prepared solution.
Ans B
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