CHEMCO exit exam questions and answers — Set 13
Set 13 of the Advanced Training for Chemical Tanker Cargo Operations (CHEMCO) exit exam bank — 17 of 377 questions, with the correct option marked. This bank is answer-only: the source published no usable explanations for it, so there are none here either. Read it end to end, jump to a single set, or search it — then sit the same bank as a timed paper. The real DG Shipping exit exam is 30 marks with 15 to pass.
These are the bank's original groupings. Practising deals the whole bank out again every time you reshuffle, so a practice “Set 3” is a different 30 questions each time — the set numbers below are the source file's, and are only used here so the key stays navigable. Options are listed in their original order with fixed letters; when you practise, those move too.
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Set 13 — 17 CHEMCO exit exam questions with answers
1. In solid solution, solute can be _______
- A. Liquid and Gas
- B. Liquid or gas
- C. Only solid
- D. Only liquid
2. Mixture of two or more substance in which composition can vary within a limit is called -------------------solution.
- A. Homogenous
- B. Heterogenous
- C. Nonvenomous
- D. Colloids are homogeneous mixtures where the particles are small enough that they stay suspended.
3. Which statement does not describe a property of a weak acid in solution?
- A. It forms a salt with sodium hydroxide.
- B. It has a pH of between 8 and 9.
- C. It is only partly dissociated into ions.
- D. It reacts with sodium carbonate to give off carbon dioxide.
4. Lube oils and additives group of cargoes (excluding halogenated, phosphated, and ester types) usually poses no problems for carriage in coated cargo tanks, but contamination of cargo may be a problem which requires
- A. Thorough venting of tanks during carriage
- B. Thorough cleaning and drying of tanks after discharging
- C. Thorough inerting of tanks before loading
- D. Thorough cleaning and drying of tanks before loading
5. When does an atom form ions ?
- A. Ions are formed when atoms lose or gain electrons
- B. When atoms lose electrons they become negatively charged ions and are named cations
- C. When atoms gain electrons they are negatively charged and are named anions.
- D. The number of electrons in an ion is different from the number of protons, thus ion does have an overall electric charge.
6. The reaction which absorbs the chemical energy is,
- A. Forward reaction
- B. Reverse reaction
- C. Exothermic reaction
- D. Endothermic reaction
7. Cargoes should not be loaded into a tank that is not specially for that purpose; if it exceeds normal atmospheric pressure at
- A. 60.0 Deg C (140 Deg F)
- B. 15.6 Deg C (60 Deg F)
- C. 25.0 Deg C (77 Deg F)
- D. 37.8 Deg C (100 Deg F)
8. Colder liquids hold more _________ than warmer liquid.
- A. Gases
- B. Liquid
- C. Pressure
- D. Water
9. In exothermic reactions heat is released due to ______ taking place in them.
- A. Cyclic reaction
- B. Irreversible reaction
- C. Physical reaction
- D. Chemical reaction
10. The system which contains uniform or same physical state of its matter is a
- A. Homogeneous system
- B. Hetrogeneous system
- C. Mixture
- D. Unisystem
11. In exothermic reactions, the amount of energy required for a chemical reaction is
- A. Equal to the the total energy released
- B. Greater than the total energy released
- C. Less than the total energy released
- D. Zero
12. The colour of the pH paper strip turned red when it was dipped into a sample. The sample could be:
- A. dil. Na2CO3 solution
- B. tap water
- C. dil. NaOH solution
- D. dil. HCI acid
13. Which reactants could be used safely to prepare potassium chloride?
- A. aqueous potassium hydroxide and dilute hydrochloric acid
- B. aqueous potassium sulphate and aqueous sodium chloride
- C. potassium and aqueous sodium chloride
- D. potassium and dilute hydrochloric acid
14. Modified epoxy or zinc silicate coated tanks may be required to carry some
- A. Lub oils
- B. Vegitable oils
- C. Unleaded Gasolines
- D. Animal oils
15. The product of coefficient of viscosity, surface area and the velocity difference between layers of flowing liquid is
- A. Viscosity of Liquid
- B. Force of friction between liquid layers
- C. Velocity of the fluid
- D. Vapor pressure of liquid
16. The reaction which releases the chemical energy is
- A. Forward reaction
- B. Reverse reaction
- C. Exothermic reaction
- D. Endothermic reaction
17. Some of these Solvents and Chemicals products require extreme care in the choice of
- A. Tank material
- B. Tank construction
- C. Tank coating and cargo handling
- D. Type of cargo pumps
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