Title: Inorganic Section

Q: Iron trichloride (FeCl_3) is:
- a Lewis acid
- a Bronsted acid
- a Lewis base
- a Bronsted base
- neutral (neither base nor acid)
A: a Lewis acid

Q: Thiocyanates can form a number of toxic gases upon contact with acids, including carbonyl sulfide (OCS) and sulfur dioxide. Which of the following gases will form when ammonium thiocyanate reacts with a base (such as sodium hydroxide)?
- methane
- ammonia
- nitrogen
A: ammonia

Q: A solution of potassium dichromate in water can safely be disposed of by pouring it down the sink.
- True
- False
A: False
Feedback: Chromium is a heavy metal and must be disposed of as heavy metal waste.

Q: In the formation of Na_2[Cu(OH)_4] in step 3, the initially formed Cu(OH)_2 functions as ...
- ... a Lewis acid. (A Lewis acid is an electron pair acceptor.)
- ... a Lewis base. (A Lewis base is an electron pair donor.)
- ... a Bronsted base. (A Bronsted base is a proton (hydrogen ion) acceptor.)
- ... a Bronsted acid. (A Bronsted acid is a proton (hydrogen ion) donor.)
A: ... a Lewis acid.

Q: What is the correct formula for oxalic acid?
- H(O)C-O-COOH
- HOOC-COOH
- H(O)C-O-O-C(O)H
- HOOC-CH3
A: HOOC-COOH

Q: In the preparation of tetraethylammonium tetrachloromanganate, what happens to the oxidation state of manganese?
- It is oxidised.
- The oxidation state remains unchanged.
- It is reduced.
A: The oxidation state remains unchanged.

Q: MnCl_2^.4 H_2O is classed as a dangerous good. It is regarded to be:
- toxic
- corrosive
- a flammable solid
- an oxidizing agent
A: toxic
Feedback: Check the risk assessment for experiment I2 for safety information (on LMS).

Q: The boiling point of methanol is approximately:
- between 40 and 50 degrees celsius
- between 50 and 60 degrees celsius
- between 60 and 70 degrees celsius
- between 70 and 80 degrees celsius
- between 80 and 90 degrees celsius
A: between 60 and 70 degrees celsius

Q: What is the safest method to heat a beaker of ethanol?
- Placing the beaker on a hotplate and setting the temperature to 80 degrees C.
- Covering the beaker with a watchglass and placing it in an oven at 120 degrees C for 5 minutes.
- Placing the beaker above a bath of boiling water (steam bath).
A: Placing the beaker above a bath of boiling water (steam bath).
Feedback: Ethanol is highly flammable (dangerous goods class 3).

Q: Which of the steps in experiment I3 should be carried out in the fumehood?
- Preparing the methanolic solution of acetylacetone.
- Adding sodium acetate to the FeCl3/acetylacetonate solution.
- Vacuum filtration of the iron complex (the product).
A: Preparing the methanolic solution of acetylacetone.; Adding sodium acetate to the FeCl3/acetylacetonate solution.

Q: In step 4 of experiment I4, you will filter a concentrated sodium hydroxide solution using glass fibre filter paper because normal filter paper would disintegrate too quickly. What is the major chemical component of paper?
- cellulose
- starch
- saccharose
- polyphenols
A: cellulose

Q: What will happen when you dissolve solid sodium hydroxide (NaOH) in water?
- The temperature of the water (or the solution) will increase.
- The temperature of the water (or the solution) will decrease.
- The temperature of the water (or the solution) will not change.
A: The temperature of the water (or the solution) will increase.
If right: Good. What does this mean for your safety in performing step 1 of the preparation procedure?

Q: Potassium dichromate is classified as a dangerous good. It is regarded to be:
- explosive
- corrosive
- carcinogenic
- toxic
A: carcinogenic; toxic
Feedback: Check the risk assessment for experiment 1 for safety information (on LMS).

Q: Acetylacetonate acts as a bidentate ligand. What does this mean?
- It forms two coordinative bonds to the metal.
- It has an oxidation state of +2.
- It has a total charge of -2.
- It exists in two isomeric forms.
A: It forms two coordinative bonds to the metal.

Q: Barium hydroxide hexahydrate is classed as a dangerous good. It is regarded as:
- toxic
- corrosive
- a flammable solid
- radioactive
A: toxic; corrosive