Question 1

Phosgene $(COCl_2)$ can be prepared from a reaction between carbon monoxide and chlorine:
Which of the following will increase the yield of phosgene at equilibrium?

Accepted Answer

Decreasing the volume of the system

Answer

Adding argon gas into the system to increase the pressure

Answer

Removing carbon monoxide from the system

Answer

Increasing the temperature of the system

Question 2

Which of the following is a conjugate acid/base pair that can act as a buffer?

Accepted Answer

$NH^+_4/NH_3$

Answer

$SO^{2-}_4/SO_3^{2-}$

Answer

$H_3PO_4/PO_4^{3-}$

Answer

$HNO_4/NO_3^-$

Question 3

Consider the following organic compound where two of the carbon atoms have been labelled as $C^a$ and $C^b$:
Which row of the following table correctly shows the type of shape formed by the bonds around
the $C^a$ and $C^b$ atoms?

Accepted Answer

$C^a$: Tetrahedral ; $C^b$: Linear

Answer

$C^a$: Trigonal planar ; $C^b$: Linear

Answer

$C^a$: Tetrahedral ; $C^b$: Tetrahedral

Answer

$C^a$: Linear  ; $C^b$: Trigonal planar

Question 4

Which of the following species is NOT amphiprotic?

Accepted Answer

$CH_3COO^–$

Answer

$H_2O$

Answer

$HCO_3^–$

Answer

$HPO_4^{2–}$

Question 5

Which of the following options contains a pair of structural isomers where the boiling point of the first compound is lower than that of the second compound?

Accepted Answer

2-methylpropane and butane

Answer

Propan-1-ol and propan-2-ol

Answer

Pentanoic acid and hexanoic acid

Answer

Butanoic acid and ethyl ethanoate

Question 6

Consider the following reaction: In an experiment, 6.0 moles of $N_2O_4$ and 1.0 mole of $NO_2$ was injected into a 0.50 L container
at $100^0C$ and allowed to react until equilibrium was attained. The equilibrium constant for this reaction is 0.212 at $100^0C.$
Which row of the following table correctly identifies the direction in which the reaction will proceed to reach equilibrium and the reason for this shift?

Accepted Answer

direction favored left due to Q > K

Answer

direction favored right due to Q > K

Answer

direction favored right due to Q < K

Answer

direction favored left due to Q < K

Question 7

A laboratory contains solutions of a weak monoprotic acid (HA) and a strong monoprotic acid (HB), both at the same volume and concentration. Which of the following statements regarding these two solutions is correct?

Accepted Answer

Both solutions would be neutralised by the same volume of 0.10 mol L–1 NaOH

Answer

HA has a lower pH than HB

Answer

HA has a higher hydronium ion concentration than HB

Answer

The concentration of $A^–$ in HA is higher than the concentration of $B^–$ in HB

Question 8

Benzoic acid $(C_6H_5COOH)$ is a weak monoprotic acid that can be used as a primary standard for titrations. A 0.15 mol/L solution of benzoic acid has a pH of 2.51. What is the $pK_b$ of the benzoate $(C_6H_5COO^–)$ ion?

Accepted Answer

9.81

Answer

3.60

Answer

10.40

Answer

4.19

Question 9

A sample of magnesium hydroxide was added to 0.0500 mol/L sodium hydroxide solution and only some of the magnesium hydroxide dissolved. What is the solubility of magnesium hydroxide in this solution?

Accepted Answer

2.24 × $10^{−9}$ mol/L

Answer

4.52 × $10^{−9}$ mol/L

Answer

3.38 × $10^{−9}$ mol/L

Answer

5.26 × $10^{−9}$ mol/L

Question 10

In a particular titration, a base from a burette was delivered into a conical flask containing an acid. The conductivity curve below was produced from monitoring the conductivity of the conical flask solution during the titration. Which of the following titrations would produce the conductivity curve above?

Accepted Answer

HCl + $NH_3$

Answer

$CH_3COOH$ + $NH_3$

Answer

$CH_3COOH$ + KOH

Answer

HCl + KOH

Question 11

Consider the following organic compound:
What is the systematic name of this compound?

Accepted Answer

1-bromo-5,5-difluoro-3-methylpentan-2-amine

Answer

1-bromo-5,5-difluoro-3-methylpentan-2-amide

Answer

5-bromo-1,1-difluoro-3-methylpentan-4-amine

Answer

5-bromo-1,1-difluoro-3-methylpentan-4-amide

Question 12

Consider the following titration curves that are produced from two different titrations: Which row of the following table contains an indicator that would be suitable for BOTH titrations?

Accepted Answer

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Answer

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Answer

https://uploads.quizalize.com/ce2b13b9-7afe-474f-8c2e-665284e8add3/question/275fd449546a605f9d1cdcd3592bc1d6ac2bd10a.JPG

Answer

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Question 13

In a calorimetry experiment, butan-1-ol was completely combusted to heat 150.0 mL of water from $20.0^0C$ to $70.0^0C$. The molar heat of combustion of butan-1-ol is 2670 kJ/mol.

If only 65.0% of the heat released by the combustion was absorbed by the water, what volume of carbon dioxide gas was produced at $25^0C$ and 100 kPa?

Accepted Answer

1.79 L

Answer

1.64 L

Answer

1.06 L

Answer

1.16 L

Question 14

A 25.0 mL solution of 0.15 mol/L hydrochloric acid was mixed with a 20.0 mL solution of 0.20 mol/L potassium hydroxide.
What is the pH of the resultant solution?

Accepted Answer

11.74

Answer

3.60

Answer

2.26

Answer

10.40

Question 15

Consider the following series of reactions where A to D are different organic compounds. Based on the above information, the identity of compound C is:

Accepted Answer

2-bromopropane

Answer

1-bromopropan-1-ol

Answer

1-bromopropane

Answer

2-bromopropan-2-ol

Question 16

A white solid was added to nitric acid and bubbling was observed. When the resultant mixture was tested with a flame test, a brick red flame colour was observed.
What is the most likely identity of the white solid?

Accepted Answer

Calcium carbonate

Answer

Calcium sulfate

Answer

Barium carbonate

Answer

Barium sulfate

Question 17

In an experiment, 0.570 g of an unknown sample was analysed for its phosphate content. Excess calcium nitrate was added to an aqueous solution of the unknown sample to precipitate out the phosphate ions. The precipitate that formed had a mass of 0.125 g. What is the theoretical percentage by mass of phosphate in the unknown sample?

Accepted Answer

13.4%

Answer

6.75%

Answer

15.4%

Answer

30.8%

Question 18

Which of the following substances is a liquid that readily decolourises bromine water under standard conditions?

Accepted Answer

Hex-2-ene

Answer

Ethene

Answer

Cyclohexane

Answer

Benzene

Question 19

The ultraviolet-visible (UV-vis) spectrum below shows how the absorbance varies over a range of wavelengths for a solution containing a particular inorganic compound. Which of the following pairs of intensities should be used to determine the concentration of the inorganic compound in this solution using UV-vis spectroscopy?

Accepted Answer

I(625 nm) and $I_d(625 nm)$

Answer

$I_d(510 nm)$ and $I_d(625 nm)$

Answer

I(510 nm) and $I_d(510 nm)$

Answer

I(510 nm) and $I_d(625 nm)$

Question 20

A section of a polymer containing three monomer units is shown below. When this polymer is formed from its monomer, water is produced as a by-product.
The monomer used to directly produce the polymer above was analysed with nuclear magnetic resonance (NMR) spectroscopy.
Excluding the signal given by the tetramethylsilane (TMS) reference, the monomer would give:

Accepted Answer

3 signals on a $^1H$ NMR spectrum and 3 signals on a
$^{13}C$ NMR spectrum

Answer

1 signal on a $^1H$ NMR spectrum and 3 signals on a
$^{13}C$ NMR spectrum

Answer

3 signals on a $^1H$ NMR spectrum and 4 signals on a
$^{13}C$ NMR spectrum

Answer

4 signals on a $^1H$ NMR spectrum and 4 signals on a
$^{13}C$ NMR spectrum

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