11 Qualitative Analysis, Set B To print: Ctrl + P, paper A4, margins Default.
Learners' AlleyDesigned by Khow Willard
11

Qualitative Analysis

Set BExam practice
Name
Time 45 minutes
Total 20 marks

Use a copy of the Periodic Table where you need one.

A

Multiple choice

5 marks
1

Which set of aqueous solutions will form only a colourless solution when mixed together in the same conical flask?

ANaOH, FeCl3, NaCl
BBa(NO3)2, K2SO4, H2SO4
CCuSO4, KCl, H2SO4
DKNO3, NaOH, Na2SO4
Answer [1]

Source: 2020 SJI Year 3 End-of-Year P1 Q21

2

Which statement about the reaction between ammonium carbonate and dilute hydrochloric acid is false?

AAmmonium chloride is produced.
BAmmonia gas is produced.
CThe gas evolved turned damp blue litmus paper red.
DWater is produced.
Answer [1]

Source: 2024 CHIJ Prelim P1 Q13

3

Which reagent could be used to distinguish between dilute sulfuric acid and dilute hydrochloric acid?

Abarium nitrate solution
Bcalcium carbonate
CUniversal Indicator
Dsodium hydroxide solution
Answer [1]

Source: 2024 CHIJ Prelim P1 Q19

4

Aqueous ammonium sulfate is warmed with an excess of aqueous sodium hydroxide. The resulting mixture is neutralised with dilute nitric acid. The mixture is then mixed with aqueous barium nitrate. The precipitate is filtered off and the filtrate is evaporated to leave a white solid. What could the white solid be?

Aammonium nitrate
Bbarium hydroxide
Cbarium sulfate
Dsodium nitrate
Answer [1]

Source: 2024 SJI Prelim P1 Q18

5

A white solid reacted with dilute hydrochloric acid to form a colourless solution and a gas.
Test 1: with aqueous silver nitrate, the colourless solution gave a white precipitate.
Test 2: with aqueous ammonia in excess, the colourless solution gave a colourless solution.
Test 3: the gas formed a white precipitate when bubbled into aqueous calcium hydroxide.
What is the white solid?

Aaluminium carbonate
Baluminium chloride
Czinc carbonate
Dzinc chloride
Answer [1]

Source: 2024 SJI Prelim P1 Q19

B

Structured questions

15 marks
6

A powdered mixture of compound A and metal B is tested. The results are shown in the table.

testobservation
1  The mixture is mixed with excess dilute hydrochloric acid.Gas D, which gives a white precipitate with limewater, is given off. Colourless solution C forms, and metal B is left.
2  The mixture is filtered. A few drops of aqueous sodium hydroxide are added to solution C.White precipitate E forms.
3  Excess aqueous sodium hydroxide is added.The white precipitate is insoluble.
4  Metal B is heated strongly in oxygen to form metal oxide F. F is added to dilute sulfuric acid.Blue solution G forms.
(a)
Identify A, C, D and E.
[4]
(b)
Write an ionic equation, with state symbols, for the formation of precipitate E.
[1]
(c)
A student adds aqueous barium nitrate and aqueous silver nitrate to separate samples of solution C. Describe what would be observed with each.
[2]

Source: 2024 CHS Sec 3 End-of-Year Section B Q8 (adapted)

7

Mixture S contains one cation and two anions. A series of tests was performed on mixture S. The results are shown in the table.

testobservation
1  Dilute hydrochloric acid is added to mixture S.Gas U is given off and solution T forms. Gas U gives a white precipitate in limewater.
2  Aqueous sodium hydroxide is added to solution T.Green precipitate V forms. It turns red-brown on standing.
3  The mixture from test 2 is warmed with a piece of aluminium foil.A gas is given off which turns moist red litmus paper blue.
4  Acidified silver nitrate is added to solution T.White precipitate W forms.
(a)
Identify T, U, V and W.
[4]
(b)
Suggest the identities of the ions present in mixture S.
[1]
(c)
Write a balanced chemical equation for one of the reactions in the tests.
[1]

Source: 2023 PRSS Prelim P2 A3 (adapted)

8

Ammonium-based fertilisers are made from ammonia.

Explain why it is not advisable to add ammonium-based fertilisers to soil which has been limed with calcium hydroxide.
[2]

Source: 2021 SJI Prelim P2 A2(a)(ii)