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Lesson 2: Qualitative Analysis of Basic Radicals (Cations) — Picture questions (exam style)

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  • Questions count: 22
  • Passing grade: 60%
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1.
Which pair of cations can be separated from each other using H₂S / HCl (figure)?
Which pair of cations can be separated from each other using H₂S / HCl (figure)?
Ba2+ / Ca2+
Cu2+ / Pb2+
Mg2+ / Cu2+
Cu2+ / Ag+
2.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Ag+, anion I−
cation Zn2+, anion CO₃2−
cation Zn2+, anion NO₂−
cation Fe2+, anion I−
3.
Just enough NaOH(aq) is added to a solution containing 2.5 g of FeSO₄, precipitating Fe(OH)₂ as shown. What mass of precipitate forms?
Just enough NaOH(aq) is added to a solution containing 2.5 g of FeSO₄, precipitating Fe(OH)₂ as shown. What mass of precipitate forms?
1.48 g
2.50 g
4.22 g
2.96 g
4.
NH₃(aq) was added to an unknown salt solution: blue ppt dissolving in excess to a deep-blue solution. Which cation is present?
NH₃(aq) was added to an unknown salt solution: blue ppt dissolving in excess to a deep-blue solution. Which cation is present?
Cu2+
Mg2+
Zn2+
Fe3+
5.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Ca2+, anion SO₄2−
cation NH₄+, anion SO₄2−
cation Ag+, anion Br−
cation NH₄+, anion Cl−
6.
What is observed when confirmatory test is added to a solution of Cu2+ (diagram)?
What is observed when confirmatory test is added to a solution of Cu²⁺ (diagram)?
blood-red with KSCN
white fumes with HCl
black ppt with H₂S
white ppt with H₂S
7.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Ca2+, anion CO₃2−
cation Ca2+, anion Br−
cation Mg2+, anion SO₃2−
cation Fe3+, anion SO₃2−
8.
What is observed when NH₃(aq) is added to a solution of Fe2+ (diagram)?
What is observed when NH₃(aq) is added to a solution of Fe²⁺ (diagram)?
green ppt insoluble in excess
no ppt
red-brown ppt insoluble in excess
brown ppt soluble in excess
9.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Zn2+, anion NO₂−
cation NH₄+, anion PO₄3−
cation Fe3+, anion NO₃−
cation Fe3+, anion NO₂−
10.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Fe3+, anion SO₄2−
cation Zn2+, anion S2−
cation Fe2+, anion SO₄2−
cation Fe3+, anion S2−
11.
Just enough NaOH(aq) is added to a solution containing 4.25 g of FeCl₃, precipitating Fe(OH)₃ as shown. What mass of precipitate forms?
Just enough NaOH(aq) is added to a solution containing 4.25 g of FeCl₃, precipitating Fe(OH)₃ as shown. What mass of precipitate forms?
2.80 g
6.45 g
5.60 g
4.25 g
12.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation NH₄+, anion Cl−
cation Pb2+, anion Cl−
cation Pb2+, anion CO₃2−
cation Cu2+, anion NO₃−
13.
Just enough NaOH(aq) is added to a solution containing 3.5 g of MgCl₂, precipitating Mg(OH)₂ as shown. What mass of precipitate forms?
Just enough NaOH(aq) is added to a solution containing 3.5 g of MgCl₂, precipitating Mg(OH)₂ as shown. What mass of precipitate forms?
5.73 g
4.27 g
2.14 g
3.50 g
14.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Pb2+, anion NO₃−
cation Pb2+, anion S2−
cation Pb2+, anion SO₄2−
cation Al3+, anion NO₃−
15.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Fe2+, anion HCO₃−
cation Zn2+, anion CO₃2−
cation NH₄+, anion CO₃2−
cation Zn2+, anion HCO₃−
16.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Al3+, anion S2−
cation Al3+, anion HCO₃−
cation Zn2+, anion S2−
cation Zn2+, anion HCO₃−
17.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Al3+, anion S2−
cation NH₄+, anion S2−
cation Mg2+, anion S2−
cation NH₄+, anion PO₄3−
18.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Al3+, anion I−
cation Al3+, anion SO₄2−
cation Ag+, anion SO₃2−
cation Al3+, anion SO₃2−
19.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Mg2+, anion SO₄2−
cation Fe3+, anion SO₃2−
cation Zn2+, anion SO₄2−
cation Zn2+, anion SO₃2−
20.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Fe2+, anion CO₃2−
cation Fe2+, anion Br−
cation Fe3+, anion SO₃2−
cation Fe3+, anion Br−
21.
The table gives the results of analysing an unknown salt. Identify it.
The table gives the results of analysing an unknown salt. Identify it.
cation Ag+, anion CO₃2−
cation NH₄+, anion NO₃−
cation Al3+, anion NO₂−
cation NH₄+, anion CO₃2−
22.
Just enough NaOH(aq) is added to a solution containing 9.75 g of ZnSO₄, precipitating Zn(OH)₂ as shown. What mass of precipitate forms?
Just enough NaOH(aq) is added to a solution containing 9.75 g of ZnSO₄, precipitating Zn(OH)₂ as shown. What mass of precipitate forms?
9.75 g
15.9 g
6.00 g
12.0 g
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