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Periodic Table and Periodicity question

2021 · 31 Aug · Shift 2 · Q11
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Periodic Table and Periodicity question

2021 · 31 Aug · Shift 2 · Q11

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Match List - I with List - II :

List - I
(Metal Ion)		 List - II
(Group of Qualitative analysis)
(a) Mn2+M{n^{2 + }}Mn2+ (i) Group - III
(b) As3+A{s^{3 + }}As3+ (ii) Group - IIA
(c) Cu2+C{u^{2 + }}Cu2+ (iii) Group - IV
(d) Al3+A{l^{3 + }}Al3+ (iv) Group - IIB


Choose the most appropriate answer from the options given below :
  1. A
    (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  2. B
    (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  3. C
    (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
  4. D
    (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
View written solutionFree

Correct answer: B

  1. Recall the classical qualitative analysis groups

    The relevant cation groups are:

    • Group III: Cations precipitated as hydroxides with NH4OHN{H_4}OHNH4​OH in presence of NH4ClN{H_4}ClNH4​Cl. Examples: Fe3+,Al3+,Cr3+F{e^{3+}}, A{l^{3+}}, C{r^{3+}}Fe3+,Al3+,Cr3+
    • Group IIA: Cations precipitated as sulphides in acidic medium. Example: Cu2+,Cd2+,Pb2+,Bi3+,Hg2+C{u^{2+}}, C{d^{2+}}, P{b^{2+}}, B{i^{3+}}, H{g^{2+}}Cu2+,Cd2+,Pb2+,Bi3+,Hg2+
    • Group IIB: Cations precipitated as sulphides in ammoniacal/basic medium. Example: As3+,Sb3+,Sn2+,Sn4+A{s^{3+}}, S{b^{3+}}, S{n^{2+}}, S{n^{4+}}As3+,Sb3+,Sn2+,Sn4+
    • Group IV: Cations precipitated as sulphides with H2SH_2SH2​S in ammoniacal medium. Example: Mn2+,Zn2+,Ni2+,Co2+M{n^{2+}}, Z{n^{2+}}, N{i^{2+}}, C{o^{2+}}Mn2+,Zn2+,Ni2+,Co2+

  2. Match each ion

    (a) Mn2+M{n^{2+}}Mn2+

    • Mn2+M{n^{2+}}Mn2+ belongs to Group IV.
    • So, (a)→(iii)(a) \to (iii)(a)→(iii)

    (b) As3+A{s^{3+}}As3+

    • Arsenic(III) belongs to Group IIB.
    • So, (b)→(iv)(b) \to (iv)(b)→(iv)

    (c) Cu2+C{u^{2+}}Cu2+

    • Cu2+C{u^{2+}}Cu2+ belongs to Group IIA.
    • So, (c)→(ii)(c) \to (ii)(c)→(ii)

    (d) Al3+A{l^{3+}}Al3+

    • Al3+A{l^{3+}}Al3+ belongs to Group III.
    • So, (d)→(i)(d) \to (i)(d)→(i)

  3. Final matching

    (a)−(iii),(b)−(iv),(c)−(ii),(d)−(i)(a)-(iii),\quad (b)-(iv),\quad (c)-(ii),\quad (d)-(i)(a)−(iii),(b)−(iv),(c)−(ii),(d)−(i)

  4. Compare with options

    This corresponds to Option B.

  5. Comparison with stored correct answer

    • Stored correct answer: B
    • Derived answer: B
    • Therefore, they agree.
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