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d- and f-Block Elements · Question 46

AIPMT 2012 (Mains)MCQMedium📈 Topic in 12% papers+4−1
1

Which one of the following does not correctly represent the correct order of the property indicated against it?

  1. Ti < V < Cr < Mn : increasing number of oxidation states
  2. Ti3+ < V3+ < Cr3+ < Mn3+ : increasing magnetic moment
  3. Ti < V < Cr < Mn : increasing melting points
  4. Ti < V < Mn < Cr : increasing 2nd ionization enthalpy

Answer

(3) Ti < V < Cr < Mn : increasing melting points

Solution

(1) Oxidation states: Ti (+2 to +4), V (+2 to +5), Cr (+2 to +6), Mn (+2 to +7) ⇒ number increases ⇒ correct.

(2) Ti3+ (3d1), V3+ (3d2), Cr3+ (3d3), Mn3+ (3d4): unpaired electrons 1 < 2 < 3 < 4 ⇒ magnetic moment increases ⇒ correct.

(3) As per NCERT, melting points rise to a maximum near the middle of the series; Mn has an anomalously low melting point (Ti 1668 °C, V 1910 °C, Cr 1907 °C, Mn 1246 °C) ⇒ the order Ti < V < Cr < Mn is not correct.

(4) 2nd ionization enthalpy (kJ mol-1): Ti 1310, V 1414, Mn 1509, Cr 1592 (Cr+ is stable 3d5) ⇒ correct.

Answer: (3)

AIPMT 2012 (Mains)

Keep practising — d- and f-Block Elements

2

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential ( E M2+/M ) value has a positive sign?

  1. Co (Z = 27)
  2. Ni (Z = 28)
  3. Cu (Z = 29)
  4. Fe (Z = 26)
AIPMT 2012 (Mains)
3

Identify the alloy containing a non-metal as a constituent in it.

  1. Invar
  2. Steel
  3. Bell metal
  4. Bronze
AIPMT 2012 (Prelims)
4

Which of the statements is not true?

  1. On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed.
  2. Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.
  3. K2Cr2O7 solution in acidic medium is orange.
  4. K2Cr2O7 solution becomes yellow on increasing the pH beyond 7.
AIPMT 2012 (Prelims)
5

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

  1. Mn > Fe > Cr > Co
  2. Fe > Mn > Co > Cr
  3. Co > Mn > Fe > Cr
  4. Cr > Mn > Co > Fe
AIPMT 2011 (Prelims)
6

Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of

  1. Cr2(SO4)3
  2. CrO42-
  3. Cr2(SO3)3
  4. CrSO4
AIPMT 2011 (Prelims)
7

Which of the following oxidation states is the most common among the lanthanoids?

  1. 4
  2. 2
  3. 5
  4. 3
AIPMT 2010 (Mains)
8

Which of the following ions will exhibit colour in aqueous solutions?

  1. La3+ (Z = 57)
  2. Ti3+ (Z = 22)
  3. Lu3+ (Z = 71)
  4. Sc3+ (Z = 21)
AIPMT 2010 (Prelims)
9

Which of the following ions has electronic configuration [Ar]3d6? (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

  1. Ni3+
  2. Mn3+
  3. Fe3+
  4. Co3+
AIPMT 2010 (Prelims)
10

Which of the following pairs has the same size?

  1. Fe2+, Ni2+
  2. Zr4+, Ti4+
  3. Zr4+, Hf4+
  4. Zn2+, Hf4+
AIPMT 2010 (Prelims)
11

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

  1. 3d54s1
  2. 3d54s2
  3. 3d24s2
  4. 3d34s2
AIPMT 2009

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