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d- and f-Block Elements

AIPMT 2012 (Mains)MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2012 (Mains)

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)

Answer

(3) Cu (Z = 29)

Solution

As per NCERT, E M2+/M values (V): Fe −0.44, Co −0.28, Ni −0.25, Cu +0.34.

Copper alone has a positive value because its high enthalpy of atomisation and high ionisation enthalpies (to form Cu2+) are not balanced by its hydration enthalpy.

∴ Cu does not liberate H2 from acids.

Answer: (3)

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Ques. 2AIPMT 2012 (Prelims)

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

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

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.
Ques. 4AIPMT 2011 (Prelims)

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
Ques. 5AIPMT 2011 (Prelims)

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
Ques. 6AIPMT 2010 (Mains)

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

  1. 4
  2. 2
  3. 5
  4. 3
Ques. 7AIPMT 2010 (Prelims)

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)
Ques. 8AIPMT 2010 (Prelims)

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+
Ques. 9AIPMT 2010 (Prelims)

Which of the following pairs has the same size?

  1. Fe2+, Ni2+
  2. Zr4+, Ti4+
  3. Zr4+, Hf4+
  4. Zn2+, Hf4+
Ques. 10AIPMT 2009

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
Ques. 11AIPMT 2009

Out of TiF62-, CoF63-, Cu2Cl2 and NiCl42- (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are

  1. Cu2Cl2 and NiCl42-
  2. TiF62- and Cu2Cl2
  3. CoF63- and NiCl42-
  4. TiF62- and CoF63-

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