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d- and f-Block Elements

AIPMT 2012 (Prelims)MCQMediumNot asked in last 5 yrs+4−1
Ques. 1AIPMT 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.

Answer

(2) Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis.

Solution

As per NCERT, sodium dichromate is more soluble (and hygroscopic), so potassium dichromate is used as a primary standard in volumetric analysis.

statement (2) is not true.

(1) True: Cr2O72- + 8H+ + 3H2S 2Cr3+ + 3S + 7H2O; colloidal sulphur gives a milky colour.

(3) and (4) True: Cr2O72- (orange) CrO42- (yellow) depending on pH; on raising the pH, Cr2O72- + 2OH- 2CrO42- + H2O.

Answer: (2)

Keep practising — d- and f-Block Elements

Ques. 2AIPMT 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. 3AIPMT 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. 4AIPMT 2010 (Mains)

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

  1. 4
  2. 2
  3. 5
  4. 3
Ques. 5AIPMT 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. 6AIPMT 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. 7AIPMT 2010 (Prelims)

Which of the following pairs has the same size?

  1. Fe2+, Ni2+
  2. Zr4+, Ti4+
  3. Zr4+, Hf4+
  4. Zn2+, Hf4+
Ques. 8AIPMT 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. 9AIPMT 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-
Ques. 10AIPMT 2008

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is

  1. Mn > Cr > Ti > V
  2. Ti > V > Cr > Mn
  3. Cr > Mn > V > Ti
  4. V > Mn > Cr > Ti
Ques. 11AIPMT 2007

Which one of the following ions is the most stable in aqueous solution? (At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

  1. V3+
  2. Ti3+
  3. Mn3+
  4. Cr3+

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