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d- and f-Block Elements · Question 49

AIPMT 2012 (Prelims)MCQMedium📈 Topic in 0% papers+4−1
1

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)

AIPMT 2012 (Prelims)

Keep practising — d- and f-Block Elements

2

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)
3

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)
4

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

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

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)
6

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)
7

Which of the following pairs has the same size?

  1. Fe2+, Ni2+
  2. Zr4+, Ti4+
  3. Zr4+, Hf4+
  4. Zn2+, Hf4+
AIPMT 2010 (Prelims)
8

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
9

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-
AIPMT 2009
10

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
AIPMT 2008
11

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+
AIPMT 2007

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