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d- and f-Block Elements · Question 38

NEET 2013MCQMedium📈 Topic in 38% papers+4−1
1

KMnO4 can be prepared from K2MnO4 as per the reaction, 3MnO42- + 2H2O 2MnO4- + MnO2 + 4OH- The reaction can go to completion by removing OH- ions by adding

  1. CO2
  2. SO2
  3. HCl
  4. KOH

Answer

(1) CO2

Solution

CO2 (an acidic oxide) removes OH- ions:

CO2 + 2OH- CO32- + H2O

⇒ the equilibrium shifts forward (Le Chatelier's principle) and the disproportionation of manganate goes to completion.

SO2 is a reducing agent and would reduce MnO4-; HCl is oxidised by MnO4- to Cl2; KOH adds OH- and shifts the equilibrium backward.

Answer: (1)

NEET 2013

Keep practising — d- and f-Block Elements

2

Which of the following does not give oxygen on heating?

  1. K2Cr2O7
  2. (NH4)2Cr2O7
  3. KClO3
  4. Zn(ClO3)2
NEET 2013
3

Which of the following statements about the interstitial compounds is incorrect?

  1. They are much harder than the pure metal.
  2. They have higher melting points than the pure metal.
  3. They retain metallic conductivity.
  4. They are chemically reactive.
NEET 2013
4

Which of the following lanthanoid ions is diamagnetic? (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

  1. Eu2+
  2. Yb2+
  3. Ce2+
  4. Sm2+
NEET 2013
5

The outer electronic configuration of Gd (At. No. 64) is

  1. 4f5 5d4 6s1
  2. 4f7 5d1 6s2
  3. 4f3 5d5 6s2
  4. 4f4 5d5 6s1
NEET 2013 (Karnataka)
6

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because

  1. both Sc3+ and Zn2+ ions are colourless and form white compounds.
  2. in case of Sc, 3d orbitals are partially filled but in Zn these are filled.
  3. last electron is assumed to be added to 4s level in case of Zn.
  4. both Sc and Zn do not exhibit variable oxidation states.
NEET 2013 (Karnataka)
7

The catalytic activity of transition metals and their compounds is ascribed mainly to

  1. their magnetic behaviour
  2. their unfilled d-orbitals
  3. their ability to adopt variable oxidation states
  4. their chemical reactivity
AIPMT 2012 (Mains)
8

Which of the following exhibits only + 3 oxidation state?

  1. U
  2. Th
  3. Ac
  4. Pa
AIPMT 2012 (Mains)
9

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
AIPMT 2012 (Mains)
10

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)
11

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

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

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