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Assertion: Eo for Mn3+/Mn2+ couple is more positive than for Fe3+/Fe2+.

Reason: Mn3+ has d4 configuration and Fe3+ has a d5 configuration.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion: Transition metals exhibit higher enthalpies of atomization.

Reason: The atoms of transition metals are held together by strong metallic bonds.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion : The transition elements form interstitial compounds.

Reason: Steel and cast iron are hard due to the formation of an interstitial compound with carbon.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Iron becomes passive by "X", it is due to the formation of "Y". X, and Y respectively are: 

3. Conc. H2SO4, Fe3O4

  • Dil. HCl, Fe2O3

  • 80% Conc. HNO3, Fe3O4

  • 4. Conc. HCl, Fe3O4

  • 4

When KMnO4 solution is added to hot oxalic acid solution, the decolorization is slow in the beginning but becomes instantaneous after some time. This is because : 

  • Mn2+ acts as auto catalyst.

  • CO2 is formed.

  • Reaction is exothermic.

  • MnO-4 catalyses the reaction.

 The incorrect statement among the following is:

  • MnO2 dissolves in conc. HCl, but does not form Mn4+ ions.

  • MnO2 oxidizes hot concentrated H2SO4 liberating oxygen.

  • K2MnO4 is formed when MnO2 infused KOH is oxidized by air, KNO3, PbO2 or NaBiO3

  • The decomposition of acidic KMnO4 is not catalyzed by sunlight.

The addition of non-metals like B, and C to the interstitial sites of a transition metal increases-

  • Ductility.

  • Melting Point.

  • Shining.

  • Conductivity.

The metal that does not form amalgam is-

  • Fe

  • Au

  • Zn

  • Ag

The element of the first transition series having lowest oxidation potential value (M→M2++2e-) is -

  • Mn

  • Fe

  • Ni

  • Cu

The incorrect statement among the following about the chemistry of 3d and 4f series elements is -

  • 3d elements show more oxidation states than 4f series elements.

  • The energy difference between 3d and 4s orbitals is very little.

  • Europium (ll) is more stable than Ce (ll).

  • The paramagnetic character in 3d series elements increases from scandium to copper.

An element among the following that have strongest metallic bond is -

  • Fe

  • Sc

  • V

  • Cr

Ionization potential values of d-block elements as compared to ionization potential value of f-block elements are :

  • Higher

  • Equal

  • Lower

  • Can't compae.

The incorrect statement among the following regarding Cerium is -

  • The +4 oxidation state of cerium is not known in solutions.

  • The +3 oxidation state of cerium is more stable than the +4 oxidation state.

  • The common oxidation states of cerium are +3, and +4.

  • Cerium (IV) acts as an oxidizing agent.

Native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of :

  • Nitrogen

  • Oxygen

  • Carbon dioxide

  • Argon

A compound that cannot decolourise KMnO4 solution is -

  •  CO-23

  •  NO-2

  •  S-2

  •  Cl-

Zinc can be coated on iron to produce galvanised iron but the reverse is not possible because: 

  • Zinc is lighter than iron.

  • Zinc has a lower melting point than iron.

  • Zinc has lower negative reduction potential than iron.

  • Zinc has a higher negative reduction potential than iron.

The reason for greater range of oxidation states in actinoids is attributed to:

  • Actinoid Contraction

  • 5f, 6d and 7s levels having comparable energies.

  • 4f and 5d levels being close in energies.

  • The radioactive nature of actinoids

An ion among the following that exhibits d–d transition, and paramagnetism is  -
  • CrO2-4
  • Cr2O2-7
  •  MnO-4
  •  MnO2-4

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code : 

Column I            Column II 
a. Co3+              i. √8 B.M.
b. Cr3+              ii. √35 B.M.
c. Fe3+              iii. √15 B.M. 
d. Ni2+              iv. √24 B.M.
  •  a-iv; b-iii; c-ii; d-i

  •  a-i; b-ii; c-iii; d-iv

  •  a-iv; b-i; c-ii; d-iii

  •  a-iii; b-iv; c-i; d-ii

When copper is heated with conc. HNO3 it produces : 

  • Cu(NO3) and NO

  • Cu(NO3)2, NO and NO2

  • Cu(NO3)2 and N2O

  • Cu(NO3)2 and NO2

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are : 
1. [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
 
 
 

 
  • 4. [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2
  • 2. [Xe] 4f6&nsp;5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
  • 3. [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
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Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

  •  [Xe]4 f8 6d2

  •  [Xe]4 f9 5s1

  •  [Xe]4 f7 5d16s2

  •  [Xe]4 f6 5d26s2

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).
  • Ti (22) and Zr (40)
  • Zr (40) and Nb (41)
  • Zr (40) and Hf (72)
  • Zr (40) and Ta (73)

Which of the following processes does not involve oxidation of iron?

 
  • Rusting of iron sheets
  • Decolourisation of blue CuSO4 solution by iron
  • Formation of Fe(CO)5 from Fe
  • Liberation of H2 from steam by iron a high temperature

The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of :

The pair of compounds that can exist together is:

In acidic medium, H2O2 changes Cr2O7–2 to CrO5 which has two (–O – O–) bonds Oxidation state of Cr in CrO5 is :
Identify the correct order of solubility in aqueous medium :

 
KMnO4 can be prepared from K2MnO4 as per the reaction: 
3MnO2-4+2H2O⇌2MnO-4+MnO2+4OH-
The reaction can go to completion by removing OH– ions by adding:

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. No Cr= 24, Mn= 25, Fe=26, Co= 27)
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