The incorrect statement regarding the transition metals is:

1. They are malleable and ductile.
2. They have high melting and boiling points.
3. They crystallise with body-centered cubic and hexagonal close-packed structure only.
4. They show variable oxidation states although not always. 

Subtopic:  d-Block Elements- Properties & Uses |
 67%
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Assertion: Transition metals have high boiling points and high enthalpy of atomization.

Reason: The transition metals occur in bcc, hcp or ccp structures charcterstics of metals.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false

  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
Subtopic:  d-Block Elements- Properties & Uses |
 64%
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Assertion: Zn, Cd and Hg are normally not considered transition metals.

Reason: d-orbitals in above elements are completely filled, hence above metals do not show the general charcterstic properties of the transition elements.

  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
Subtopic:  d-Block Elements- Properties & Uses |
 90%
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Assertion :A transition metal forms alloy with other transition metal easily.

Reason: The transition metals have similar electronic configuration,nearly equal radii and exhibit similar packing in their lattices.

  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
Subtopic:  d-Block Elements- Properties & Uses |
 79%
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Assertion : Anhydrous copper(II) chloride is a covalent while anhydrous copper(II)fluoride is ionic in nature.

Reason: In halides of transition metals, the ionic character decreases with increase in atomic mass of the halogen.

  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
Subtopic:  d-Block Elements- Properties & Uses |
 74%
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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
Subtopic:  d-Block Elements- Properties & Uses |
 79%
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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
Subtopic:  d-Block Elements- Properties & Uses |
 89%
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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
Subtopic:  d-Block Elements- Properties & Uses |
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When iron becomes passive by "X", it is due to the formation of "Y". X and Y, respectively, are:

1. Dil. HCl, Fe2O3

2. 80% Conc. HNO3, Fe3O4

3. Conc. H2SO4, Fe3O4

4. Conc. HCl, Fe3O4

Subtopic:  d-Block Elements- Properties & Uses |
 61%
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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 : 

1. Mn2+ acts as auto catalyst.

2. CO2 is formed.

3. Reaction is exothermic.

4. MnO4- catalyses the reaction.

Subtopic:  d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
 65%
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