The oxidation number is changed in which of the following case

1. SO2 gas is passed into Cr2O72-/H+

2. Aqueous solution of CrO42- is acidified

3. CrO2Cl2 is dissolved in NaOH

4. Cr2O72- solution is made alkaline

Subtopic:  Chemistry of Mn and Cr Compounds |
 56%
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Which of the following elements form stable dinuclear ions

1. Zn

2. Cd

3. Hg

4. Fe

Subtopic:  d-Block Elements- Properties & Uses |
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The correct electronic configuration of Ti(Z=22 atom) is

(1) 1s22s22p63s23p63d2

(2) 1s22s22p63s23p63d24p6

(3) 1s22s22p63s23p63d4

(4) 1s22s22p63s23p64s23d2

Subtopic:  d-Block Elements- Properties & Uses |
 86%
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The correct statement regarding colour of Zn2+, Ni2+and Cr3+among the following is:

1. Only Zn2+ is Colourless and  Ni2+and Cr3+ are coloured
2. All these are colourless
3. All these are coloured
4. Only Ni2+ is coloured and Zn2+ and Cr3+ are colourless.
Subtopic:  d-Block Elements- Properties & Uses |
 85%
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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 |
 63%
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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 |
 89%
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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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