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NEET UG d- and f-Block Elements — practice questions — page 2

Explore 94 free d- and f-Block Elements questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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d- and f-Block Elements questions and exercises with answers

Showing questions 31–60 of 94.

Why is the third IE of Fe lower than that of Mn?Read the answer and worked solution →Why does first ionisation enthalpy rise only slightly across the 3d series?Read the answer and worked solution →What is the lowest common oxidation state of the 3d transition metals?Read the answer and worked solution →Manganese shows every oxidation state within which range?Read the answer and worked solution →Which 3d element does not show variable oxidation states?Read the answer and worked solution →Which oxidation state of titanium is the most stable?Read the answer and worked solution →Going down group 6 from Cr to W, how does the stability of the +6 state change?Read the answer and worked solution →Low oxidation states such as zero are stabilised by ligands with what property?Read the answer and worked solution →Copper does not liberate hydrogen from dilute HCl. Which property explains this?Read the answer and worked solution →Which acid can dissolve copper metal?Read the answer and worked solution →Why is E(Ni2+/Ni) more negative than expected?Read the answer and worked solution →Which pair of 3d M3+ ions are the strongest oxidising agents in water?Read the answer and worked solution →Both Cr2+ and Mn3+ are d4, yet Cr2+ is reducing. What makes Cr2+ reducing?Read the answer and worked solution →Why is the E value for Mn3+/Mn2+ much more positive than for Cr3+/Cr2+?Read the answer and worked solution →Which copper(II) halide is unknown because Cu2+ oxidises the anion?Read the answer and worked solution →Why is Cu2+(aq) more stable than Cu+(aq)?Read the answer and worked solution →Manganese's highest oxide is Mn2O7 but its highest fluoride is MnF4. Why does oxygen do better?Read the answer and worked solution →Which oxide of manganese is a covalent green oil?Read the answer and worked solution →As the oxidation number of a transition metal in its oxide rises, what happens to ionic character?Read the answer and worked solution →What is the acid-base nature of V2O5?Read the answer and worked solution →Paramagnetism in transition metal ions arises from what?Read the answer and worked solution →What is the magnetic moment of a single unpaired electron?Read the answer and worked solution →A chemist measures the spin-only moment of Mn2+ (3d5). What value is expected?Read the answer and worked solution →An aqueous 3d ion shows a spin-only moment of 3.87 BM. Which ion could it be?Read the answer and worked solution →Why does the spin-only formula work for 3d ions?Read the answer and worked solution →The colour seen for a transition metal ion corresponds to what?Read the answer and worked solution →In transition metal ions, colour comes from which electronic change?Read the answer and worked solution →Why do transition metals form so many complexes?Read the answer and worked solution →Transition metal catalysis is mainly linked to what?Read the answer and worked solution →Which catalyst is used in the Contact process for sulphuric acid?Read the answer and worked solution →

Worked practice questions

Why is the third IE of Fe lower than that of Mn?

  1. Fe3+ has a d6 configuration
  2. Fe2+ to Fe3+ gives stable d5
  3. Iron has lower nuclear charge
  4. Mn2+ to Mn3+ gives stable d5
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Correct answer: B. Fe2+ to Fe3+ gives stable d5

Removing an electron from d6 Fe2+ produces the stable half-filled d5 ion, while Mn2+ would have to lose its stable d5 arrangement.

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Why does first ionisation enthalpy rise only slightly across the 3d series?

  1. Nuclear charge stays constant
  2. 4s electrons shield 3d electrons
  3. 3d electrons shield 4s electrons
  4. Atomic radii rise steadily
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Correct answer: C. 3d electrons shield 4s electrons

Added 3d electrons screen the outer 4s electrons from the growing nuclear charge, so radii and ionisation enthalpies change little.

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What is the lowest common oxidation state of the 3d transition metals?

  1. +3
  2. 0
  3. +2
  4. +1
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Correct answer: C. +2

Losing the two 4s electrons gives +2, the lowest oxidation state common to these metals.

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