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d-and f-Block Elements Chemistry - d-and f-Block Elements

Bihar Board (BSEB) - STD 12 Science - Chemistry (BSEB - English Medium). 73 questions in this chapter.

Question types

d-and f-Block Elements question types

73 questions across 5 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

73
Questions
5
Question groups
5
Question types
Sample Questions

d-and f-Block Elements questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M.C.Q [1M]1 Mark
Which of the following has maximum number of unpaired electrons?
  • A
    $ Mg^{2+} $
  • B
    $ Ti^{3+} $
  • C
    $ V^{3+} $
  • ✓
    $ Fe^{3+} $

Answer: D.

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Q 101 Marks Question1 Mark
Give reason and select one atom/ion which will exhibit asked property :
(i) $Sc ^{3+}{\text { or } Cr ^{3+}}^{3+}$ (Exhibit diamagnetic behaviour)
(ii) Cr or Cu (High melting and boiling point)
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Q 163 Marks Question3 Marks
Write down the electronic configuration of :
(a) $Cr ^{3+}$$\quad$(b) $Cu ^{+}$$\quad$(c) $Co ^{2+}$$\quad$(d) $M n ^{ 2 + }$
(e) $P m ^{ 3 + }$$\quad$(f) $Ce ^{ 4 +}$$\quad$(g) $Lu ^{2+}$$\quad$(h) $Th ^{4+}$.
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Q 173 Marks Question3 Marks
(a) Account for the following :
(i) Copper (I) compounds are white whereas Copper (II) compounds are coloured.
(ii) Chromates change their colour when kept in an acidic solution.
(iii) $Zn , Cd , Hg$ are considered as $d$-block elements but not as transition elements.
(b) Calculate the spin only moment of $Co ^{2+}( Z =27)$ by writing the electronic configuration of Co and $Co ^{2+}$.
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Q 183 Marks Question3 Marks
Give the reasons for following:
(i) $E ^{\circ}$ value for $\left( mn ^{+2} / mn \right)$ is negative whoreas for $\left( cn ^{2+} / cu \right)$ is positive.
(ii) Actinoids show irregularities in their electronic configuration.
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Q 193 Marks Question3 Marks
Complete the following equations :
(a) (i) $2 MnO _2+4 KOH + O _2 \xrightarrow{\Delta}$
(ii) $Cr _2 O _7^{2-}+14 K^{+}+6 I ^{-} \longrightarrow$
(b) The elements of 3rd transition series are given as :
Sc Ti V Cr Mn Fe Co Ni Cu Zn
(i) Write the element which is not regarded as a transition element. Give reason.
(ii) Which element has the highest melting point.
(iii) Write the element which can show an oxidation state of +1 .
(iv) Which element is a strong oxidizing agent in +3 oxidation state and why?
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Q 203 Marks Question3 Marks
Write balanced chemical equations for the following reactions:
(i) A mixture of potassium dichromate and sodium chloride is heated with concentrated $ H_{2}SO_{4} $.
(ii) Potassium permanganate is added to a hot solution of manganous sulphate.
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