d- and f- Block Elements — DPP 1

20 NEET questions from d- and f- Block Elements, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Which order is correct for oxidising power?
  1. A $\mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { - 2 } < \mathrm { VO } _ { 2 } ^ { + }$
  2. B $\mathrm { VO } _ { 2 } ^ { + } > \mathrm { MnO } _ { 4 } ^ { - }$
  3. C $\mathrm { VO } _ { 2 } ^ { + } < \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { - 2 }$
  4. D $\mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } ^ { - 2 } > \mathrm { MnO } _ { 4 } ^ { - }$
Show answer & explanation

Correct answer: C

Oxidising power refers to how a compound readily accepts electron.
$\begin{array}{c}\mathrm{VO}_{2^{+}}<\mathrm{Cr}_{2} \mathrm{O}_{7^{-2}} \\ +5 \quad+6\end{array}$
2
Which is correct match
  1. A Brass; $\mathrm { Cu } + \mathrm { Zn }$
  2. B Bronze ; $\mathrm { Cu } + \mathrm { Sn }$
  3. C Stainless steel ; $\mathrm { Cr } + \mathrm { Ni }$
  4. D All of the above
Show answer & explanation

Correct answer: D

Brass – Cu + Zn
Bronze – Cu + Sn
Stainless steel – Cr + Ni
3
Compared to $\mathrm { Cu } ^ { 2 + }$ having $3 \mathrm {~d} ^ { 9 }$ configuration, $\mathrm { Cu } ^ { + }$having 3d ${ } ^ { 10 }$ configuration (aq. solution) :-
  1. A Is more stable
  2. B Is equally stable
  3. C Is less stable
  4. D Stability depends upon nature of copper salt
Show answer & explanation

Correct answer: C

Cu$^{+}$ is less stable than Cu$^{+2}$ in aqueous solution because Cu$^{+2}$ has greater hydration energy.
4
$\mathrm { CrO } _ { 3 }$ is red orange in colour. The nature of oxide is:-
  1. A Acidic
  2. B Basic
  3. C Amphoteric
  4. D Neutral
Show answer & explanation

Correct answer: A

In CrO$_{3}$ Cr is in (+6) oxidation state which is acidic in nature.
5
Which is not a property of intestitial compound ?
  1. A Non stiochiometric
  2. B Harder than pure metal
  3. C Chemically inert
  4. D Having low melting point
Show answer & explanation

Correct answer: D

Interstitial compounds have high melting point.
6
The higher oxidation states of transition elements are found to be the combination with A and B, which are:
  1. A $\mathrm { F } , \mathrm { O }$
  2. B $\mathrm { O } , \mathrm { N }$
  3. C $\mathrm { O } , \mathrm { Cl }$
  4. D $\mathrm { F } , \mathrm { Cl }$
Show answer & explanation

Correct answer: A

Higher oxidation states of transition metals are found with oxygen and fluorine highest fluoride – MnF$_{4}$, highest oxide Mn$_{2}$O$_{7}$
7
Which of the following transition metal do not form amalgam with Hg :-
  1. A Fe
  2. B Co
  3. C Ni
  4. D All of the above
Show answer & explanation

Correct answer: D

These metals do not from amalgam with Hg.
8
Which of the following oxide of chromium is amphoteric in nature
  1. A CrO
  2. B $\mathrm { Cr } _ { 2 } \mathrm { O } _ { 3 }$
  3. C $\mathrm { CrO } _ { 3 }$
  4. D $\mathrm { CrO } _ { 5 }$
Show answer & explanation

Correct answer: B

Chromium (III) oxide is amphoteric in nature.
9
$\left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 }$ (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is :
  1. A $\mathrm { Cr } _ { 2 } \mathrm { O } _ { 3 }$
  2. B $\mathrm { CrO } _ { 2 }$
  3. C $\mathrm { Cr } _ { 2 } \mathrm { O } _ { 4 }$
  4. D $\mathrm { CrO } _ { 3 }$
Show answer & explanation

Correct answer: A

Cr$_{2}$O$_{3}$ is green in colour.
10
Permangnate titrations in presence of Hydrochloric acid are not satisfactory because :-
  1. A HCl is a weak acid
  2. B HCl is a volatile acid
  3. C $\mathrm { KMnO } _ { 4 }$ will oxidise HCl into $\mathrm { Cl } _ { 2 }$
  4. D $\mathrm { KMnO } _ { 4 }$ will show disproportionation in presence of HCl
Show answer & explanation

Correct answer: C

In permagnate titrations KMnO$_{4}$ will oxidise HCl into Cl$_{2}$.
2KMnO$_{4}$ + 16HCl → 2KCl + 2MnCl$_{2}$ + 8H$_{2}$O + 5Cl$_{2}$
11
Which of the following does not give chromyl chloride test ?
  1. A NaCl
  2. B KCl
  3. C $\mathrm { NH } _ { 4 } \mathrm { Cl }$
  4. D $\mathrm { HgCl } _ { 2 }$
Show answer & explanation

Correct answer: D

HgCl$_{2}$ does not give chromyl chloride test due to its covalent character.
12
Which compound is used in manufacturing of $\mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 }$ ?
  1. A $\mathrm { Na } _ { 2 } \mathrm { CrO } _ { 4 }$
  2. B $\mathrm { CrO } _ { 5 }$
  3. C $\mathrm { FeCr } _ { 2 } \mathrm { O } _ { 4 }$
  4. D $\mathrm { CrO } _ { 3 }$
Show answer & explanation

Correct answer: C

K$_{2}$Cr$_{2}$O$_{7}$ is prepared from chromite ore (FeCr$_{2}$O$_{4}$)
13
Which pair of ions is colourless :
  1. A $\mathrm { Mn } ^ { 3 + } , \mathrm { Co } ^ { 3 + }$
  2. B $\mathrm { Fe } ^ { 3 + } , \mathrm { Cr } ^ { 3 + }$
  3. C $\mathrm { Zn } ^ { 2 + } , \mathrm { Sc } ^ { 3 + }$
  4. D $\mathrm { Ti } ^ { 2 + } , \mathrm { Cu } ^ { 2 + }$
Show answer & explanation

Correct answer: C

Zn$^{+2}$, Sc$^{+3}$ are diamagnetic and colourless.
14
$\mathrm { KMnO } _ { 4 }$ on treatment with conc. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ forms a compound $( \mathrm { X } )$ which decomposes explosively on heating forming (Y). The (X) and $( \mathrm { Y } )$ are respectively
  1. A $\mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 } , \mathrm { MnO } _ { 2 }$
  2. B $\mathrm { Mn } _ { 2 } \mathrm { O } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 3 }$
  3. C $\mathrm { MnSO } _ { 4 } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 3 }$
  4. D $\mathrm { Mn } _ { 2 } \mathrm { O } _ { 3 } , \mathrm { MnO } _ { 2 }$
Show answer & explanation

Correct answer: A

KMnO₄ on treatment with conc. H₂SO₄ forms a compound which is –
KMnO₄ + H₂SO₄ → H₂O + K₂SO₄ + Mn$_{2}$O$_{7}$ (x)
x on heating gives following –
$\underset{(\mathrm{x})}{\mathrm{Mn}_{2} \mathrm{O}_{7}} \xrightarrow{\text { heat }} \underset{(\mathrm{y})}{\mathrm{MnO}_{2}}$
15
Which halide of copper does not exist?
  1. A $\mathrm { CuF } _ { 2 }$
  2. B $\mathrm { CuCl } _ { 2 }$
  3. C $\mathrm { Cu } _ { 2 } \mathrm { I } _ { 2 }$
  4. D $\mathrm { CuI } _ { 2 }$
Show answer & explanation

Correct answer: D

Iodine ions are strong reducing agents therefore Cu (II) iodide reduces to copper (I) iodide.
16
Maximum spin magnetic moment is shown by:
  1. A $\mathrm { d } ^ { 5 }$
  2. B $\mathrm { d } ^ { 6 }$
  3. C $\mathrm { d } ^ { 7 }$
  4. D $\mathrm { d } ^ { 8 }$
Show answer & explanation

Correct answer: A

d$^{5}$ configuration will have maximum spin magnetic moment.
17
Which of the following configurations of 3d series exhibits the largest number of oxidation states -
  1. A $[ \mathrm { Ar } ] 3 \mathrm {d} ^ { 8 } 4 \mathrm {s} ^ { 2 }$
  2. B $[ \mathrm { Ar } ] 3 \mathrm {d} ^ { 10 } 4 \mathrm {s} ^ { 1 }$
  3. C $[ \mathrm { Ar } ] 3 \mathrm {d} ^ { 5 } 4 \mathrm {s} ^ { 2 }$
  4. D $[ \mathrm { Ar } ] 3 \mathrm {d} ^ { 7 } 4 \mathrm {s} ^ { 2 }$
Show answer & explanation

Correct answer: C

Mn shows maximum oxidation states from +2 to + 7.
18
Highest fluoride and oxide of Mn are respectively:-
  1. A $\mathrm { MnF } _ { 7 } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$
  2. B $\mathrm { MnF } _ { 5 } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$
  3. C $\mathrm { MnF } _ { 4 } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$
  4. D $\mathrm { MnF } _ { 6 } , \mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$
Show answer & explanation

Correct answer: C

MnF$_{4}$ (maximum fluoride)
Mn$_{2}$O$_{7}$ (maximum oxide)
19
The product of oxidation of $\mathrm { I } ^ { - }$with $\mathrm { MnO } _ { 4 } ^ { - }$ in weak alkaline medium is :
  1. A $\mathrm { IO } _ { 3 } ^ { - }$
  2. B $\mathrm { I } _ { 2 }$
  3. C $\mathrm { IO } ^ { - }$
  4. D $\mathrm { IO } _ { 4 } ^ { - }$
Show answer & explanation

Correct answer: A

Oxidation of I¯ with KMnO$_{4}$ is given by –
MnO$_{4}$¯ + I¯ ⎯→ IO$_{3}$¯ + Mn$^{+2}$
20
Which of the following pair of ions has same value of "spin-only" magnetic moment
  1. A $\mathrm { Cu } ^ { + } , \mathrm { Cu } ^ { 2 + }$
  2. B $\mathrm { Co } ^ { 3 + } , \mathrm { Fe } ^ { 2 + }$
  3. C $\mathrm { Ti } ^ { 2 + } , \mathrm { V } ^ { 2 + }$
  4. D $\mathrm { Sc } ^ { 2 + } , \mathrm { Zn } ^ { + 2 }$
Show answer & explanation

Correct answer: B

Co$^{+3}$ – [Ar] 4s$^{0}$ 3d$^{6}$
Fe$^{+2}$ – [Ar] 4s$^{0}$ 3d$^{6}$
They will have same value of spin only magnetic moment.

Attempt this as a timed test

Reading answers is not the same as sitting the paper. Attempt it timed and you get your score, per-question timing, and the mistakes tracked for revision.

Start free

More d- and f- Block Elements tests

d- and f- Block Elements — DPP 2 20 Q d- and f- Block Elements — DPP 3 20 Q
All d- and f- Block Elements tests →