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Chemistry M.C.Q (1 Marks)

The d- and f-Block Elements · CBSE STD 12 Science (CBSE - English Medium). 41 questions.

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M.C.Q (1 Marks)

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41 questions · timed · auto-graded

MCQ 11 Mark
The chemical formla of chromite ore is :
  • A
    $MnO _2$
  • B
    $Na _2 Cr _2 O _4$
  • ✓
    $FeCr _2 O _4$
  • D
    $Na _2 CrO _4$
Answer
Correct option: C.
$FeCr _2 O _4$
c
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MCQ 31 Mark
Which of the following metals of 3 d series has the lowest melting point?
  • A
    Fe
  • B
    Mn
  • ✓
    Zn
  • D
    Cu
Answer
Correct option: C.
Zn
c
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MCQ 51 Mark
The pair of metals that can be purified by Von-Arkel method :
  • A
    $Na , Al$
  • B
    $Ga , Zn$
  • C
    $Ni , Si$
  • ✓
    $Zr , Ti$
Answer
Correct option: D.
$Zr , Ti$
d
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MCQ 61 Mark
Aqueous solution of $K _2 Cr _2 O _7$ reacts with $H _2 S$ under acidic conditions to give green product (A). (A) is :
  • ✓
    $Cr _2\left( SO _4\right)_3$
  • B
    $CrSO _4$
  • C
    $K _2 CrO _4$
  • D
    $CrO _3$
Answer
Correct option: A.
$Cr _2\left( SO _4\right)_3$
a
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MCQ 71 Mark
Which of the following compounds is not coloured?
  • A
    $TiCl _3$
  • ✓
    $TiCl _4$
  • C
    $K _2 Cr _2 O _7$
  • D
    $KMnO _4$
Answer
Correct option: B.
$TiCl _4$
b
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MCQ 81 Mark
The correct order of decreasing values of second ionizatin enthalpy of $Ti (22), V (23), Cr (24)$ and $Mn (25)$ is :
  • ✓
    $Cr > Mn > V > Ti$
  • B
    $V > Mn > Cr > Ti$
  • C
    $Mn > Cr > Ti > V$
  • D
    $Ti > V > Cr > Mn$
Answer
Correct option: A.
$Cr > Mn > V > Ti$
a
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MCQ 91 Mark
The effective magnetic moment of $Ti ^{3+}$ ion is :
  • ✓
    1.73 BM
  • B
    270 BM
  • C
    5.92 BM
  • D
    2.83 BM
Answer
Correct option: A.
1.73 BM
a
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MCQ 101 Mark
Which atom exhibits the highest oxidation number among the following atoms with outermost electronic configuration?
  • A
    $(n-1) d^8 n s^2$
  • B
    $(n-1) d^{\tilde{n}} n s^1$
  • C
    $(n-1) d^3 n s^2$
  • ✓
    $(n-1) d^8 n s^2$
Answer
Correct option: D.
$(n-1) d^8 n s^2$
d
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MCQ 111 Mark
$E _{ M ^{3+}}^0 M ^{2+}$ values for $Cr , Mn , Fe$ and Co are -0.41 , $+1.57,0.77$ and +1.97 respectively. Which of these metals will the oxidation state easily change from +2 to +3 ?
  • ✓
    Cr
  • B
    Mn
  • C
    Fe
  • D
    Co
Answer
Correct option: A.
Cr
a
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MCQ 121 Mark
The pair of colourless ions is :
  • ✓
    $Cu ^{+}, Zn ^{2+}$
  • B
    $Cu ^{2+}, Zn ^{2+}$
  • C
    $V ^{3+}, Cr ^{3+}$
  • D
    $Mn ^{3+}, Fe ^{3+}$
Answer
Correct option: A.
$Cu ^{+}, Zn ^{2+}$
a
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MCQ 131 Mark
The group of ferromagnetic metals is :
  • A
    $Cu , Ag , Au$
  • B
    $Cr , Mo , W$
  • ✓
    $Fe , CO , Ni$
  • D
    none of these
Answer
Correct option: C.
$Fe , CO , Ni$
c
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MCQ 141 Mark
What will be the equivalent weight of $K _2 Cr _2 O _7$ is molecular weight $= M$ ?
  • A
    M
  • B
    $\frac{ M }{3}$
  • ✓
    $\frac{ M }{6}$
  • D
    $\frac{ M }{2}$
Answer
Correct option: C.
$\frac{ M }{6}$
c
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MCQ 151 Mark
Which of the following is acidic oxide?
  • A
    MnO
  • B
    $Mn _2 O _3$
  • C
    $MnO _2$
  • ✓
    $Mn _2 O _7$
Answer
Correct option: D.
$Mn _2 O _7$
d
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MCQ 161 Mark
Which of the following elements has the highest third ionization enthalpy?
  • ✓
    Mn
  • B
    Cr
  • C
    Fe
  • D
    V
Answer
Correct option: A.
Mn
a
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MCQ 171 Mark
How many electrons does potassium permanganate accept in alkaline medium?
  • A
    5
  • B
    4
  • ✓
    3
  • D
    2
Answer
Correct option: C.
3
c
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MCQ 181 Mark
The product obtained when acidic potassium permanganate solution is reacted with oxalate ion is :
  • A
    $CO _3{ }^{2-}$
  • ✓
    $CO _2$
  • C
    $KHCO _3$
  • D
    0
Answer
Correct option: B.
$CO _2$
b
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MCQ 191 Mark
$Cr _2 O _7{ }^{2-}$ forms in alkaline medium :
  • A
    $CrO _3$
  • ✓
    $CrO _4{ }^{2-}$
  • C
    $CrO _2$
  • D
    all of these
Answer
Correct option: B.
$CrO _4{ }^{2-}$
b
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MCQ 201 Mark
Which metal has the highest melting point in the first transition series?
  • A
    Mn
  • ✓
    Cr
  • C
    Fe
  • D
    Cu
Answer
Correct option: B.
Cr
b
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MCQ 211 Mark
Which statement is not true for the elements of f block?
  • A
    These are called internal transition elements.
  • ✓
    All these elements are radioactive.
  • C
    In these, electrons are generally filled in $4 f$ and $5 f$.
  • D
    Actinoids have more variable oxidation states as compared to lanthanoids.
Answer
Correct option: B.
All these elements are radioactive.
b
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MCQ 221 Mark
The reason for stability of $Ce ^{4+}$ is :
  • A
    $4 f^7$ configuration
  • ✓
    $4 f^{10}$ configuration
  • C
    $4 f^{14}$
  • D
    $4 f^7 6 s^2$
Answer
Correct option: B.
$4 f^{10}$ configuration
b
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MCQ 231 Mark
If the radius of $La ^{3+}$ (atomic number $=57$ ) is $1.06 \mathring A$, then the value (approximately) of the radius of $Lu ^{3+}$ (atomic number $=71$ ) will be :
  • A
    $1.40 \mathring A$
  • B
    $1.06 \mathring A$
  • ✓
    $0.85 \mathring A$
  • D
    $1.60 \mathring A$
Answer
Correct option: C.
$0.85 \mathring A$
c
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MCQ 241 Mark
The effect caused by lanthanoid contraction is :
  • A
    Same oxidation state of Zr and Nb .
  • ✓
    Zr and Hf have almost same atomic size.
  • C
    Zr and Y have almst same atomic size.
  • D
    Same oxidation state of Zr and Zn .
Answer
Correct option: B.
Zr and Hf have almost same atomic size.
b
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MCQ 251 Mark
Which of the following pairs of ions the lower oxidation state is more stable?
  • A
    $Ti ^{+2}, Ti ^{3+}$
  • B
    $Cu ^{+1}, Cu ^{2+}$
  • C
    $Cr ^{2-}, Cr ^{3+}$
  • ✓
    $Mn ^{+2}, Mn ^{+4}$
Answer
Correct option: D.
$Mn ^{+2}, Mn ^{+4}$
d
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MCQ 261 Mark
Which of the following ions are diamagnetic?
  • A
    $Cu ^{2+}$
  • B
    $Ti ^{3+}, Co ^{2+}$
  • C
    $Ni ^{2+}, Mn ^{2+}$
  • ✓
    $Sc ^{3+}$
Answer
Correct option: D.
$Sc ^{3+}$
d
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MCQ 291 Mark
What will be the change in the oxidation state of Cr when $SO _2$ gas is passed into the aqueous solution of $K _2 Cr _2 O _7$ ?
  • A
    +3 to +1
  • ✓
    +6 to +3
  • C
    +3 to +6
  • D
    +6 to +4
Answer
Correct option: B.
+6 to +3
b
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MCQ 301 Mark
What is the general oxidation state of Lanthanoid series elements?
  • A
    +1
  • ✓
    +3
  • C
    +2
  • D
    +5
Answer
Correct option: B.
+3
b
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MCQ 311 Mark
Which pair of metals have almost the same size?
  • ✓
    $Cd , Hg$
  • B
    $Cu , Zn$
  • C
    $Sc , Ti ^{\prime}$
  • D
    $Cr . Mo$
Answer
Correct option: A.
$Cd , Hg$
a
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MCQ 321 Mark
Salts of transition metals are generally coloured, because :
  • A
    They contain completely filled d-orbitals.
  • B
    They absorb ultraviolet light.
  • ✓
    d-d transition occurs in them.
  • D
    They absorb energy from electromagnetic
Answer
Correct option: C.
d-d transition occurs in them.
c
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MCQ 331 Mark
Which of the following elements shows only one type of oxidation state?
  • A
    Mn
  • ✓
    Zn
  • C
    Cr
  • D
    Ni
Answer
Correct option: B.
Zn
b
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MCQ 341 Mark
Like other elements of d group, Zn does not show variable valence, because :
  • A
    It is a soft metal.
  • ✓
    The d-orbital is completely filled in it.
  • C
    Its melting point is low.
  • D
    There are two electrons in its outermost orbital.
Answer
Correct option: B.
The d-orbital is completely filled in it.
b
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MCQ 351 Mark
Which of the following ions will have the highest paramagnetic properties?
  • A
    $Cu ^{2+}$
  • ✓
    $Mn ^{2+}$
  • C
    $Zn ^{2+}$
  • D
    $Ti ^{2+}$
Answer
Correct option: B.
$Mn ^{2+}$
b
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MCQ 361 Mark
What can the highest oxidation state of a transition element be equal to?
  • A
    $n s$ electron
  • B
    $(n-1) d$ electron
  • ✓
    $(n-1) d+n s$ electrons
  • D
    $(n+1) d$ electrons
Answer
Correct option: C.
$(n-1) d+n s$ electrons
c
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MCQ 381 Mark
The pair of transition metals is :
  • A
    $Lu , Cu$
  • B
    $Lu , Zn$
  • C
    $Cu , Zn$
  • ✓
    $Au , Cu$
Answer
Correct option: D.
$Au , Cu$
d
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MCQ 391 Mark
Which of the following ions has the maximum magnetic moment?
  • A
    $V ^{3+}$
  • ✓
    $Fe ^{3+}$
  • C
    $Co ^{3+}$
  • D
    $Cr ^{3+}$
Answer
Correct option: B.
$Fe ^{3+}$
b
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MCQ 401 Mark
The aqueous solution of which of the following ions will not be coloured?
  • A
    $Mn ^{2+}$
  • B
    $Fe ^{2+}$
  • ✓
    $Zn ^{2+}$
  • D
    $Cr ^{2+}$
Answer
Correct option: C.
$Zn ^{2+}$
c
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MCQ 411 Mark
Which element of the first transition series shows the highest oxidation state?
  • A
    Ni
  • B
    Fe
  • ✓
    Mn
  • D
    Cr
Answer
Correct option: C.
Mn
c
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