The correct trend for I.E 1 (1st Ionization Enthalpy) in 3d series is:

Irregular trend is observed for ionization energy because of electronic configuration.

Ionisation energy regularly decreases on moving along the period.

Ionisation energy regularly increases on moving along the period.

Match List-I with List-II List-I List-II (a) Fe CN 6 3 - (i) 5.92 BM (b) Fe H 2 O 6 3 + (ii) 0 BM (c) Fe CN 6 4 - (iii) 4.90 BM (d) Fe H 2 O 6 2 + (iv) 1.73 BM Choose the correct answer from the options given below.

(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

Statement 1: Silver atom has completely filled d orbitals (4d 10 ) in its ground state. Statement 2: Silver is not a transition element.

Statement 1 is true , statement 2 is false.

Statement 1 is false, statement 1 is true.

Chemistry - D F Block Elements - Quiz-9

Transition metals and their many compounds act as good catalysts due to -

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Variable oxidation states.
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Unstable intermediate.
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Provide a suitable surface.
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All of the above.

Transition metals show paramagnetic behavior due to :

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Paired electrons in the (n-1) d-orbitals
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Unpaired electrons in the (n-1) d-orbitals
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Due to $d^{10}, and d^{0}$ configuration
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None of the above

Consider the following statements.

a. Lanthanoid and actinoid belong to the f block and their general electronic configuration is ${nf}^{1 - 14} n - 1 {d^{0}}^{- 1} n s^{2}$ .

b. All lanthanides and actinoids show an oxidation state of +3.

c. The magnetic properties of the actinoids are more complex than those of the lanthanoids.

d. Lanthanoids are comparatively less electropositive than actinides

Correct statements amongst the above are:

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a, b
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c, d, a
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d, a, b
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b, c, d

The correct statement(s) about interstitial compounds is/are:

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Transition elements are large in size and contain multiple interstitial sites.
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Transition elements can trap atoms of other elements.
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Interstitial compounds are chemically inert.
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All of the above.

The spin-only magnetic moment of ${Ce}^{3 +}$ is -

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3.25
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1.73
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zero
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4.21

Match the following.

Ions	Number of unpaired electrons
i. ${Mn}^{3 +}$	a. 2
ii. ${Cr}^{3 +}$	b. 4
iii. $V^{3 +}$	c. 1
iv. ${Ti}^{3 +}$	d. 3

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i=c, ii=d, iii=b, iv=a
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i=b, ii=d, iii=a, iv= c
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i=d, ii=b, iii=a, iv= c
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i=b, ii=d, iii=c, iv= a

Coloured ions in an aqueous solution would be -

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${Ti}^{3 +}, V^{3 +}, {Cu}^{+}$
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${Sc}^{3 +}, {Mn}^{2 +}, {Fe}^{3 +}$
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${Ti}^{3 +}, V^{3 +}, {Mn}^{2 +}, {Fe}^{3 +}, {Co}^{2 +}$
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None of the above.

$a . {Cr}_{2} O_{7}^{2 -} + H^{+} + {Fe}^{2 +} \to 2 {Cr}^{3 +} + {Fe}^{3 +} + H_{2} O b . {Cr}_{2} O_{7}^{2 -} + H^{+} + I^{-} \to {Cr}^{3 +} + H_{2} O + I_{2} c . H_{2} S + {Cr}_{2} O_{7}^{2 -} + H^{+} \to {Cr}^{3 +} + H_{2} O + S$

The correct reactions are-

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a,c
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b, c
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a, b
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a, b, c

The true statement(s) regarding transition elements is :

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+2, and +3 oxidation states are more common for elements in the first transition series, while higher oxidation states are more common for the heavier elements.
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The heavier transition elements form only low-spin complexes.
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The atomic sizes of the elements of the first transition series are smaller than those of the heavier elements (elements of 2nd and 3rd transition series).
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All of the above.

The correct statement regarding inner transition elements is -

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The general electronic configuration of actinoids is ${[Xe]}^{54} 4 f^{1 - 14} 5 d^{0 - 1} 6 s^{2}$
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The general electronic configuration of lanthanoids is ${[Rn]}^{86} 5 f^{1 - 14} 6 d^{0 - 1} 7 s^{2}$
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Alkalies have no action on actinoids.
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The principal oxidation state of lanthanoids is +1

$(i) {FeCr}_{2} O_{4} + NaOH + O_{2} \underset{}{\to} . . . X . . . . . + {Fe}_{2} O_{3} + H_{2} O (ii) K_{2} {MnO}_{4} + O_{3} + H_{2} O \overset{}{\to} . . . . . Y . . . . + KOH + O_{2}$

The products X and Y in the above reactions (i) and (ii) are respectively:

$1 . {Na}_{2} {Cr}_{2} O_{7}, K_{2} {MnO}_{8} 2 . {Na}_{2} {CrO}_{4}, {KMnO}_{4} 3 . {Na}_{2} {Cr}_{2} O_{7}, {KMnO}_{4} 4 . {NaCrO}_{4}, {MnO}_{2}$

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1
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2
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3
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4

Correct statement(s) regarding transition elements is/are:-

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The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
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A transition metal exhibits the highest oxidation state in oxides and fluorides.
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The highest oxidation state is exhibited in oxo anions of a metal.
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All of the above.

The $E ° (M^{2 +} / M)$ value for copper is positive (+0.34V), because -

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Copper has a high energy of atomization, and low hydration energy.
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Copper has low energy of atomization and high hydration energy.
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Copper has equal energy of atomization and hydration energy.
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None of the above.

The correct trend for I.E₁(1st Ionization Enthalpy) in 3d series is:

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Ionisation energy regularly decreases on moving along the period.
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Ionisation energy regularly increases on moving along the period.
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Irregular trend is observed for ionization energy because of electronic configuration.
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None of the above.

The correct statement(s) regarding the oxidation state of transition elements is/are :

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The oxidation state can vary from +1 to +7
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Variable oxidation states are possible.
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Both (1) and (2)
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None of the above

The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:

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FeCr₂O₄+ NaOH + O₂→Na₂CrO₄ + Fe₂O₃ + H₂O
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Na₂CrO₄+ H₂SO₄ (conc.)→ Na₂Cr₂O₇+ Na₂SO₄+ H₂O
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Na₂Cr₂O₇+ KCl→K₂Cr₂O₇ + NaCl
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All of the above.

Consider the following graph.

Based on the graph above, it can be concluded that the element with melting point higher than 3000 K will be :

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Y
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X
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Z
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None of the above

Consider the graph between enthalpies of atomization of transition elements vs atomic numbers:

The curve representing enthalpies of atomization for 3d series is

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z
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y
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x
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Cannot predict from the graph

Zr (Z=40) and Hf (Z=72) have similar atomic and ionic radii because of:

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lanthanoid contraction
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having similar chemical properties
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belonging to same group
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diagonal relationship

The incorrect statement among the following is :

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Lanthanoids are good conductors of heat and electricity.
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Actinoids are highly reactive metals, especially when finely divided.
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Actinoid contraction is greater for element to element than Lanthanoid contraction.
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Most of the trivalent Lanthanoid ions are colorless in the solid-state.

Match List-I with List-II

List-I	List-II
(a) ${[Fe {(CN)}_{6}]}^{3 -}$	(i) 5.92 BM
(b) ${[Fe {(H_{2} O)}_{6}]}^{3 +}$	(ii) 0 BM
(c) ${[Fe {(CN)}_{6}]}^{4 -}$	(iii) 4.90 BM
(d) ${[Fe {(H_{2} O)}_{6}]}^{2 +}$	(iv) 1.73 BM

Choose the correct answer from the options given below.

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(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
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(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
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(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
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(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

Statement 1: Silver atom has completely filled d orbitals (4d¹⁰) in its ground state.
Statement 2: Silver is not a transition element.

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Statement 1 is true , statement 2 is false.
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Statement 1 is false, statement 1 is true.
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Both statements are true.
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Both statements are false.

Statement 1: Highest oxidation state of a metal is exhibited in its oxide or fluoride only.
Statement 2: Both oxide and fluoride ions are able to oxidise metals .

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Statement 1 is true, statement 2 is false.
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Statement 1 is false, statement 2 is true.
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Both statements are true.
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Both statements are false.

The ‘spin only’ magnetic moment of M²⁺_(aq) ion is :
(Z for 'M' = 27)

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3.87 BM
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5.10 BM
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1.73 BM
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2.45 BM

Cu⁺ ion is not stable in aqueous solutions, because :

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Hydration energy of Cu⁺² is more than the ionisation energy for Cu⁺
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Ionisation energy of Cu⁺ is more the hydration energy of Cu⁺²
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Hydration energy of Cu⁺² is equal to the ionisation energy of Cu⁺
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Both (2) and (3)

Statement 1: Actinoid contraction is greater from element to element than lanthanoid contraction.
Statement 2: 5f orbitals have a poorer shielding effect than 4f orbitals.

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Statement 1 is true, statement 2 is false.
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Statement 1 is false, statement 2 is true.
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Both statements are false.
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Both statements are true.

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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