d and f-Block Elements Test

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d and f-Block Elements Test - 15

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Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

A
(n - 1) d³ns²

B
(n - 1) d⁵ns¹

C
(n - 1) d⁸ns²

D
(n - 1) d⁵ns²

Solution

(n - 1) d⁵ns² attains the maximum oxidation state of+ 7.
Question 2
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Among the following series of transition metal ions, the one where all metal ions have 3d² electronic configuration is (Atomic number, Ti = 22, V = 23, Cr = 24, Mn = 25)
[AIEEE 2004]

A
Ti³⁺, V²⁺, Cr³⁺, Mn⁴⁺

B
Ti⁺, V⁴⁺, Cr⁶⁺, Mn⁷⁺

C
Ti⁴⁺, V³⁺, Cr²⁺, Mn³⁺

D
Ti²⁺, V³⁺, Cr⁴⁺, Mn⁵⁺

Solution

Ti²⁺,V³⁺,Cr⁴⁺ and Mn⁵⁺ show 1s²2s²2p⁶3s²3p⁶4s⁰3d² electronic configuration.
Question 3
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For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order?

A
Mn > Cr > Fe > Co

B
Fe > Mn > Co > Cr

C
Co > Mn > Fe > Cr

D
Cr > Mn > Co > Fe

Solution

Mn²⁺ (d⁵) > Cr²⁺ (d⁴) > Fe²⁺ (d⁶) > Co²⁺ (d⁷) Mn²⁺ is more stable due to half-filled configuration, i . e . d⁵.
Question 4
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The catalytic activity of transition metals and their compounds is mainly due to

A
their magnetic behaviour

B
their ful-filled d-orbitals

C
their ability to adopt variable oxidation states

D
their chemical reactivity

Solution

The variability of oxidation state, a characteristic of transition element arises due to incomplete filling of d-orbitals.
Question 5
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Many copper (I) compounds are unstable in aqueous solution and undergo disproportionation as 2Cu⁺ → Cu + Cu²⁺ . This is due to

A
free energy change of reaction is positive

B
free energy of reaction is negative

C
second ionisation energy of Cu is higher than first ionisation energy

D
hydration energy of Cu⁺ is less than Cu²⁺

Solution

Cu (I) undergoes spontaneous disproportionation.

hus, ΔG is negative (spontaneous) for disproportionation.
Question 6
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Gun metal is an alloy of

A
Cu and Al

B
Cu and Sn

C
Cu,Zn and Sn

D
Cu,Zn and Ni

Solution

Gun metal is an alloy of Cu, Zn and Sn. It contains 88% Cu 10% Sn and 2% Zn.
Question 7
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In which of the following pairs both the ions are coloured in aqueous solution? (Atomic number, Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

A
Sc³⁺ and Ti³⁺

B
Sc³⁺ and Co²⁺

C
Ni²⁺ and Cu⁺

D
Ni²⁺ and Ti³⁺

Solution

Ni²⁺ and Ti³⁺ ions are coloured in aqueous solution because they contain unpaired electrons.
Question 8
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[Ti (H₂O)₆]³⁺ absorbs green and yellow region part of visible light. Then the transmitted colour of the compound is

A
purple

B
green

C
blue

D
red

Solution

We know that white light is composed of many different colours. When white light is allowed to fall on [Ti(H₂O)₆]³⁺ ion, this ion absorbs the light of green and yellow colour and transmits is almost purple colour.The purple colour of the transmitted light is called complimentary colour of that of absorbed light.
Question 9
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Compound of metal ion M^X+(Z = 26) has a spin only magnetic moment of BM The number of unpaired electrons and x value in the compound are

A
2 and 4

B
3 and 4

C
2 and 5

D
5 and 3

Solution

Metal ion is Fe³⁺ which have 5 unpaired electrons.
Question 10
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In which of the following the stability of two oxidation states is correctly represented?

A
Ti³⁺ > Ti⁴⁺

B
Mn²⁺ > Mn³⁺

C
Fe²⁺ > Fe³⁺

D
Cu⁺ > Cu²⁺

Solution

Mn²⁺ (d⁵) is more stable than Mn³⁺(d⁴) because Mn²⁺ have half-filled configuration.
Question 11
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Matching List Type
Direction (Q. No. 11-13) Choices fo r the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Q.
Match the Column I with Column II and mark the correct option from the given codes.

A

B

C

D

Solution

(i) → (s),(ii) → (p),(iii) → (q) (iv) → (r)
Question 12
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Match the Column I with Column II and mark the correct option from the given codes.

A

B

C

D

Solution

(i) → (s), (ii) → (s), (iii) → (p),(iv) → (q)
Question 13
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Match the Column I with Column II and mark the correct option from the given codes.

A

B

C

D

Solution

Fenton’s reagent (Fe SO₄ + H₂O₂) is used for oxidising alcohol to aldehyde. Zeigler-Natta catalyst [AI(C₂H₅)₃ + TiCI₄] is used for manufacture of polythene.
(i) → (Q). (ii) → (r), (iii) → (s), (iv) → (p)
Question 14
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Statement Type
Direction : This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Q.
Statement l : ,Cu₂O and Ni-DMG complex are coloured.
Statement II : It is due to charge transfer transition.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Colours of ,Cu₂O and Ni-DMG complex are due to charge transfer transition.
(iv) Sodium sulphite is a reducing agent. It reduces acidified K₂CrO₇ to chromic sulphate which is green in colour.