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12th Chemistry weekly Test -1 ( Transition and Inner Transition Elements )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test -1 ( Transition and Inner Transition Elements )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Of these statement, which statement is incorrect in most of the transition elements are _____________

hexagonal close packed
cubic close packed
face centered cubic
symmetrical distribution

Acidified solution of chromic acid on treatment with H₂O₂ give blue colour which is due to ____________

CrO₃ + H₂O + O₂
H₂Cr₂O₇+ H₂O + CO₂
Cr₂O₃ + H₂O + O₂
CrO₅ + H₂O

Identify the correct reason for lanthanide contraction

Decreasing nuclear charge
Decreasing screening effect
Increasing nuclear charge
Negligible screening effect

The number of moles of acidified KMnO₄required to oxidize 1 mole of ferrous oxalate(FeC₂O₄) is

5
3
0.6
1.5

Which of the following statement is correct for 3d-transition element?

All metals except Zn and Sc form 'MO' Oxide
All metals except Sc forms 'MO' Oxide
All metals except Zn forms 'MO' Oxide
All metals except Mn forms 'MO' Oxide

The most common oxidation state of actinoids is

+2
+3
+4
+6

Which of the following is coloured due to charge transfer?

MnO₄^-
CrO₄^2-
Cu₂O
All of these

Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because

Ce⁴⁺ and Yb²⁺acquire f⁷ configuration
Ce⁴⁺ and Yb²⁺acquire f⁰ configuration
Ce⁴⁺ and Yb²⁺acquire f⁷and f¹⁴ configuration
Ce⁴⁺and Yb²⁺acquire f⁰ and f¹⁴ configuration

A white crystalline salt (A) react with dilute HCl to liberate a suffocating gas (B) and also forms a yellow precipitate . The gas (B) turns potassium dichromate acidified with dil H₂SO₄ to a green coloured solution(C). A, B and C are respectively

Na₂SO₃, SO₂, Cr₂(SO₄)₃
Na₂S₂O₃, SO₂, Cr₂(SO₄)₃
Na₂S, SO₂,Cr₂(SO₄)₃
Na₂SO₄, SO₂, Cr₂(SO₄)₃

The landthanide contraction is responsible for the fact that

Zr and Zn have the same oxidation state
Zr and Hf have almost the same radius
Zr and Nb have similar oxidation state
Zr and Y have similar radius

The trend in ionisation enthalpy of a transition element is not regular because,

removal of one electron alters the relative energies of 4s and 3d orbitals
due to different electronic configuration (stability)
Poor screening of 3p-orbital
due to decrease in effective nuclear charge

If the standard electrode potential (E^o) of a inetal is and __ the metal is a powerful reducing agent.

large, negative
large, positive
small, negative
small, positive

Which one of the following exhibits highest oxidation state?

Ni
Mn
V
Zr

The magnetic moment of Mn²⁺ ion is

5.92BM
2.80BM
8.95BM
3.90BM

The correct order of increasing oxidizing power in the series

VO₂⁺ < Cr₂O₇^2- < MnO₄^-
Cr₂O₇^2- < VO₂⁺ < MnO₄^-
Cr₂O₇^2- < MnO₄^- < VO₂⁺
MnO₄^- < Cr₂O₇^2- < VO₂⁺

The reaction of aqueous KMnO₄ with H₂O₂ in acidic condition gives

Mn⁴⁺ and MnO₂
Mn⁴⁺ and O₂
Mn₂₊ and O₂
Mn₂₊ and O₃

The element corresponding to the electronic configuration [Rn]5f³ 6d¹7s²is _________

Neptunium
Plutonium
Uranium
Americium

Identify the paramagnetic species

Cu⁺
Cr⁺
MnO₄
Zn²⁺

________ has the highest electrical conductivity at room temperature.

Chromium
Copper
Silver
Cadmium

FeSO₄ on heating gives ____________

SO_² and O₂
SO₂and SO₃
SO₂
SO₃

Part - B

Generic 2 - Answer All Question

Why europium (II) is more stable than Cerium (II)?

Justify the position of lanthanides and actinides in the periodic table.

Describe the preparation of potassium dichromate.

Transition metals show high melting points why?

Compare the ionization enthalpies of first series of the transition elements.

Why Europium (II) is more stable than Cerium (II)?

What is lanthanide contraction and what are the effects of lanthanide contraction?

Explain why compounds of Cu²⁺ are coloured but those of Zn²+ are colourless.

Actinoid contraction is greater from element to element than the lanthanoid contraction, why?

Comparing La(OH)₃ and Lu(OH)₃, which is more basic and explain why?

Give the general electronic configuration of actinoides?

Explain why Cr²⁺ is strongly reducing while Mn3+ is strongly oxidizing.

Calculate the number of unpaired electrons in Ti³⁺ , Mn²⁺ and calculate the spin only magnetic moment.

Write the outer electronic configuration of Cr atom (Z=24).

Why transition elements form complexes? (OR) Why do d-block elements form: complexes?

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