The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Mohr’s salt is a

A
Normal salt

B
Acidic salt

C
Basic salt Acidic salt

D
Double salt

Solution

Mohr Salt is FeSO₄.(NH₄)₂.6H₂O. It is obtained by a combination of two different salts which were crystallized in the same regular ionic lattice. It is formed by an equimolar mixture of ferrous sulphate and ammonium sulphate. Since two salts are involved, Mohr salt is a double salt.
Question 2
1 / -0

Which one of the following is an example of non – typical transition elements?

A
Be, Al,Pb

B
Li, Na, K

C
Ba, Ga, Sr

D
Zn, Cd, Hg

Solution

Zn, Cd and Hg are not considered as transition elements because they do not have incompletely filled d orbital in it's ground state or stable oxidation state.
Question 3
1 / -0

Zr and Hf have almost equal atomic and ionic radii because

A
Of lanthanoid contraction

B
Of actinoid contraction

C
Both belong to same transition series

D
Of diagonal relationship

Solution

As after lanthanum, electron filling take place in f-subshell. Electrons present in f-subshell didn't do good shielding due to which with the increasing atomic number or increasing effective nuclear charge size gets constricted and size of Hf and Zr becomes almost equal.
Question 4
1 / -0

What is the shape of Fe(CN)₅ molecule?

A
Trigonal bipyramidal

B
Octahedral

C
Tetrahedral

D
Square pyramidal

Solution

Fe has 5 carbonyl ligands around it i.e. CN=5. It has trigonal bipyramidal geometry with dsp³ hybridisation.
Question 5
1 / -0

Which of the following compound is amphoteric?

A
Cr(OH)₃

B
Fe(OH)₂

C
Cr(OH)₂

D
Fe(OH)₃

Solution

Amphoteric substances are those which can act as either acids or bases. Cr(OH)₃ in water produces either salts (chromates), if combined with alkaline hydroxides (strong bases) such as potassium or sodium chromates and it can produce chromium salts if combined with strong acids (HCl, HF, H₂SO₄etc.) giving chromium sulfate, chloride, fluoride etc.
Question 6
1 / -0

Which of the following sulphides is soluble in aqua regia?

A
CdS

B
HgS , ZnS

C
ZnS

D
HgS

Solution

HgS is only soluble in aqua regia. Aqua regia is a mixture of concentrated HCl and concentrated HNO₃in ratio 3:1. The solubilization turns Hg in HgCl₄^2-, a complex called chloromercurate which is stable in water.
3HgS + 2NO₃^- + 12Cl^- + 8H₃O⁺ ⇔3HgCl₄^2- + 2NO + 12H₂O + 3S
Question 7
1 / -0

Silver is refined by cupellation process. The process removes the impurity of

A
Pb

B
Pt

C
Au

D
Cu

Solution

Cupellation is a refining process in metallurgy, where ores or alloyed metals are treated under very high temperatures and have controlled operations to separate noble metals, like gold and silver, from base metals like lead, copper, zinc or bismuth, present in the ore. Cupellation removes the impurity of Pb from silver. The reaction is given as below:
Ag(s) + 2Pb(s) + O₂(g) → 2PbO(absorbed) + Ag(l)
Question 8
1 / -0

Mohr’s salt is a better volumetric agent then ferrous sulphate because

A
Its reaction are less violent

B
It is less readily oxidised in the solid state

C
It does not effloresce like ferrous sulphate

D
All the chemical reactions given by ferrous sulphate are given by Mohr’s salt

Solution

Mohr’s salt is a better volumetric agent than ferrous sulphate because it is less readily oxidised in the solid state. Also Mohr’s salt is more stable than FeSO₄.
Question 9
1 / -0

Red hot steel rods on suddenly immersing in water become

A
Hard and brittle

B
Fibrous

C
Soft and malleable

D
Tough and ductile

Solution

Red hot steel rods on suddenly immersing in water become hard and brittle.
Question 10
1 / -0

Which of the following methods is based on distribution law?

A
Mond’s process

B
Cupellation process

C
Poling process

D
Parkes process

Solution

The parkes process is for removing silver from lead. It is an example of liquid-liquid extraction.

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The d- and f- Block Elements Test - 5

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The d- and f- Block Elements Test - 5

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Question 1

Normal salt

Acidic salt

Basic salt Acidic salt

Double salt

Solution

Question 2

Be, Al,Pb

Li, Na, K

Ba, Ga, Sr

Zn, Cd, Hg

Solution

Question 3

Of lanthanoid contraction

Of actinoid contraction

Both belong to same transition series

Of diagonal relationship

Solution

Question 4

Trigonal bipyramidal

Octahedral

Tetrahedral

Square pyramidal

Solution

Question 5

Cr(OH)3

Fe(OH)2

Cr(OH)2

Fe(OH)3

Solution

Question 6

CdS

HgS , ZnS

ZnS

HgS

Solution

Question 7

Pb

Pt

Au

Cu

Solution

Question 8

Its reaction are less violent

It is less readily oxidised in the solid state

It does not effloresce like ferrous sulphate

All the chemical reactions given by ferrous sulphate are given by Mohr’s salt

Solution

Question 9

Hard and brittle

Fibrous

Soft and malleable

Tough and ductile

Solution

Question 10

Mond’s process

Cupellation process

Poling process

Parkes process

Solution

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Cr(OH)₃

Fe(OH)₂

Cr(OH)₂

Fe(OH)₃