The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The catalytic activity of the transition metals and their compounds is ascribed to their

A
Chemical reactivity

B
Magnetic behaviour

C
Unfilled d-orbitals

D
Ability to adopt multiple oxidation states and their complexing ability

Solution

Option (D) is correct.
The catalytic activity of the transition metals and their compounds is ascribed to their ability to adopt multiple oxidation states and their complexing ability.
Catalysis at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise $$3d$$ and $$4s$$ electrons for bonding). This has the effect of increasing theconcentration of the reactants at the catalyst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering). Also because the transition metal ions can change their oxidation states, they become more effective as catalysts. For example, iron(III) catalyses the reaction between iodide and persulphate ions.
Question 2
1 / -0

Transition metals show paramagnetism due to

A
Characteristic configuration

B
high lattice energy

C
variable oxidation states

D
unpaired electrons

Solution

Magnetic moment is $$\mu = \sqrt {n(n+2)}$$ where n is no of unpaired electron so transition metals show paramagnetism due to unpaired electron.
Question 3
1 / -0

Chromium - plated steel is a material of popular use. During its process of manufacture, the effluent contains chromate and cyanide ions as impurities. After these are chemically removed, carbon dioxide and salt (sodium chloride) still remain as impurities. This salt solution is purified electrolytically by adding carbonaceous matter which acts as:

A
a microcell

B
an electrode

C
a cathode

D
a salt absorber

Solution

The above-given salt-solution is purified electrolytically by adding carbonaceous matter which acts as a microcell.
Question 4
1 / -0

Gallium is in __________ state at room temperature.

A
plasma

B
liquid

C
solid

D
gaseous

Solution

Gallium is in liquid state at room temperature. The melting point of gallium is $$303K$$.
Question 5
1 / -0

Zinc chromate and lead chromate are used as:

A
lakes

B
lacquers

C
mordants

D
pigments

Solution

Zinc Chromate (ZnCrO$$_4$$) and Lead Chromate (PbCrO$$_4$$) are used as pigments, paints, spray paints, artist paints , etc.
Question 6
1 / -0

Which of the following statement is not correct?

A
$$La(OH)_3$$, is less basic than $$Lu(OH)_3$$

B
In lanthanide series, ionic radius of $$Ln^3+$$ ions decreases

C
$$La$$ is actually an element of transition series rather than lanthanide series

D
Atomic radii of $$Zr$$ and $$Hf$$ are same because of lanthanide contraction

Solution

Size of $$La^{+3}$$ to $$Lu^{+3}\downarrow$$
So polarising power $$\uparrow$$
So colvalent character $$\uparrow$$
Ionic or basic characters of hydroxide $$\downarrow$$
Basic nature $$La(OH)_3 > Lu(OH)_3$$
Question 7
1 / -0

Monazite is an ore of:

A
titanium

B
throium

C
zirconium

D
iron

Solution

Monazite is a prosphate material containing rare earth metals. It is reddish in colour. It is an important ore for throium, lanthanum, cerium.
Question 8
1 / -0

Titanium oxide is added in interior paints for walls of rooms, halls and galleries to give :

A
a whiter 'white'

B
a greener 'green'

C
a redder 'red'

D
silver-white

Solution

Titanium oxide is added in intercor paints for walls of room, halls and galleries to give :- a whiter white.
Question 9
1 / -0

Lanthanides and actinides resemble in:

A
electronic configuration

B
oxidation state

C
ionization energy

D
formation of complexes

Solution

Lanthanides and actinides resemble in electronic configuration:
$$(n-2)f^{1-14}(n-1)d^{1-10}ns^{1-2}$$
Question 10
1 / -0

It is sometimes necessary to remove colouring matter contained as an impurity in glass. Glass is decolourised by:

A
wood charcoal

B
manganese dioxide

C
bleaching powder

D
hydrogen

Solution

Glass is decolourised by manganese dioxide.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 14

Result

The d- and f- Block Elements Test - 14

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SHARING IS CARING

Question 1

Chemical reactivity

Magnetic behaviour

Unfilled d-orbitals

Ability to adopt multiple oxidation states and their complexing ability

Solution

Question 2

Characteristic configuration

high lattice energy

variable oxidation states

unpaired electrons

Solution

Question 3

a microcell

an electrode

a cathode

a salt absorber

Solution

Question 4

plasma

liquid

solid

gaseous

Solution

Question 5

lakes

lacquers

mordants

pigments

Solution

Question 6

$$La(OH)_3$$, is less basic than $$Lu(OH)_3$$

In lanthanide series, ionic radius of $$Ln^3+$$ ions decreases

$$La$$ is actually an element of transition series rather than lanthanide series

Atomic radii of $$Zr$$ and $$Hf$$ are same because of lanthanide contraction

Solution

Question 7

titanium

throium

zirconium

iron

Solution

Question 8

a whiter 'white'

a greener 'green'

a redder 'red'

silver-white

Solution

Question 9

electronic configuration

oxidation state

ionization energy

formation of complexes

Solution

Question 10

wood charcoal

manganese dioxide

bleaching powder

hydrogen

Solution

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