The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Platinum, Palladium and Iridium are called noble metals because:

A
Alfred Nobel discovered them

B
they are shining lustrous and pleasing to look at

C
they are found in native state

D
they are inert towards many common reagents

Solution

These elements are called noble metals because they are not acted upon by even strong acids and bases.
Question 2
1 / -0

Which one of the following metal ion is coloured?

A
$$Ti^{2+}$$

B
$$Cu^+$$

C
$$V^{4+}$$

D
$$Zn^{2+}$$

Solution

The metal ion $$\displaystyle V^{4+} $$ is coloured.

Atomic number of Vanadium is 23

Electronic configuration of V $$\displaystyle =[Ar]4s^23d^3$$

Electronic configuration of $$\displaystyle V^{+4}=[Ar]3d^1 $$

It contains one unpaired electron hence it is coloured.

Hence the correct option is C.
Question 3
1 / -0

Which of the following commonly forms an ionic compounds as a $$-1$$ anion?

A
$$\displaystyle C$$

B
$$\displaystyle N$$

C
$$\displaystyle O$$

D
$$\displaystyle Fe$$

E
$$\displaystyle Ne$$

Solution

$${ Na }_{ 2 }O$$ is an ionic compound
$${ Na }^{ 2+ }\quad { O }^{ 2- }\ \rightarrow $$ Oxygen is forming ionic compound as an anion.
Question 4
1 / -0

Identify the pairs of ions possessing equal spin only magnetic moments:

A
$$Co^{-2}, Ni^{+2}$$

B
$$Co^{+2}, Cr^{+3}$$

C
$$Fe^{+2}, Fe^{+3}$$

D
$$Fe^{+2}, Cr^{+3}$$

Solution

Spin Magnetic moment is $$ \sqrt{n(n+2)} $$
where n is the number of unpaired electrons in $$Co^{+2}$$ and $$Cr^{+3} $$ the number of unpaired electrons is $$2$$. So they have same spin magnetic moment
Question 5
1 / -0

The spin only magnetic moment of $$Ni^{2+}$$ (in B.M.) in aqueous solution will be:

A
$$1.73$$

B
$$2.82$$

C
$$3.42$$

D
$$2.25$$

Solution

$$\displaystyle Ni^{2+}:\ [Ar]3d^8 $$ has 2 unpaired electrons.

The spin only magnetic moment, $$\displaystyle \mu=\sqrt{n(n+2)}$$

$$=\sqrt{2(2+2)}=\sqrt{8}$$

$$=2.82$$ B.M
Question 6
1 / -0

Copper (II) sulfate solution is:

A
red

B
purple

C
orange

D
green

E
blue

Solution

Copper (II) sulphate solution is blue in colour.
Note: Hydrated copper sulphate $$\displaystyle CuSO_4 \cdot 5 H_2O$$ is blue in colour and anhydrous copper sulphate $$\displaystyle CuSO_4$$ is anhydrous.
Question 7
1 / -0

The aqueous solutions of copper sulphate and zinc sulphate appear :

A
blue and green respectively

B
green and colourless respectively

C
blue and brown respectively

D
blue and colourless respectively

Solution

The solution of Copper sulphate is Blue in color and that of Zinc sulphate is colourless because zinc is more reactive than copper and displaces copper from copper sulphate solution.

Hence, option $$D$$ is correct.
Question 8
1 / -0

Which of the following ions has the maximum magnetic moment?

A
$$Co^{2+}$$

B
$$Fe^{3+}$$

C
$$Sc^{3+}$$

D
$$Cr^{+3}$$
Question 9
1 / -0

Are the most readily oxidized elements within a given period

A
3d Transition metals

B
Alkali metals

C
Halogens

D
Noble gases

E
Actinides

Solution

3d transition metals are the most readily oxidized in a given period as they show variable oxidation states and form complexes easily.
Question 10
1 / -0

Which one of the following shows highest magnetic moment?

A
$${Fe}^{2+}$$

B
$$C{o}^{2+}$$

C
$${Cr}^{3+}$$

D
$${Ni}^{2+}$$

Solution

Highest magnetic moment is shown by the ion having maximum number of unpaired electron which if in the case of $$Fe^{2+}$$ having 4 unpaired electrons in the electronic configuration.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 31

Result

The d- and f- Block Elements Test - 31

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SHARING IS CARING

Question 1

Alfred Nobel discovered them

they are shining lustrous and pleasing to look at

they are found in native state

they are inert towards many common reagents

Solution

Question 2

$$Ti^{2+}$$

$$Cu^+$$

$$V^{4+}$$

$$Zn^{2+}$$

Solution

Question 3

$$\displaystyle C$$

$$\displaystyle N$$

$$\displaystyle O$$

$$\displaystyle Fe$$

$$\displaystyle Ne$$

Solution

Question 4

$$Co^{-2}, Ni^{+2}$$

$$Co^{+2}, Cr^{+3}$$

$$Fe^{+2}, Fe^{+3}$$

$$Fe^{+2}, Cr^{+3}$$

Solution

Question 5

$$1.73$$

$$2.82$$

$$3.42$$

$$2.25$$

Solution

Question 6

red

purple

orange

green

blue

Solution

Question 7

blue and green respectively

green and colourless respectively

blue and brown respectively

blue and colourless respectively

Solution

Question 8

$$Co^{2+}$$

$$Fe^{3+}$$

$$Sc^{3+}$$

$$Cr^{+3}$$

Question 9

3d Transition metals

Alkali metals

Halogens

Noble gases

Actinides

Solution

Question 10

$${Fe}^{2+}$$

$$C{o}^{2+}$$

$${Cr}^{3+}$$

$${Ni}^{2+}$$

Solution

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