The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 32

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Weekly Quiz Competition

Question 1
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Which of the following is not an actinoid?

A
$$Curium (Z = 96)$$

B
$$Californium (Z = 98)$$

C
$$Uranium (Z = 92)$$

D
$$Terbium (Z = 65)$$

Solution

Explanation:
The actinides can be identified based on the outermost orbitals. The valence electrons of the actinides enter into the 5f-orbital.

Electronic configuration of curium:- [Rn] $${5f}^{7} {6d}^{1}$$

The energy of 6d orbitals is less than the 5f orbital, so the electrons first enter into 6d orbitals, and then the remaining valence electrons enter into 5f orbital. Thus, Curium is an actinoid.

Electronic configuration of californium:- [Rn] $${5f}^{10} {7s}^{2}$$

The energy of 7s orbitals is less than the 5f orbital, so the electrons first enter into 7s orbitals, and then the remaining valence electrons enter into 5f orbital. Thus, Californium is an actinoid.

Electronic configuration of uranium:- [Rn] $${5f}^{3}$$

The valence electrons of the uranium element enter into 5f-orbital so the uranium is an actinoid.

Electronic configuration of terbium:- [Xe] $${4f}^{9} {6s}^{2}$$

The energy of 6s orbitals is less than the 4f orbital, so the electrons first enter into 6s orbitals, and then the remaining valence electrons enter into 4f orbital. Thus, Terbium is lanthanoid and not actinide.

Correct Option: $$D$$
Question 2
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Silver salt used in photography is:

A
$$AgCl$$

B
$$AgNO_3$$

C
$$AgF$$

D
$$AgBr$$

Solution

Silver salt used in photography is silver bromide $$AgBr$$. On exposure to light, $$AgBr$$ is reduced to black silver.

$$\displaystyle 2AgBr (s) \xrightarrow {light} 2Ag(s) +Br_2(l)$$

Bromide ion transfers an electron to silver ion forming silver metal.

Hence, option $$D$$ is correct.
Question 3
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The metals present in Nichrome alloy is:

A
$$Cr,Ni,Fe$$

B
$$Cr,Co,Ni$$

C
$$Cr,Fe$$

D
$$Cr,Fe,Cu$$

Solution

Nichrome alloy is an alloy of nickel, chromium and iron. It is used in electric heating elements in the application such as hairdryer, ironing, heat guns, etc.

Hence, option $$A$$ is correct.
Question 4
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What is geometry of chromate ion?

A
Tetrahedral

B
Octahedral

C
Trigonal planer

D
Linear

Solution

The chromate ion $$(CrO^{2-}_4)$$ has a tetrahedral shape, whereas dichromate ion has two tetrahedral units with one common oxygen having $$Cr-O-Cr$$ bond angle of $$126^o$$.
Question 5
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Fuel used in nuclear power plants is:

A
Uranium - 235

B
Plutonium - 235

C
Plutonium - 238

D
Uranium - 238

Solution

Nuclear fuel is a substance that is used in nuclear power stations to produce heat to power turbines. Heat is created when nuclear fuel undergoes nuclear fission.

Most nuclear fuels contain heavy fissile elements that are capable of nuclear fission, such as uranium - 235 or plutonium - 239. When the unstable nuclei of these atoms are hit by a slow-moving neutron, they split, creating two daughter nuclei and two or three more neutrons. These neutrons then go on to split more nuclei. This creates a self-sustaining chain reaction that is controlled in a nuclear reactor, or uncontrolled in a nuclear weapon.
Question 6
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In which pair highest oxidation states of transition metals are found?

A
Nitrides and Chlorides

B
Fluorides and Chlorides

C
Fluorides and Oxides

D
Nitrides and Oxides

Solution

The highest oxidation states of transition metals are found in fluorides and oxides since fluorine and oxygen are the most electronegative elements and small in size.
Question 7
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____________ is used in gas lamp material.

A
$$MnO_2$$

B
$$CeO_2$$

C
$$N_2O_5$$

D
$$Fe_2O_3$$

Solution

Cerium dioxide $$\displaystyle CeO_2$$ is used in gas lamp material. The oxides of lanthanum, cerium, yttrium and magnesium are used for gas lamp materials.
Question 8
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Which of the following compounds will not give $$+ve$$ chromyl chloride test?

A
$$CuCl_2$$

B
$$HgCl_2$$

C
$$ZnCl_2$$

D
$$C_6H_5NH_{2}HCl$$

Solution
Question 9
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Identify the metal that forms colourless compounds.

A
Iron (Z = 26)

B
Chromium (Z = 24)

C
Vanadium (Z = 23)

D
Scandium (Z = 21)

Solution

$$\displaystyle Scandium (Z = 21)$$ forms colourless compounds.

$$\displaystyle Scandium (Z = 21)$$ has valence shell electron configuration of $$\displaystyle 3d^1 \: 4s^2$$

In its $$\displaystyle +3$$ oxidation state, it looses 3 electrons and has valence shell electron configuration of $$\displaystyle 3d^0 \: 4s^0$$. Since no unpaired electron is present, it forms colourless compounds.
Question 10
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Which of the following is true regarding derivation of the name of californium?

A
The name of californium was derived from the name of the place.

B
The name of californium was derived from its color.

C
The name of californium was derived from the name of the scientist who discovered it.

D
The name of californium was derived from mythological character name.

Solution

The name of californium was derived from the name of the state and University of California.

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The d- and f- Block Elements Test - 32

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The d- and f- Block Elements Test - 32

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Question 1

$$Curium (Z = 96)$$

$$Californium (Z = 98)$$

$$Uranium (Z = 92)$$

$$Terbium (Z = 65)$$

Solution

Question 2

$$AgCl$$

$$AgNO_3$$

$$AgF$$

$$AgBr$$

Solution

Question 3

$$Cr,Ni,Fe$$

$$Cr,Co,Ni$$

$$Cr,Fe$$

$$Cr,Fe,Cu$$

Solution

Question 4

Tetrahedral

Octahedral

Trigonal planer

Linear

Solution

Question 5

Uranium - 235

Plutonium - 235

Plutonium - 238

Uranium - 238

Solution

Question 6

Nitrides and Chlorides

Fluorides and Chlorides

Fluorides and Oxides

Nitrides and Oxides

Solution

Question 7

$$MnO_2$$

$$CeO_2$$

$$N_2O_5$$

$$Fe_2O_3$$

Solution

Question 8

$$CuCl_2$$

$$HgCl_2$$

$$ZnCl_2$$

$$C_6H_5NH_{2}HCl$$

Solution

Question 9

Iron (Z = 26)

Chromium (Z = 24)

Vanadium (Z = 23)

Scandium (Z = 21)

Solution

Question 10

The name of californium was derived from the name of the place.

The name of californium was derived from its color.

The name of californium was derived from the name of the scientist who discovered it.

The name of californium was derived from mythological character name.

Solution

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