Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 20

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Question 1
1 / -0

In Mendeleev table, the triad of VIII group is :

A
Ru, Rh, Pd

B
Cu, Ag, Au

C
N, O, F

D
Tl, Pb, Bi

Solution

Group VIII of Mendeleev's table consists of three triads known as transition triads and they are
i) Iron, Cobalt, and Nickel
ii) Ruthenium, Rhodium, and Palladium
iii) Osmium, Iridium, and Platinium
Option $$A$$ is correct.
Question 2
1 / -0

An element which is an essential constituent of all organic compounds belongs to :

A
group 1

B
group 14

C
group 15

D
group 16

Solution

The element which is an essential constituent of all organic compounds is carbon. It has the electronic configuration (2, 4). It is found in group 14.
Question 3
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Arrange the following elements in the order of their decreasing metallic character.
$$Na,\ Si,\ Cl,\ Mg,\ Al$$

A
$$Cl > Si >Al > Mg >Na$$

B
$$Na >Mg >Al >Si > Cl$$

C
$$Na > Al > Mg > Cl > Si$$

D
$$Al > Na> Si > Ca> Mg$$

Solution

Metallic character depends upon the ability to lose electrons. Metallic character decreases, on moving from left to right in a period because the force of attraction between the nucleus and the outermost electron increases thereby the atomic size decreases. Therefore, it becomes difficult for the metal to lose electrons from the outermost shell.

Therefore, the order is $$Na>Mg>Al>Si>Cl$$.
Question 4
1 / -0

The total number of inert gases among the following is:

H, He, Ne, F, Ar, Kr, K

A
1

B
2

C
3

D
4

Solution

From periodic table, it can be seen that the total number of inert gases is six.

Helium (He); Neon ( Ne); Argon (Ar); Krypton (Kr); Xenon (Xe); Radon (Rn). So, total number of inert gases among the following is 4.
Question 5
1 / -0

Mendeleev predicted the existence of certain elements not known at that time and named as Eka-aluminiumT he elements which have taken the place of Eka-aluminium is :

A
Germanium

B
Gallium

C
Silicon

D
Aluminium

Solution

Eka-silicon means germanium. It occurred because of silicon whereas eka-aluminium occurred because of aluminium and later named it gallium.

While filling the elements considering atomic number would be main and fundamental property there were gaps in the mentioned groups hence he filled them with these names.

Hence the correct option is $$B$$.
Question 6
1 / -0

The period of element with atomic number 20 in the periodic table is :

A
1

B
2

C
3

D
4

Solution

Atomic number with 20: (electronic configuration) 2, 8, 8, 2. The total number of shells are four, therefore it will belong to the fourth period.

Hence the correct option is D.
Question 7
1 / -0

The group number of element with atomic number 7 in the periodic table is:

A
2

B
18

C
15

D
14

Solution

Atomic no. $$7$$ is Nitrogen which is in group $$15.$$
Question 8
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Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original order?

A
Alkali metals

B
Alkaline earth metals

C
Non - metals

D
Noble gases

Solution

According to Mendeleevs classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties. Noble gas being inert, could be placed in a separate group without disturbing the original order.
Question 9
1 / -0

The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. Such an arrangement of elements called as :

A
Dobereiner triad

B
Mendeleev triad

C
Newland triad

D
None of the above.

Solution

Dobereiner observed in a few atoms that the mass of one atom is equal to the average of two atoms. He defined almost all properties based on atomic weight. Hence, this is called Dobereiner triad.

Lithium has 7, sodium has 23 whereas potassium has 39 as atomic masses.
$$ 23 = (7+39)/2 = 23$$

Here, we could observe that atomic mass of sodium is the average of atomic masses of potassium and lithium.
Question 10
1 / -0

According to Dobereiner's triads, the atomic mass of the 2nd element is equal to the __________ of 1st and 3rd elements in that triad.

A
Geometric Mean

B
Arithmetic Mean

C
Harmonic Mean

D
None of these

Solution

Döbereiner's triads were an early attempt to sort the elements into some logical order by their physical properties. It was by reported Johann Wolfgang Döbereiner's in 1817.
He also noted that quantifiable properties of elements (e.g. atomic mass) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly equal to the arithmetic mean of values for that property of the other two elements.
So, the correct option is B.

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Periodic Classification of Elements Test - 20

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Question 1

Ru, Rh, Pd

Cu, Ag, Au

N, O, F

Tl, Pb, Bi

Solution

Question 2

group 1

group 14

group 15

group 16

Solution

Question 3

$$Cl > Si >Al > Mg >Na$$

$$Na >Mg >Al >Si > Cl$$

$$Na > Al > Mg > Cl > Si$$

$$Al > Na> Si > Ca> Mg$$

Solution

Question 4

1

2

3

4

Solution

Question 5

Germanium

Gallium

Silicon

Aluminium

Solution

Question 6

1

2

3

4

Solution

Question 7

2

18

15

14

Solution

Question 8

Alkali metals

Alkaline earth metals

Non - metals

Noble gases

Solution

Question 9

Dobereiner triad

Mendeleev triad

Newland triad

None of the above.

Solution

Question 10

Geometric Mean

Arithmetic Mean

Harmonic Mean

None of these

Solution

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