Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 27

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Question 1
1 / -0

In a triad of $$A, B, C$$ elements, if the atomic masses of $$A$$ and $$C$$ respectively are $$100$$ and $$200$$, then the atomic mass of $$B$$ is:

A
$$300$$

B
$$175$$

C
$$125$$

D
$$150$$

Solution

According to Dobereiner's law of traid, the average of the masses of the first and the last element is equal to the atomic mass of the middle element. So, $$\dfrac{100+200}{2}$$ = 150. Hence, the atomic mass of $$B$$ is 150.

Hence, the correct option is $$\text{D}$$
Question 2
1 / -0

Who is father of the Periodic Table of Elements?

A
Johann Baeyer

B
Dmitri Mendeleev

C
Alfred Nobel

D
Johannes Van der Waals

Solution

Dmitri Mendeleev is known as father of periodic table of elements.
Question 3
1 / -0

For which of the pair Newland octave rule is not applicable?

A
$$Li,\ Na$$

B
$$C,\ Si$$

C
$$Mg,\ Ca$$

D
$$Cl,\ Br$$

Solution

According to Newland Octave law, when elements are arranged in increasing atomic mass every eighth element has similar properties to the first element.
Further, the law did not apply to elements of higher atomic masses. So, the law was applicable till calcium.
Hence, $$Cl, Br$$ does not apply to Newland Octave Rule.
Question 4
1 / -0

Which of the following is arranged in order of increasing metallic character?

A
$$P < Si < Na < Be < Mg$$

B
$$Be < Mg < P < Na < Si$$

C
$$Si < Be > Mg < Na < P$$

D
$$P < Si < Be < Mg < Na$$
Solution
Metallic character depends on the two factors:
Effective nuclear charge
Distance from the nucleus
On moving across the period effective nuclear charge increases and the tendency to lose electrons decreases. Down the group, effective nuclear charge decreases because outermost electrons are far away from the nucleus. Therefore electrons can be lost easily.
Hence, the metallic character increases down a group from top to bottom and decreases along a period as we move from left to right. $$Si$$ is a metalloid and $$P$$ is a non-metal. Hence, the order of increasing metallic character is:$$P < Si < Be < Mg < Na$$.
Question 5
1 / -0

Which of the following is not a merit of Mendeleev's periodic table?

A
It helped in correcting the atomic masses of some of the elements

B
He predicted the properties of some undiscovered elements and left gaps for them

C
He framed the periodic table with vertical and horizontal columns and gave shape to it

D
He gave separate places to isotopes in his periodic table

Solution

Merits of Mendeleev's periodic table:
1) It helped in correcting the atomic masses of some of the elements e.g. beryllium was corrected from 13.5 to 9. Similarly, indium, gold, platinum etc.
2) He predicted the properties of some undiscovered elements and left gaps for them e.g. Eka-boron, eka-aluminum and eka-silicon names were given for scandium, gallium, and germanium (not discovered at the time of Mendeleev).
3) He framed the periodic table with vertical and horizontal columns and gave shape to it.
4) Isotopes are the atoms of the same element having different atomic masses. Therefore, according to Mendeleev’s classification, these should be placed at different places depending upon their atomic masses. For example, hydrogen isotopes with atomic masses 1,2 and 3 should be placed at three places. However, isotopes have not been given separate places in the periodic table because of their similar properties.
Hence, option $$D$$ is correct.
Question 6
1 / -0

Mark the group which has maximum number of element in Mendeleev's periodic table:

A
$$I$$

B
$$II$$

C
$$III$$

D
$$IV$$

Solution
Question 7
1 / -0

The most important active step in the development of periodic table was taken by

A
Mendeleev

B
Dalton

C
Avogadro

D
Cavendish

Solution

The most important active step in the development of periodic table was taken by Mendeleev since though others have also made significant contributions towards classification of elements, he elevated the progress made in that direction much more than anyone else.
Hence Correct option is $$A$$.
Question 8
1 / -0

Element with atomic number $$35$$ belongs to:

A
$$3^{rd}$$ period

B
$$18^{th}$$ group

C
$$5^{th}$$ period

D
$$17^{th}$$ group

Solution

Element with atomic number $$35$$ is Bromine $$(Br)$$ and it belongs to group $$17$$ of the periodic table.
Question 9
1 / -0

Whose name is not associated with the development of periodic table?

A
Prout's

B
Newlands

C
Rutherford

D
Loother Meyer

Solution

William Prout discovered that the atomic mass of an element can never differ. He observed that many elements have atomic weights as multiple of that of hydrogen.
Newland and Lowther Meyer also played a great role in the attempts to classify the elements.
However, Rutherford played a prominent role in explaining the structure of the atom.
Therefore, the correct option is C.
Question 10
1 / -0

In which state C can show tetra valency ?

A
Ground state

B
Transition state

C
Excited state

D
All the above

Solution

The valency of carbon is four and in excited state it shows tetravalency which means it has tendency to form 4 bonds.
Hence, the correct option is $$C$$

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Periodic Classification of Elements Test - 27

Result

Periodic Classification of Elements Test - 27

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SHARING IS CARING

Question 1

$$300$$

$$175$$

$$125$$

$$150$$

Solution

Question 2

Johann Baeyer

Dmitri Mendeleev

Alfred Nobel

Johannes Van der Waals

Solution

Question 3

$$Li,\ Na$$

$$C,\ Si$$

$$Mg,\ Ca$$

$$Cl,\ Br$$

Solution

Question 4

$$P < Si < Na < Be < Mg$$

$$Be < Mg < P < Na < Si$$

$$Si < Be > Mg < Na < P$$

$$P < Si < Be < Mg < Na$$

Solution

Question 5

It helped in correcting the atomic masses of some of the elements

He predicted the properties of some undiscovered elements and left gaps for them

He framed the periodic table with vertical and horizontal columns and gave shape to it

He gave separate places to isotopes in his periodic table

Solution

Question 6

$$I$$

$$II$$

$$III$$

$$IV$$

Solution

Question 7

Mendeleev

Dalton

Avogadro

Cavendish

Solution

Question 8

$$3^{rd}$$ period

$$18^{th}$$ group

$$5^{th}$$ period

$$17^{th}$$ group

Solution

Question 9

Prout's

Newlands

Rutherford

Loother Meyer

Solution

Question 10

Ground state

Transition state

Excited state

All the above

Solution

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