Periodic Classification of Elements Test

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Periodic Classification of Elements Test - 18

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Weekly Quiz Competition

Question 1
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Which of the following statements about Mendeleev's Periodic Table is incorrect?

A
He left gaps for some elements which were discovered later and correctly predicted the properties of them.

B
Inert gases could be placed in a new group without disturbing the existing order.

C
He arranged the elements according to the properties of elements.

D
The properties of the elements are the periodic function of their atomic numbers.

Solution

Mendeleev arranged the elements in order of their atomic masses while taking chemical properties into consideration. He left gaps predicting that some elements will be discovered later. When inert gases were discovered, they could be placed in a new group without disturbing his existing table.
Question 2
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Which of the following element(s) was/were not known when Mendeleev gave his classification?

A
Germanium

B
Gallium

C
Scandium

D
All of the above

Solution

The elements which were unknown when Mendeleev gave his classification were Geranium, Gallium and Scandium. He left gaps for the unknown elements and predicted correctly the properties of some of the unknown elements.
Question 3
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Eka-aluminium forms chloride of the type :

A
$$E_2Cl$$

B
$$ECl_3$$

C
$$E_2Cl_3$$

D
$$E_3Cl_4$$

Solution

The properties of Eka-aluminium, proposed by Mendeléev, are similar to that of gallium, so it forms chloride of the type $$ECl_3$$ same as $$GaCl_3$$.
Question 4
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An element with electronic configuration $$2,\,8,\,2$$ belongs to which period and group?

A
$$2,\,3$$

B
$$4,\,3$$

C
$$2,\,1$$

D
$$3,\,2$$

Solution

Element with electronic configuration $$2,\,8,\,2$$ belongs to $$3rd$$ period and $$2nd$$ group. The valence electrons give us the idea of group numbers. As the electrons are divided into $$3$$ different shell therefore the period number is $$3$$.
Question 5
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The groups from $$1^{st}$$ to $$7^{th}$$ of Mendeleev's periodic table were divided into ______ subgroups.

A
$$2$$

B
$$3$$

C
$$4$$

D
$$1$$

Solution

The groups from $$1$$st to $$7$$th of Mendeleev's periodic table were divided into two subgroups A and B.
Question 6
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Mendeleev used a Sanskrit numeral before the names of the predicted elements. What was the term used for it?

A
Sasi

B
Eka

C
Astan

D
Pancan

Solution

A Sanskrit numeral used before the names of the predicted elements was Eka which means one.
Question 7
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Which of the following element has only one valence electron?

A
Oxygen

B
Lithium

C
Bromine

D
Argon

E
Arsenic

Solution

The element lithium has only one valence electron. Oxygen, bromine, argon, and arsenic have 2, 7, 8, and 15 valence electrons respectively.
Question 8
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The electronic configuration of calcium is $$2,\,8,\,8,\,2$$. Find the valency of the element.

A
$$8$$

B
$$2$$

C
$$6$$

D
$$4$$

Solution

The valency of a group 2 element is decided by the number of valence electrons. Here, the number of valence electrons is $$2$$. Therefore, the valency is $$2$$.
Question 9
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Which of the following elements will form an acidic oxide?

A
An element with atomic number $$7$$

B
An element with atomic number $$3$$

C
An element with atomic number $$12$$

D
An element with atomic number $$19$$

Solution

Non-metals usually forms acidic oxide. From the option, non-metal is one which has atomic number $$7$$ which is nitrogen.

Hence, the correct option is $$\text{A}$$
Question 10
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Carbon : Non-metal : : Germanium :

A
Metal

B
Non-metal

C
Metalloid

D
None of these

Solution

Carbon is a non-metal found in the periodic table. As for germanium, it is neither a metal nor a non-metal. Instead it is a metalloid.
Carbon : Non-metal : : Germanium : Metalloid

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Periodic Classification of Elements Test - 18

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Periodic Classification of Elements Test - 18

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Question 1

He left gaps for some elements which were discovered later and correctly predicted the properties of them.

Inert gases could be placed in a new group without disturbing the existing order.

He arranged the elements according to the properties of elements.

The properties of the elements are the periodic function of their atomic numbers.

Solution

Question 2

Germanium

Gallium

Scandium

All of the above

Solution

Question 3

$$E_2Cl$$

$$ECl_3$$

$$E_2Cl_3$$

$$E_3Cl_4$$

Solution

Question 4

$$2,\,3$$

$$4,\,3$$

$$2,\,1$$

$$3,\,2$$

Solution

Question 5

$$2$$

$$3$$

$$4$$

$$1$$

Solution

Question 6

Sasi

Eka

Astan

Pancan

Solution

Question 7

Oxygen

Lithium

Bromine

Argon

Arsenic

Solution

Question 8

$$8$$

$$2$$

$$6$$

$$4$$

Solution

Question 9

An element with atomic number $$7$$

An element with atomic number $$3$$

An element with atomic number $$12$$

An element with atomic number $$19$$

Solution

Question 10

Metal

Non-metal

Metalloid

None of these

Solution

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