Periodic Classification of Elements Test

Result

Periodic Classification of Elements Test - 25

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

What type of oxide would Eka-aluminium form?

A
$$EO_3$$

B
$$E_3O_2$$

C
$$E_2O_3$$

D
$$EO$$

Solution

Eka- Aluminium (E) forms oxide with the same chemical formula as Aluminium oxide. Thus, the formula can be represented as $${ E }_{ 2 }{ O }_{ 3 }$$.
Hence, option C is correct.
Question 2
1 / -0

The element with the atomic number $$9$$ resembles with the element having the atomic number:

A
$$8$$

B
$$17$$

C
$$36$$

D
$$27$$

Solution

Atomic number 9 has electronic configuration=2,7
Atomic number 17 has an electronic configuration=2,8,7.
So, both the elements belong to the same group i.e. halogens and have similar properties as they have the same number of valence electrons.
Question 3
1 / -0

The element in between lithium and potassium according to Dobereiner's classification is:

A
Mg

B
Na

C
Ca

D
Rb

Solution

Dobereiner's law of triads states that 'arithmetic mean of the atomic masses of first and the third element in the triad is approximately equal to the atomic mass of the second element in the triad.

The atomic mass of lithium is $$7$$ and Potassium is $$39$$. Their arithmetic mean comes out to be $$\dfrac {7+39}{2}= 23$$, which is the atomic mass of sodium $$(Na)$$.

Hence, the element in between lithium and potassium according to Dobereiner's classification is Na.
Question 4
1 / -0

Newlands assumed that only ______________ elements existed in nature.

A
108

B
48

C
32

D
56

Solution

Newlands had assumed that only 56 elements existed in nature and that no more elements were to be discovered. Later, several new elements were discovered.
Question 5
1 / -0

State true or false.
1. Position of isotopes was clearly defined in Mendeleev's periodic table.
2. Position of lanthanides and actinides was clearly defined in Mendeleev's periodic table.

A
True, True

B
True, False

C
False, True

D
False, False

Solution

Since Mendeleev's classification is based on atomic weights, the position of isotopes was not given. Lanthanides and Actinides were not known at that time. Their position has not been defined in the periodic table.
Hence, both statements are false.
Question 6
1 / -0

After the classification of elements study of elements become____________.

A
difficult

B
easy

C
both A and B

D
None of these

Solution

After the classification of elements study of elements become $$\text{easy}$$.
Classification of elements helps us to approach a systematic study of various elements found in nature without which it would be really difficult to study the properties of elements in a streamlined manner.
Question 7
1 / -0

Which of the following elements has the maximum number of outermost electrons?

A
Na

B
Mg

C
Si

D
P

Solution

Sodium has $$1$$ electron, magnesium has $$2$$ electrons, silicon has $$4$$ electrons, and phosphorous has $$5$$ electrons in its outermost shell. Therefore, phosphorous has the maximum number of electrons in its outermost shell.
Question 8
1 / -0

Which of the following is a defect in the Mendleev's periodic table?

A
Prediction of new elements

B
Doubtful atomic weights

C
Anomalous position of hydrogen

D
Non-systematic study of elements

Solution

The position of hydrogen was not right in the Mendleevs' periodic table. It was placed in $$I A$$. However, it resembles the elements of both $$IA$$(alkali metals) and group $$VII A$$ (halogens).
The position of hydrogen in the periodic table is not fixed but is anomalous.

Prediction of new elements, doubtful atomic weights, and non-systematic study of elements is the significance of Mendeleev's periodic table.

The correct option is $$C$$.
Question 9
1 / -0

In the periodic table, the elements having greater non-metallic character are placed at which corner of the periodic table?

A
Upper left

B
Center

C
Lower right

D
Lower left

E
Upper right

Solution

As shown in the image, metals occupy the left three-fourth of the periodic table, while non-metals except hydrogen are placed at the upper right corner of the periodic table.
The elements with the properties of both metals and non-metals are called metalloids(semi-metals).
Question 10
1 / -0

What is the valency of potassium with atomic number $$19$$?

A
$$0$$

B
$$1$$

C
$$2$$

D
$$3$$

Solution

The electronic configuration of potassium is $$2,\,8,\,8,\,1$$. The valence shell contains $$1$$ electron therefore the valency of potassium is $$1$$.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Periodic Classification of Elements Test - 25

Result

Periodic Classification of Elements Test - 25

Score

-

Rank

-

SHARING IS CARING

Question 1

$$EO_3$$

$$E_3O_2$$

$$E_2O_3$$

$$EO$$

Solution

Question 2

$$8$$

$$17$$

$$36$$

$$27$$

Solution

Question 3

Mg

Na

Ca

Rb

Solution

Question 4

108

48

32

56

Solution

Question 5

True, True

True, False

False, True

False, False

Solution

Question 6

difficult

easy

both A and B

None of these

Solution

Question 7

Na

Mg

Si

P

Solution

Question 8

Prediction of new elements

Doubtful atomic weights

Anomalous position of hydrogen

Non-systematic study of elements

Solution

Question 9

Upper left

Center

Lower right

Lower left

Upper right

Solution

Question 10

$$0$$

$$1$$

$$2$$

$$3$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.