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# Important Questions (1 mark): Periodic Classification of Elements (Easy)

## 21 Questions MCQ Test Science Class 10 | Important Questions (1 mark): Periodic Classification of Elements (Easy)

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This mock test of Important Questions (1 mark): Periodic Classification of Elements (Easy) for Class 10 helps you for every Class 10 entrance exam. This contains 21 Multiple Choice Questions for Class 10 Important Questions (1 mark): Periodic Classification of Elements (Easy) (mcq) to study with solutions a complete question bank. The solved questions answers in this Important Questions (1 mark): Periodic Classification of Elements (Easy) quiz give you a good mix of easy questions and tough questions. Class 10 students definitely take this Important Questions (1 mark): Periodic Classification of Elements (Easy) exercise for a better result in the exam. You can find other Important Questions (1 mark): Periodic Classification of Elements (Easy) extra questions, long questions & short questions for Class 10 on EduRev as well by searching above.
QUESTION: 1

### The nuclear charge of Li is:

Solution: As we know, an atomic number of Li is 3. So it contains 3 protons in the nucleus, So it nuclear charge is 3.

QUESTION: 2

Solution:
QUESTION: 3

### With an increase in temperature by 10k ,the rate of reaction becomes double. How many times the rate of reaction will be, if the temperature is increased from 303 k to 353 k ?

Solution:
QUESTION: 4

Name the element that first shows some visible metallic properties at room temperature.

Solution: The high ionization energy makes the element appear non-metallic while Iodine and astatine having low ionization energy display metallic properties and Iodine was the first element to show some physical properties of metals.

QUESTION: 5

The properties of_________were predicted by Mendeleev before their isolation.

Solution: Mendeleev has the foresight to leave some gaps in the periodic table for 3 elements and these elements are discovered later and included in the table.

QUESTION: 6

The number of elements known in Mendeleev's presented periodic table is:

Solution:
QUESTION: 7

The law of triads is not applicable to:

Solution: The law of triads does not apply to Ru, Rh, Pt.

QUESTION: 8

Lanthanides belong to which period?

Solution: Lanthanides belong to 6th period.They start from atomic number 58 and ends in 71

QUESTION: 9

The elements in the_______group have________chemical properties.

Solution:

All the elements of a group have similar chemical properties because they have same number of valence electrons in their outemost shell

QUESTION: 10

In Mendeleev's periodic table,the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.69 amu.Reason for the same is that:

Solution: According to Mendeleev's 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.

QUESTION: 11

The law of triads was given by:

Solution:

In the year 1829, Johann Wolfgang Dobereiner,a German scientist, was the first to classify elements into groups based on John Dalton's assertions. He grouped the elements with similar chemical properties into clusters of three called 'Triads'. The distinctive feature of a triad was the atomic mass of the middle element.When elements were arranged inorder of their increasing atomic mass,the atomic mass of the middle element was approximately the arithmetic mean of the other two elements of the triad.

QUESTION: 12

In order to fit elements into his table, Newlands adjusted two elements in the same slot, but also put some unlike elements in the same slot.

Solution:

For example, cobalt and nickel were in the same slot and these were placed in the same column as fluorine, chlorine and bromine which have very different properties than these elements. Iron,which resembles cobalt and nickel in properties,had been placed far away from these elements.

QUESTION: 13

Mendeleev examined the relationship between_________and______for classification of elements.

Solution:
QUESTION: 14

Pair of element shaving same number of valence electrons is:

Solution:
QUESTION: 15

How many periods were there in Mendeleev's periodic table?

Solution:
QUESTION: 16

What were the limitations of Mendeleev's periodic table?

Solution:
QUESTION: 17

Law of Triad was proposed by

Solution:
QUESTION: 18

Which of the following statements can help a chemistry student to predict chemical properties of an element?

(I) Position of element in the periodic table

(II) Atomic number of the element

(III) Number of shells in the atom

(IV) Number of electrons in the outermost shell.

Solution: To predict chemical properties of an element.

QUESTION: 19

If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is:

Solution: According to Dobereiner, the atomic mass of the middle element was nearly equal to the arithmetic mean of the other two.Therefore,the atomic mass of the third element is which is nearly equal to the atomic mass of arsenic.
QUESTION: 20

_________were not included in Mendeleev's periodic table.

Solution: There were many demerits in the Mendeleev periodic table,such as,isotopes were not included in his periodic table as the isotopes were discovered long after this discovery..

QUESTION: 21

Whose name is not associated with the development of periodic Table

Solution: