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Mendeleev's periodic table, Modern table - Free MCQ Practice Test


MCQ Practice Test & Solutions: Test: Mendeleev's periodic table, Modern periodic table (20 Questions)

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Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 20

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Test: Mendeleev's periodic table, Modern periodic table - Question 1

Arrange the following in increasing order of ionic radii?

Detailed Solution: Question 1

All the given species are isoelectronic. In case of isoelectronic species ionic radii increases with increase in negative charge on anions.

Test: Mendeleev's periodic table, Modern periodic table - Question 2

The cause of periodicity of properties of elements is due to the repetition of similar:

Detailed Solution: Question 2

The cause of periodicity of properties of elements is due to the repetition of similar electronic configuration of their atoms in the outermost energy shell after certain regular interval.

Test: Mendeleev's periodic table, Modern periodic table - Question 3

Tendency of an atom in a molecule to attract the shared pair of electron towards itself is called:

Detailed Solution: Question 3

The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is called its electronegativity.
Electronegativity is a dimensionless property since it is only a tendency. It only indicates the net result of the tendencies of different elements to attract the bond forming electron pair.

Test: Mendeleev's periodic table, Modern periodic table - Question 4

Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken?

Detailed Solution: Question 4

Mulliken suggested that EN of an element is the average of its IP and EA.

Test: Mendeleev's periodic table, Modern periodic table - Question 5

(X), (Y), (Z) are elements of the third period. Oxide of (X) is ionic, that of (Y) is amphoteric and of (Z) a giant molecule. (X), (Y) and (Z) will have atomic numbers in the order

Detailed Solution: Question 5

For third period, "s" block will form ionic oxide, 13th group forms amphoteric oxide, and 14th group element will form giant oxide .
(X) < (Y) < (Z)

Test: Mendeleev's periodic table, Modern periodic table - Question 6

Which one of the following is correct order of second ionisation potential of   and ?

Detailed Solution: Question 6

The electronic configuration of Na,Ne,Mg and Al after the removal of an electron is as

The ionisation energy decreases as the size of the atom/ion increases. Further ionisation energy increases with increase in nuclear charge.
Since, Na+ gives a stable electronic configuration hence its IE2 is highest among the given species and therefore the correct order of their IE2 is
Mg < Al < Ne < Na

Test: Mendeleev's periodic table, Modern periodic table - Question 7

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for and

Detailed Solution: Question 7

As the nuclear charge increases, the force of attraction between the nucleus and the incoming electron increases and hence the elecron gain enthalpy becomes more negative, hence the correct order is

Test: Mendeleev's periodic table, Modern periodic table - Question 8

The maximum covalency and highest oxidation state possible for an element with Z = 13 are respectively.

Detailed Solution: Question 8

Electronic configuration of 
The maximum covalency of any element is found by counting the number of covalent and coordinate bonds that it can form.
So, the maximum covalency of element having is 6.
Since, it has 3 electrons in the valence shell, its highest oxidation state is +3.

Test: Mendeleev's periodic table, Modern periodic table - Question 9

Sum of first three ionization energies of is atom and the sum of first two ionization energies of is atom . Out of Al(III) and

Detailed Solution: Question 9

Ionization energy is not the only the criteria for the stability of an oxidation state.

Test: Mendeleev's periodic table, Modern periodic table - Question 10

The correct order of decreasing electronegatıvity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium is

Detailed Solution: Question 10

Electronegativity values of given elements are as follows:

Test: Mendeleev's periodic table, Modern periodic table - Question 11

Which of the following sequence correctly represents the decreasing acidic nature of oxides?

Detailed Solution: Question 11

On passing from left to right in a period, acidic character of the normal oxides of the elements increases with increase in electronegativity.

Test: Mendeleev's periodic table, Modern periodic table - Question 12

Correct order of first IP among following elements Be,B,C,N,O is

Detailed Solution: Question 12



IP increases along the period. But IP of . Further IP of because atoms with fully or partly filled orbitals are most stable and hence have high ionisation energy.

Test: Mendeleev's periodic table, Modern periodic table - Question 13

Aqueous solutions of two compounds and are prepared in two different beakers. If, the electronegativity of , and then the nature of two solutions will be respectively :

Detailed Solution: Question 13

The electronegativity difference between and is , which indicates bond will be covalent, since bond having more ionic character thus bond will break and ions gets release and acidic solution is formed and whereas difference between electronegativity of is , thus, bond will break. Hence, solution will be basic in nature.

Test: Mendeleev's periodic table, Modern periodic table - Question 14

An element having electronic configuration forms

Detailed Solution: Question 14

It is electronic configuration of alkali metal. Hence it will form basic oxide.

Test: Mendeleev's periodic table, Modern periodic table - Question 15

The correct order of first ionisation enthalpy of group-13 elements is

Detailed Solution: Question 15

The first ionization enthalpy generally decreases down the group in Group 13 of the periodic table due to the increasing atomic size, which leads to easier removal of the outermost electron. So, the order B > Ga > Tl follows this trend.

Test: Mendeleev's periodic table, Modern periodic table - Question 16

Which one of the following statements is incorrect in relation to ionisation enthalpy?

Detailed Solution: Question 16

As the value of increases, the nuclear attraction over the outermost shell decreases, therefore removal of an electron will be easier.

Test: Mendeleev's periodic table, Modern periodic table - Question 17

If the ionization enthalpy and electron gain enthalpy of an element are 275 and respectively, then the electronegativity of the elementon the Pauling scale is:

Detailed Solution: Question 17

I.E. E.A.

Electronegativity

Test: Mendeleev's periodic table, Modern periodic table - Question 18

The electronegativity order of the following elements is

Detailed Solution: Question 18

Electronegativity is inversely proportional to the atomic size. Smaller the size, greater is the electronegativity. Nitrogen is placed in second period, so it has smallest size and highest electronegativity. Then, iodine belongs to halogen family which are electronegative elements. For, S and Te, on moving top to bottom, atomic size increases so electronegative character decreases. So, the correct order is .

Test: Mendeleev's periodic table, Modern periodic table - Question 19

The successive ionization energy values of an element are and respectively. The element is likely to be:

Detailed Solution: Question 19

The and of an element are and respectively. Therefore, We can see that there is a regular very close increment of ionization energy till the fourth ionization energy. After the fourth ionization energy, there is a sudden high jump in energy. It confirms that after losing four electrons, that element will achieve the noble gas configuration or stable configuration.

We can see the configuration of the elements and can identify that silicon has this tendency to lose the four electrons and gets the noble gas configuration.

the valency of the element is and it is most likely to be silicon.

Test: Mendeleev's periodic table, Modern periodic table - Question 20

Under normal condition which of the following electronic configuration is able to form dipositive ion

Detailed Solution: Question 20

has only two electrons in the 3 s-orbital and hence its . is lowest, i.e. it has the maximum tendency to from di-positive ions.

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