Question 1

Which is not similar characteristic(s) about the electronic configuration of Be, Mg, Ca?

Accepted Answer

(b) All the atoms contain a pair of p-electrons in their outermost energy level

Question 2

The elements with atomic number 117 and 120 are yet to be discovered. In which group would you place these elements when discovered ?

Accepted Answer

(a) The elements with atomic number 117 and 120 are placed in the 17th and 2nd group respectively.

Question 3

The most electropositive element possesses the electronic configuration :

Accepted Answer

(c) Cesium is most electropositive element possesses the electronic configuration  [Xe]6s1

Question 4

Which one of the following elements shows both positive and negative oxidation states?

Accepted Answer

(c) Iodine
The atomic size of Iodine is very big and it has empty d orbitals to expand it's electron in s and p orbitals In 3 rd
  excited state iodine has 7 unpaired electrons so it can show positive oxidation state with higher electronegative element like Cl,Br,F. Generally all halogens exhibit negative oxidation state due to their electronegativity.

Question 5

The number of elements present in fifth period is :

Accepted Answer

(a) 18
The fifth period starts with Rb(37) to Xe(54). Therefore, a total of 18 elements.

Question 6

Which of the following arrangements shows the correct order of decreasing paramagnetism?

Accepted Answer

(b) N>O>Al>Ca
Paramagnetism directly proportional to unpaired electron

Question 7

The outer electronic structure of lawrencium (atomic number 103) is :

Accepted Answer

(d) Rn5f146d17s2

Question 8

The elements with the lowest atomic number that has a ground state electronic configuration of (n−1)d6ns2 is located in the :

Accepted Answer

(c) fourth period

Question 9

Which of the following sets of atomic numbers corresponds to elements of group 16 ?

Accepted Answer

(c) 8,16,34,52
The atomic numbers : 8,16,34,50 are Oxygen, Sulphur, Selenium and Tellurium respectively.

Question 10

The atomic numbers of the metallic and non-metallic elements which are liquid at room temperature respectively are :

Accepted Answer

(d) 80,35
The atomic numbers of the metallic and non-metallic elements which are liquid at room temperature respectively are Hg and Br

Question 11

In the periodic table, metallic character of the elements shows one of the following trend :

Accepted Answer

(b) Increases down the group and decreases across the period

Question 12

Nucleus of an element contains 9 protons. It's valency would be :

Accepted Answer

(a) 1
As nucleus of the element contains nine protons, its atomic number is 9. Hence, the electronic configuration of the element is 2, 7. It needs one more electron to attain the stable inert gas configuration. Hence, its valency is 1.

Question 13

Transition metals are not characterized by :

Accepted Answer

(a) fixed valency

Question 14

Sodium generally does not shown oxidation state of +2, because of its:

Accepted Answer

(b) High second ionization potential

Question 15

Which of the following pairs of molecules have the almost identical bond dissociation energy?

Accepted Answer

(c) F2​ and I2​
The atomic radius of F atom is so small that the electrostatic repulsion between nuclei is significant and non-bonding electrons of F atoms repel each other. As a result F−F bond energy is almost identical with bond energy of I−I which is weaker due to formation of bond by sp orbital of I atom.

Question 16

According to modern periodic law the properties of elements repeat at regular intervals when the elements are arranged in order of :

Accepted Answer

(c) increasing atomic number

Question 17

Give the symbol of the elements of lowest atomic number that has three 2p electrons:

Accepted Answer

(c) N

Question 18

In the fourth period of the periodic table, how many elements have one or more 4d electrons?

Accepted Answer

(c) 0
In fourth period of periodic table, There is no element having one or more 4d electron.

Question 19

Assuming that elements are formed to complete the seventh period, what would be the atomic number of the alkaline earth metal of the eighth period?

Accepted Answer

7th period ends in 118Hence the alkaline earth metal shall belong to the second group, thus its atomic number would be: 120

Question 20

Which of the following represents an excited state of an atom?

Accepted Answer

(d) 1s22s22p53s1

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Solutions for Problems in Inorganic Chemistry for JEE Main & Advanced by V.K. Jaiswal

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