WBJEE 2025 Inorganic Chemistry Practice Questions with Solutions: Inorganic Chemistry is not only an important chapter for school students but the topic also establishes the fundamentals of Chemistry and is important for the state-level engineering entrance exams such as the WBJEE 2025 exam. Therefore, besides studying from the WBCHSE 11th and 12th standard books, you should make it a habit to solve WBJEE 2025 Inorganic Chemistry practice questions during exam preparation.  The questions asked in this section are usually based on the Properties of Elements, the Periodic Table, and Chemical Bonds. You should pay special attention to this chapter while preparing for the upcoming exam as at least 8-10 questions are expected from here. If you look at the WBJEE Inorganic Chemistry sample questions from the previous years, you will see that a good number of questions were often asked about Atoms and Molecules, Electronic Configuration, and so on. In this article, we will discuss the importance of Inorganic Chemistry as part of the WBJEE 2025 syllabus PDF along with some of the important WBJEE 2025 Inorganic Chemistry practice questions with solutions.

Also Check - WBJEE 2025 Organic Chemistry Practice Questions with Solutions

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List of WBJEE 2025 Inorganic Chemistry Sub Topics for Exam Preparations

The following are some of the key topics from the Inorganic Chemistry chapter of the WBJEE 2025 Chemistry syllabus PDF. While solving with WBJEE 2025 Inorganic Chemistry practice questions, make sure you cover these sub topics diligently. 

The marks weightage for Inorganic Chemistry gives you a brief idea of the maximum marks expected to score from this chapter. The marks weightage can be determined by the past years' exam papers. Inorganic chemistry has a significant marks weightage up to 6-7% in the WBJEE exam covering several important topics. Let's have a closer look at the WBJEE 2025 Inorganic Chemistry marks weightage from the table below. 

WBJEE 2025 Inorganic Chemistry Practice Questions with Solutions

The following are some of the most competitive practice questions for the WBJEE 2025 Inorganic Chemistry section. Our experts have compiled these after reviewing the previous years' question papers. We highly recommend you go through the solutions along with the questions so that you know how to approach each question differently. With a strong hold on the WBJEE Inorganic Chemistry sample questions, you can score 10-15 marks in Paper II. 

Check out the most expected WBJEE 2025 Inorganic Chemistry practice questions with solutions here. 

Q1. 4f² electronic configuration is found in:

a. Pr

b. Pr³⁺

c. Nd³⁺

d. Pm³⁺

Ans: b. Pr³⁺

Solution: 

Let's consider the elements:

Pr (Praseodymium) has an atomic number of 59 and a ground-state electron configuration of [Xe]4f³6s².

Pr³⁺ (Praseodymium ion) will lose 3 electrons. It loses the two 6s electrons and one from the 4f orbital. So, the configuration is [Xe]4f².

Nd³⁺ Neodymium ion) with an atomic number of 60, in its ground state, has the configuration [Xe] 4f⁴6s². When it loses 3 electrons (two from 6s and one from 4f), its configuration is [Xe] 4f³.

Pm³⁺ (Promethium ion) with an atomic number of 61, in its ground state, it has the configuration [Xe] 4f⁵6s². When it loses 3 electrons (two from 6s and one from 4f), its configuration is [Xe] 4f⁴.

So, the 4f² electronic configuration is found in Pr³⁺. Therefore, option b is correct. 

Q2. Suppose a gaseous mixture of He, Ne, Ar, and Kr is treated with photons of the frequency appropriate to ionize Ar. What ion(s) will be present in the mixture?

a. Ar⁺

b. Ar⁺ + Kr⁺

c. Ar⁺ + He⁺ + Ne⁺

d. He⁺ + Ar⁺ + Kr⁺

Ans: b. Ar⁺ + Kr⁺

Solution:

The order of ionization energy of given elements is He > Ne > Ar > Kr. Since the energy of a photon is sufficient to ionize both Ar and Kr. Therefore, the mixture contains Ar+ + Kr+. 

Q3. The correct pair of electron affinity order is:

a. O>S, F>Cl

b. O<S, Cl>F

c. S>O, F>Cl

d. S<O, Cl>F

Ans: b. O<S, Cl>F

Solution:

Electron affinity of S > O and Cl > F. This is so because of the small size of oxygen and fluorine (in respective case), due to which they got higher charge density and thus electronic repulsion increases when a new electron is added.

Q4. 5.75 mg of sodium vapor is converted to sodium ion. If the ionization energy of sodium is 490 kJ mol^-1 and its atomic weight is 23 units, the amount of energy needed for this conversion will be:

a. 1.96 kJ

b. 1960 kJ

c. 122.5 kJ

d. 0.1225 kJ

Ans: d. 0.1225 kJ

Solution: 

IE_Na = 490 kJ/mol

Number of moles of Sodium(Na) presents,

IE_Na = 490 kJ/mol

Number of moles of Sodium(Na) present,

η_Na = m_Na(g)/M_Na

= 5.75 x 10^-3/23

IE_Na = 0.1225 kJ

Q5. Which of the following contains a maximum number of lone pairs on the central atom?

a. CIO₃^-

b. XeF₄

c. SF₄

d. I₃^-

Ans: d. I₃^-

Q6. The molecular shapes of SF₄, CF₄, and XwF₄ are:

a. The same with 2, 0, and 1 lone pairs of electrons on the central atoms, respectively

b. The same with 1, 1, and 1 lone pairs of electrons on the central atoms, respectively

c. Different with 0, 1, and 2 lone pairs of electrons on the central atoms, respectively

d. Different with 1, 0, and 2 lone pairs of electrons on the central atoms, respectively

Ans: d. Different with 1, 0, and 2 lone pairs of electrons on the central atoms, respectively

Q7. The species in which the nitrogen atom is in a state of sp hybridization is:

a. NO₃^-

b. NO₂

c. NO₂⁺

d. N0₂^-

Ans: c. NO₂⁺

Solution: 

Among the given options NO₂⁺ has nitrogen in sp-hybridization

Number of electronic lobes

= 2 + 1/2[5-4-1]

= 2 (Bond pairs) + 0 (Lone pairs)

Thus NO₂⁺ has sp-hybridization

Q8. In the Bayer's process, the leaching of alumina is done by using:

a. Na₂CO₃

b. NaOH

c. SiO₂

d. CaO

Ans: b. NaOH

Q9. How many P - O - P linkages are there in P₄O₁₀?

a. Six

b. Four

c. Five

d. One

Ans: a. Six

Q10. The calculated spin-only magnetic moment values in BM for [FeCl₄]^- and [Fe(CN)₆]^3- are:

a. 5.9 BM, 1.732 BM

b. 4.89 BM, 1732 BM

c. 3.87 BM, 1.732 BM

d. 1.732 BM, 2.82 BM

Ans: a. 5.9 BM, 1.732 BM

Quick Links: In addition to solving WBJEE 2025 Inorganic Chemistry practice questions, you should also attempt chapter-wise WBJEE 2025 mock test at least twice or thrice a week particularly during the last phase of your exam preparation. This will give you a boost in confidence and also help you time yourself while solving the questions, thus increasing efficiency and speed. 

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