p & s- Block Element JEE Main Questions 2025 hold a weightage of 9.9% in the exam which is equivalent to 2 to 3 questions. The important topics from the p & s- Block chapter are General Properties, Reactions and Compounds, Group 13: Boron Family, Group 14: Carbon Family, etc. Candidates need to prioritise p & s- Block Element chapter from JEE Main Syllabus 2025 as it is crucial and every year around 10 to 12 marks are asked. Therefore candidates must possess a strong JEE Main 2025 Preparation Strategies to score well in the exams. It is recommended that every aspirant preparing for JEE Main 2025 January and April sessions should practice the previous years' questions along with the sample questions to get a strong foundation of the topic. In this article, candidates will get a detailed idea of the Important Practice Questions with PYQs related to p & s- Block Element topic of JEE Main Chemistry section.
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p & s- Block Element JEE Main Questions 2025 PDF
The table below contains the JEE Main Questions 2025 PDF from p & s- Block Element topic.
Practice p & s- Block Element JEE Main Questions 2025
1. The correct statement for the molecule, CsI3, is :
(1) it contains Cs3+ and I– ions
(2) it contains Cs+, I– and lattice I2 molecule
(3) it is a covalent molecule
(4) it contains Cs+ and I3– ions.
Solution:
CsI3 -> Cs+ + I3–
CsI3 contains Cs+ and I3–.
Hence option (4) is the answer.
Also Read:
JEE Main 2025 Preparation and Study Time Table for 60 Days (2 Months)
2. Which of the following statements about Na2O2 is not correct?
(1) Na2O2 oxidises Cr3+ to CrO42- in acid medium
(2) It is diamagnetic in nature
(3) It is the superoxide of sodium
(4) It is a derivative of H2O2
Solution:
Na2O2 is sodium peroxide. It is not superoxide.
Hence option (3) is the answer.
3. The metal that cannot be obtained by electrolysis of an aqueous solution of its salt is
1) Cr
2) Ag
3) Ca
4) Cu
Solution:
Ca cannot be obtained by the electrolysis of an aqueous solution of its salt.
Hence option (3) is the answer.
4. Based on lattice energy and other considerations, which one of the following alkali metal chlorides is expected to have the highest melting point?
(1) RbCl
(2) LiCl
(3) KCl
(4) NaCl
Solution:
NaCl has the highest lattice energy and thus the highest melting point.
Hence option (4) is the answer.
5. A metal M on heating in nitrogen gas gives Y. Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour, Y is :
(1) NH3
(2) MgO
(3) Mg3N2
(4) Mg(NO3)2
Solution:
Magnesium, when heated with nitrogen, forms magnesium nitride.
3Mg + N2 → Mg3N2
Magnesium nitride reacts with water to form ammonia and magnesium hydroxide.
Mg3N2 → Mg(OH)2 + NH3
When ammonia gas is passed through CuSO4 solution, a blue colour is obtained.
Hence option (3) is the answer.
6. Which one of the following will react most vigorously with water?
(1) Li
(2) K
(3) Rb
(4) Na
Solution:
The reactivity of s-block elements increases down a group. So Rubidium will react most vigorously with water.
Hence option (3) is the answer.
7. The hydrogen bomb is based on the principle of
(1) Nuclear fission
(2) Natural radioactivity
(3) Nuclear fusion
(4) Artificial radioactivity
Solution:
Hydrogen bomb is based on the fusion of isotopes of hydrogen.
Hence option (3) is the answer.
8. Amongst LiCl, RbCl, BeCl2 and MgCl2 the compounds with the greatest and the least ionic character, respectively are :
(1) RbCl and MgCl2
(2) LiCl and RbCl
(3) MgCl2 and BeCl2
(4) RbCl and BeCl2
Solution:
Because of the smallest cationic size, BeCl2 is the least ionic. Rb+ has the biggest ionic size. So it has the greatest ionic character.
Hence option (4) is the answer.
9. In curing cement plasters water is sprinkled from time to time. This helps in
(1) developing interlocking needle-like crystals of hydrated silicates.
(2) hydrating sand and gravel mixed with cement
(3) converting sand into silicic acid
(4) keeping it cool
Solution:
During the hydration of calcium aluminosilicates, cross-links are developed
Hence option (1) is the answer.
10. K0₂ (potassium superoxide) is used in oxygen cylinders in space and submarines. This is because it
(1) absorbs C02 and increases 02 content
(2) eliminates moisture
(3) absorbs C02
(4) produces ozone
Solution:
2KO, + 2H20 —> 2KOH + H202 + 02. It eliminates moisture.
Hence option (2) is the answer.
11. A metal M readily forms its sulphate MS04 which is water soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hydroxide M(OH)2 which is soluble in NaOH solution. Then M is
(1) Mg
(2) Ba
(3) Ca
(4) Be
Solution:
Because of its small size, Beryllium shows anomalous properties with alkaline earth metals.
Hence option (4) is the answer.
12. The substance not likely to contain CaC03 is
(1) calcined gypsum
(2) sea shells
(3) dolomite
(4) a marble statue
Solution:
The composition of gypsum is CaS04. 2H20.
Hence option (1) is the answer.
13. Several blocks of magnesium are fixed to the bottom of a ship to
(1) make the ship lighter
(2) prevent the action of water and salt
(3) prevent puncturing by under-sea rocks
(4) keep away the sharks
Solution:
Magnesium provides cathodic protection and prevents corrosion.
Hence option (2) is the answer.
14. The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be
1) -2.55 eV
2) -5.1 eV
3)-10.2 eV
4) +2.55 eV
Solution:
The ionisation potential of an alkali metal atom and the electron affinity of its monovalent cation are the same in magnitude but with opposite signs.
Hence option (2) is the answer.
15. In Zeolites and synthetic resin method, which will be more efficient in removing permanent hardness of water.
(1) Synthetic resin method as it exchanges only cation.
(2) zeolite resin method as it exchanges only cation.
(3) Synthetic resin method as it exchanges only anion.
(4) Synthetic resin is harmful to nature.
Solution:
The synthetic resin method will be more efficient in removing the permanent hardness of water because it exchanges only cation.
Hence option (1) is the answer.
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FAQs
The JEE Main exam incorporates various question types, comprising multiple-choice questions (MCQs), numerical value-based questions, as well as drawing-based questions. With MCQs, candidates must select the correct answer from the given options.
No. The JEE Mains exam alone is not enough for securing admission into an IIT. JEE Advanced is the crucial examination required for IIT admissions, and candidates are required to qualify in the JEE Main exam to be eligible for the JEE Advanced exam.
Yes, 90 is considered to be a good percentile in the JEE Main 2025 entrance exam. Candidates can secure admission into NITs, IITs or IISc Bangalore if they score a rank between 1,00,000 and 1,50,000 with a 90 percentile in the JEE Main exam.
Mathematics is often considered to be the most challenging subject in the JEE Main exam, but its difficulty level varies from person to person. Some students may find other subjects more challenging based upon their strengths and weaknesses.
NCERT books are very important to prepare for the JEE Main 2025 exam. The JEE Main exam follows the CBSE syllabus for 11th and 12th classes, so NCERT books are considered to be the most reliable and necessary study materials. NCERT books explain basic fundamental concepts in a simple and clear way.
To score a 99+ percentile in the JEE Main 2025 exam, candidates require more than just knowing the JEE Main syllabus, as it required consistent practice, strategic revision, time management, and the ability to solve complex problems under pressure. However, with the appropriate resources, one can achieve these requirements.
All sections namely Mathematics, Physics, and Chemistry are mandatory in the JEE Main exam, with questions covering the entire JEE Main syllabus. To be eligible for admission, candidates must achieve the minimum qualifying marks in each subject and the overall aggregate.
Candidates can study from the NCERT textbooks of class 11 and 12 Physics, Chemistry and Mathematics to cover the JEE Mains syllabus. No changes have been made to the JEE Main Syllabus 2025. NTA removed several topics of Physics, Chemistry and Mathematics last year from the JEE Main syllabus.
Candidates must keep in mind that there is no requirement of 75% marks in class 12 for appearing in the JEE Mains exam. The JEE Main eligibility criteria of minimum 75% marks in class 12 is required at the time of securing admission across NITs, IIITs and GFTIs. Candidates can apply and appear in the JEE Mains 2025 exam irrespective of their class 12 marks.
Previous year question papers are an important source for the JEE Main preparations. However, relying solely upon PYQs is not enough to fully prepare for the JEE Mains exam. Candidates must also focus on covering the entire syllabus, developing strong conceptual understanding, practising time management, and attempting mock tests.
S Block elements are the ones that are located in Columns 1 and 2 of the periodic table, plus helium. Some examples of s block elements are Alkali metals (group 1) and alkaline earth metals (group 2). They are Soft, shiny, low density, good conductors of heat and electricity, low melting and boiling points.
P Block elements are the ones that are located in columns 13–18 of the periodic table. Examples of P block elements in jee mains are Boron, carbon, nitrogen, chalcogens, halogens, and noble gases. They consist of metals, nonmetals, and metalloids.
S-block and p-block elements are groups of elements in the periodic table that are named for the shape of their valence electrons' orbitals. S-block elements are in the left columns of the periodic table, while p-block elements are in the right columns.
The important topics from the p & s- Block chapter are General Properties, Reactions and Compounds, Group 13: Boron Family, Group 14: Carbon Family, etc.
p & s- Block Element JEE Main Questions 2025 hold a weightage of 9.9% in the exam which is equivalent to 2 to 3 questions.
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