CBSE Class 10th science term 1 board exam: Important 20 assertion reason questions and answers for tomorrow’s exam
Tomorrow is the CBSE Science exam and to make it easier for you all who studies at the last moment, we’ve compiled 20 important assertion reason based questions that can help you top your exam.
Preparing for exams from the beginning of the session is not what students really do and they only study when the tensions of board exams hit them. Then you all know, instead of studying the chapters thoroughly, students look for important questions and answers so that they can prepare themselves with the best.
Not to worry, we are your saviours for tomorrow’s exam. As you all know CBSE is conducting class 10th board exams term 1. The board examination conducted the first exam for class 10th i.e. Social Science yesterday.
Tomorrow is the Science exam and to make it easier for you all who studies at the last moment, we’ve compiled 20 important assertion reason based questions from chapter 1 that can help you top your exam.
Chapter 1 – Chemical Reactions And Equations
In the following questions, a statement of assertion (A) is followed by a statement of the reason (R). Mark the correct choice as:
a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Assertion (A): Decomposition of vegetable matter into compost is an example of exothermic reactions.
Reason (R): Exothermic reactions are those reactions in which heat is evolved.
2. Assertion (A): When HCl is added to zinc granules, a chemical reaction occurs.
Reason (R): The evolution of a gas and change in colour indicate that the chemical reaction is taking place.
3. Assertion (A): Calcium carbonate when heated gives calcium oxide and water.
Reason (R): On heating calcium carbonate, a decomposition reaction takes place.
4. Assertion (A): Brown fumes are produced when lead nitrate is heated.
Reason (R): Nitrogen dioxide gas is produced as a by-product due to the decomposition of lead nitrate.
5. Assertion (A): White silver chloride turns grey in sunlight.
Reason (R): Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.
6. Assertion (A): Pungent smelling gas is produced when sulphur burns in the air.
Reason (R): Sulphur trioxide is formed on reaction of sulphur with oxygen.
7. Assertion (A): In a reaction of copper with oxygen, copper serves as a reducing agent.
Reason (R): The substance which gains oxygen in a chemical reaction acts as a reducing agent.
8. Assertion (A): In the electrolysis of water, the volume of hydrogen liberated is twice the volume of oxygen ……formed.
Reason (R): Water (H,0) has hydrogen and oxygen in the ratio of 1:2 by volume.
9. Assertion (A): Corrosion of iron is commonly known as rusting.
Reason (R): Corrosion of iron occurs in presence of water and air.
10. Assertion (A): The balancing of chemical equations is based on the law of conservation of mass.
Reason (R): Total mass of reactants is equal to the total mass of products.
11. Assertion (A): In a balanced chemical equation, the total mass of the reactants is equal to the total mass of the products.
Reason (R): Mass can neither be created nor destroyed during a chemical change.
12. Assertion (A): Iron articles are painted so as to prevent them from rusting.
Reason (R): When the surface of iron is coated with paint, its surface does not come in contact with oxygen and moisture therefore rusting does not take place.
13. Assertion (A): Chemical reaction changes the physical and chemical state of a substance.
Reason (R): When an electric current is passed through water (liquid), it decomposes to produce hydrogen and
oxygen gases.
14. Assertion (A): When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
Reason (R): The decomposition reaction takes place on the application of heat, therefore, it is an endothermic reaction.
15. Assertion (A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.
Reason (R): Zinc reacts with oxygen to form zinc oxide.
16. Assertion (A): Chips manufacturers usually Ilush bags of chips with a gas such as nitrogen to prevent the chips from getting oxidised.
Reason (R): This increases the taste of the chips and helps in their digestion.
17. Assertion (A): Exposure of silver chloride to sunlight for a long duration turns grey due to the formation of silver by decomposition of silver chloride.
Reason (R): In this process, sublimation of silver chloride takes place.
18. Assertion (A): Rusting of iron metal is the most common form of corrosion.
Reason (R): The effect of rusting of iron can be reversed if they are left open in sunlight.
19. Assertion (A): AgBr is used on photographic and X-ray film.
Reason (R): AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.
20. Assertion (A): Magnesium ribbon keeps on burning in an atmosphere of nitrogen.
Reason (R): Magnesium reacts with nitrogen to form magnesium nitride and this reaction is a combination reaction.
MCC announces NEET UG Counselling 2026 dates, check complete schedule
The Medical Counselling Committee has released the NEET UG Counselling 2026 schedule. Round 1 registration will begin on August 5, followed by four counselling phases, including the Online Stray Vacancy Round.
The Medical Counselling Committee (MCC) has released the complete counselling schedule for NEET UG 2026 admissions under the 15% All India Quota (AIQ) and 100% seats of Deemed Universities, Central Universities, AIIMS, and JIPMER institutions for the 2026-27 academic session.
The counselling process covers admissions to MBBS, BDS and BSc Nursing courses. According to the official schedule, the Round 1 registration process will begin on August 5, while verification of the tentative seat matrix by participating institutes will be completed on August 4.
Round 1 counselling schedule
Registration and fee payment for Round 1 will be available from August 5 to August 12 until 3 pm. Candidates can complete the payment process up to 6 pm on August 12.
Choice filling will begin on August 6 and continue until August 13, with the window closing at 11 am on August 13. Choice locking will be available from 4 pm on August 12 until 11 am on August 13.
The seat allotment process will be conducted between August 13 and August 16, while the Round 1 result will be announced on August 17. Candidates allotted seats must report to their respective institutes between August 18 and August 22. Institutes will verify the details of joined candidates on August 23.
Round 2 counselling dates
Verification of the tentative seat matrix for Round 2 will be conducted on August 24.
Registration and fee payment will be open from August 25 to August 29 until 3 pm, with payment accepted until 6 pm on August 29. Candidates can fill their choices from August 25 to August 30, while the choice-locking facility will remain available between 4 pm and 11 pm on August 30.
Seat allotment will take place from August 31 to September 1, and the results will be declared on September 2. Candidates can report and join their allotted institutes between September 3 and September 8, while institute verification of joined candidates will be carried out on September 9.
Round 3 schedule
For Round 3, verification of the tentative seat matrix is scheduled for September 10.
Registration and fee payment will remain open from September 11 to September 15 until 3 pm, while the payment window will close at 6 pm on September 15. Choice filling will continue from September 11 to September 16, with choice locking available from 4 pm on September 15 until 11 am on September 16.
The seat allotment process will be conducted between September 16 and September 17, and the results will be announced on September 18. Candidates allotted seats can report to their institutes from September 19 to September 26. Verification of joined candidates by institutes will take place on September 27.
Online stray vacancy round
The Online Stray Vacancy Round will begin with verification of the tentative seat matrix on September 27.
Registration and fee payment will be conducted from September 28 to September 30 until 3 pm, while payments can be completed until 6 pm on September 30. Choice filling will also be available during the same period, with choice locking scheduled between 4 pm and 11 pm on September 30.
The seat allotment process will be held on October 1 and October 2, and the result will be declared on October 3. Candidates allotted seats must report to their respective institutes between October 4 and October 10.
The MCC has also instructed all participating institutes and colleges to treat Saturdays, Sundays and gazetted holidays as working days to ensure that the counselling process is completed within the prescribed timeline.
Indian Army Agniveer CEE Result 2026 declared, ARO-wise merit list released
The Indian Army has announced the Agniveer CEE Result 2026. Candidates can now download the ARO-wise merit list and check their eligibility for the next stages of recruitment.
The Indian Army has announced the Agniveer Common Entrance Examination (CEE) Result 2026, allowing candidates to check their qualifying status through the official recruitment portal. The Army Recruitment Office (ARO)-wise merit lists have been uploaded on joinindianarmy.nic.in, where candidates can download the PDF corresponding to their recruitment region.
The merit lists contain the names and roll numbers of candidates who have successfully cleared the written examination and become eligible for the next phase of the Agniveer recruitment process.
How to check Indian Army Agniveer CEE Result 2026
Candidates can access their results by following these steps:
Visit the official Indian Army recruitment website.
Click on the Agniveer CEE Result 2026 link available on the homepage.
Select the relevant Army Recruitment Office (ARO) or recruitment region.
Download the merit list PDF.
Search for your roll number or name to confirm your qualification status.
What happens after the Agniveer CEE result?
Candidates shortlisted in the Common Entrance Examination will now have to undergo the remaining stages of the recruitment process. These include:
Physical Fitness Test (PFT)
Physical Measurement Test (PMT)
Document Verification (DV)
Medical Examination
Only candidates who successfully clear every stage will be considered for final selection under the Agniveer recruitment programme.
Candidates advised to verify details carefully
After downloading the merit list, candidates should carefully check all the information mentioned in the document. If they notice any discrepancy related to their result or personal details, they should immediately contact their respective Army Recruitment Office (ARO) for assistance.
Candidates are also advised to keep checking the official Indian Army recruitment portal for updates regarding the schedule, venue and instructions for the upcoming physical tests, document verification and medical examination.
Board exam marks may get 50% weightage in NEET, JEE admissions under proposed reforms
The Centre is considering giving 50% weightage to board exam marks in admissions based on NEET and JEE. The proposal is part of broader education reforms aimed at reducing exam stress and improving fairness in the admission process.
Board examination marks could soon carry greater significance in admissions to medical and engineering courses, with the Centre reportedly considering a proposal to assign 50% weightage to board scores alongside entrance examinations such as NEET and JEE.
The proposal is part of a broader set of education reforms aimed at reducing the pressure associated with high-stakes examinations and making the admission process more balanced.
According to sources, the proposal is being examined by the Ministry of Education’s nine-member committee that was constituted last year. The panel was tasked with studying students’ growing dependence on coaching institutes, the rise of “dummy schools”, and concerns over fairness in major entrance examinations.
The committee is exploring several measures to improve the existing admission system while reducing the emphasis on a single examination.
Why the reforms are being considered
The discussions come in the wake of multiple controversies involving the examination system, including reported evaluation errors and paper leak incidents. These developments have sparked a wider debate over the credibility and reliability of high-stakes entrance examinations.
To address these concerns, the committee is considering giving 50% weightage to board examination marks in the admission merit process.
Other changes under consideration
Apart from increasing the role of board examination scores, the panel is also examining several other reforms.
These include aligning entrance examinations more closely with school syllabi to reduce students’ dependence on coaching centres, allowing multiple attempts for entrance tests, and gradually introducing adaptive, on-demand computer-based examinations.
Current admission process
At present, admissions to medical and engineering programmes are primarily based on candidates’ performance in entrance examinations such as NEET and JEE. Students are also required to secure the prescribed qualifying marks in their board examinations to become eligible for these entrance tests.
The proposed reforms are currently under consideration, and no final decision has been announced.
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