Question: Define Geometric Isomerism
Answer: Geometric isomerism is a type of stereoisomerism that occurs when two or more molecules have the same molecular formula and molecular structure, but the spatial arrangement of atoms within the molecule differs. This type of isomerism is most common in compounds with double bonds, but can also occur in compounds with single bonds.
Question: Why phenols are acidic.
Answer: Phenols are acidic in nature because they contain an electrically charged group of atoms called a hydroxyl group (–OH). This group can easily donate a proton (H+) when exposed to a base, making the molecule more acidic.
The boiling point of halo-alkanes are in the order
Answer: 1. Methane (CH4) 2. Ethane (C2H6) 3. Propane (C3H8) 4. Butane (C4H10) 5. Pentane (C5H12) 6. Hexane (C6H14) 7. Heptane (C7H16) 8. Octane (C8H18) 9. Nonane (C9H20) 10. Decane (C10H22)
Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE Class 12th Chemistry Paper Code (HSEIIRKO-13-X) Long Answer Type Questions (Each carries 5 Marks) Question: Discuss briefly the oxidation states of the 3d-transition series. Answer: The 3d-transition series is composed of elements from the fourth period of the periodic table, including scandium (Sc), titanium (Ti), vanadium (V), chromium
Define Calcination? Give an Example?
Answer: Calcination is the process of heating a solid substance to a high temperature to drive off its volatile components or to achieve a desired chemical or physical change. An example of calcination is the process of roasting gypsum to produce plaster of Paris.
Question: Describe the formation and objective of UPA?
Answer: The United Progressive Alliance (UPA) is a coalition of political parties in India formed after the 2004 general election. It was formed at the initiative of the Indian National Congress (INC) and comprised several other left-leaning parties and regional parties.
The main objective of UPA is to provide a stable and progressive government that can take India to new heights of growth and development. The UPA also focuses on creating jobs, providing better healthcare, education, and infrastructure, and ensuring the safety and security of all citizens. Additionally
Solved Model Question Paper for Class 12th Political Science (2023) NCERT/CBSE Read More »
Question: What do you understand by sustainable development? What was the outcome of the Rio summit? 4 Marks
Answer: Sustainable development is a concept that calls for the development of strategies and policies that meet the needs of the present without compromising the ability of future generations to meet their own needs. It is based on the idea of creating a balance between economic growth, social progress, and environmental protection.
The outcome of the Rio summit was the adoption of Agenda 21. This is a comprehensive plan of action to be taken globally, nationally and locally by organizations of the United Nations system, governments, and major groups in every area in which human impacts the environment.
Solved Model Question Paper for Class12th Political Science (2023) NCERT/CBSE Read More »
Fill in the blanks:
i. ____________ is the present UN Secretary-General.
Answer: António Guterres
ii. Alliance-building is a component of __________ Security.
Answer: Cooperative
iii. Planning Commission was set up in __________.
Answer: 1950
iv. ___________ was the official candidate of congress in the 1969 Presidential election.
Answer: Indira Gandhi
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What is the value of the refractive index for water and a crown glass?
Answer: Refractive index for water = 1.333
The refractive index for crown glass = 1.517
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Question: How Polythene is prepared
Answer: Polythene is prepared through a process called polymerization. This process involves the combination of two or more monomers (small molecules) to create a larger molecule. The monomers used to create polythene are typically ethylene, which is derived from natural gas or petroleum and can be combined through a variety of different methods. The result is a plastic that is lightweight, yet strong and durable.
