CBSE Board Exam 2025: CBSE is administering the Class 10 and 12 board exams for the 2025 academic year. The Class 10 examinations started with English, while the Class 12 exams started with Entrepreneurship. The Chemistry 12 exam is set for February 27, 2025. Students can view sample papers on the CBSE’s official website.
Table of Contents
CBSE Board Exam 2025 for Here are some significant questions from the sample papers:
- What kind of divergence from Roult’s Law can be expected when phenol and aniline are mixed? What predicted change in the mixture’s net volume? Graph the deviation.
- At a specific temperature, pure water has a vapour pressure of 23.80 mm Hg. If one mole of a nonvolatile non-electrolytic solute is dissolved in one hundred grammes of water, Calculate the resulting vapour pressure of the solution.
- Radioactive decay has first-order kinetics. The initial amount of two radioactive elements, X and Y, is 1 gm each. What will be the ratio of X to Y after two days if their half-lives are 12 and 16 hours, respectively?
- The second ionisation enthalpies for chromium and manganese are 1592 and 1509 kJ/mol, respectively. Explain the decreased value of Mn.
- Which would you prefer as a sacrificial electrode to protect iron against corrosion: Ni or Zn? Why? (The conventional electrode potentials for Ni, Fe, and Zn are -0.25 V, -0.44 V, and -0.76 V, respectively.)
- Explain why electrophilic substitution reactions in haloarenes occur slowly and require more extreme conditions than those in benzene.
- Write the structure of the product generated when acetone reacts with 2,4-DNP reagent.
you join our tazatimesnews Telegram Channel
you join our whatsapp channel
Next News Read – US deportations Indians : A Usa plane carrying a 3rd batch of illegal Indian immigrants arrives in Amritsar.
