New Delhi:

The Central Board of Secondary Schooling (CBSE) will conduct the Chemistry examination for the scholars of Class 12 on February 27, 2024. College students who shall be showing within the examination can test the official web site of the CBSE for earlier yr’s query papers for Chemistry. The next are excessive mark questions from the earlier yr’s Chemistry board examination.

Essential Chemistry questions

• a) A component has an atomic mass 93 g mol-1 and density 11.5 g cm-3. If the sting size of its unit cell is 300 pm, determine the kind of unit cell.
• b) Write any two variations between amorphous solids and crystalline solids.

• a) A primary order response takes 100 minutes for completion of 60% of the response. Discover the time when 90% of the response shall be accomplished.
• (b) With the assistance of diagram clarify the position of activated complicated in a response.

• The weather of 3d transition collection are given as: Se Ti V Cr Mn Fe Co Ni Cu Zn
• (i) Write the factor which reveals most variety of oxidation states. Give purpose.
• (ii) Which factor has the best m.p.?
• (iii) Which factor reveals solely +3 oxidation state?
• (iv) Which factor is a robust oxidizing agent in +3 oxidation state and why?

• Perform the next conversions :
• a) Ethanal to However-2-en-1-al
• b) Propanoic acid to 2-chloropropanoic acid

• Distinguish with an appropriate chemical check :
• a) CH3COCH2CH3 and CH3CH2CH2CHO
• b) Ethanal and Ethanoic acid

   

• a)Write the construction of oxime of acetone.

   

• Assign purpose for every of the next:
• (i) Manganese reveals the best oxidation state of +7 among the many 3d collection of transition parts.
• (ii) Transition metals and their compounds are typically discovered to be good catalysts in chemical reactions.
• (iii) Zn has lowest enthalpy of atomization.
• (iv) Cu+ is unstable in an aqueous answer.