Examine Crucial Questions for the Chemistry Boards

On February 27, 2024, the Chemistry examination for Class 12 students will be administered by the Central Board of Secondary Education (CBSE). Students who plan to take the exam can review Chemistry question papers from previous years by visiting the CBSE's official website. These are high-scoring questions from the Chemistry board exam from the previous year.
Crucial questions in chemistry
a) An element has a density of 11.5 g cm-3 and an atomic mass of 93 g mol-1. Determine the type of unit cell if the edge length of the cell is 300 pm.
b) List any two ways that crystalline and amorphous solids differ from one another.a) It takes 100 minutes for 60% of a first order reaction to be completed. Determine the point at which 90% of the reaction will have finished.

(b) Describe the function of the activated complex in a reaction using the diagram.
The following are the components of the 3D transition series: Cr Mn Fe Co Ni Cu Zn Se Ti V
(i) Write the element that has the most oxidation states possible. Give an explanation.
(ii) What is the highest m.p. element?
Which element only exhibits the +3 oxidation state (iii)?
(iv) In the +3 oxidation state, which element is a potent oxidizing agent and why?

Perform the subsequent conversions:
a) But-2-en-1-al to Ethanal
b) 2-chloropropanoic acid is produced from propanoic acid.
Identify using an appropriate chemical test:
a) CH3CH2CH2CHO and CH3COCH2CH3.
b) Acid ethanolic and ethanolal

a) Write the acetone oxime's structure.
Give a rationale for every one of the following:
(i) Of the transition elements in the 3d series, manganese has the highest oxidation state of +7.
(ii) It is generally discovered that transition metals and their compounds function well as catalysts in chemical reactions.

(iii) Zn has the lowest atomization enthalpy.
(iv) In an aqueous solution, Cu+ is unstable.