Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

 A first order reaction is 50% complete in 25 minutes. Calculate the time for 80% completion of the reaction.

Give a simple chemical test to distinguish between 
 

Write the main product formed when propanal reacts with the following reagents: 
2 moles of 3 CH OH in presence of dry HCl 

Write the main product formed when propanal reacts with the following reagents: 
H₂N- NH₂  followed by heating with KOH in ethylene glycol.

 Acetone, Acetaldehyde, Benzaldehyde, Acetophenone – reactivity towards addition of HCN. 

Answer the following question.
What is the basic structural difference between glucose and fructose?

Write the name of gas released when Cu is added to dilute HNO₃

Write the name of gas released when Cu is added to the conc. HNO₃ 

Answer the following question.
Write the disproportionation reaction of H₃PO₃. 

State Henry’s law.

Answer the following question.
Write IUPAC name of the complex [Pt(en)₂CI₂]. Draw structures of geometrical isomers for this complex.

Why type of drug is used in sleeping pills?

Write the reaction involved when D-glucose is treated with the following reagent:

Br₂ water

Write the reactions involved when D-glucose is treated with the following reagent:
H₂N-OH

Write the reaction involved when D-glucose is treated with the following reagent:

(CH₃CO)₂O

Why phenol undergoes electrophilic substitution more easily than benzene?

What is the total number of atoms per unit cell in a face-centered cubic structure?

The number of atoms per unit cell in a body centered cubic structure is ____________.

An atom located at the body center of a cubic unit cell is shared by ____________.

Volume of unit cell occupied in face-centered cubic arrangement is ____________.