Science (English Medium) कक्षा १२ - CBSE Important Questions

Write one difference in Multimolecular colloid and Associated colloid

Write the structures of compounds A, B and C in the following reactions:

Write the structures of compounds A, B and C in the following reactions

Physisorption is reversible while chemisorption is irreversible. Why ?

Why is Butan-1-ol optically inactive but Butan-2-ol is optically active?

Write the hybridization type and magnetic behaviour of the complex [Ni(CN)₄]²⁻. (Atomic number of Ni = 28)

Give reasons for the following observations :

NH₃ gas adsorbs more readily than N₂ gas on the surface of charcoal.

Give reasons for the following observations :

 Powdered substances are more effective  adsorbents.

Give one example each of 'oil in water' and 'water in oil' emulsion.

Give one example each of sol and gel.

Give one example each of sol and gel.

Define the following with a suitable example, of each: 
Multimolecular colloid

 Define the following with a suitable example, of each: 
 Gel

 What is the role of promoters and poisons in catalysis?

 Out of    _{and  , which one is optically active and why ?}

Give one chemical test as an evidence to show that [Co (NH₃)₅Cl]  are ionisation isomers. 

[NiCl₄]^2- is paramagnetic while [Ni(CO)₄] is  diamagnetic though both are tetrahedral. Why? (Atomic no. Ni = 28) 

 Write the electronic configuration of Fe(III) on the basis of crystal field theory when it forms an octahedral complex in the presence of (i) strong field, and (ii) weak field ligand. (Atomic no.of Fe=26) 

Write IUPAC name of the complex [Pt(en)₂Cl₂]. Draw structures of geometrical isomers for this complex. 

Write structures of compounds A and B of the following reaction :