Science (English Medium) Class 12 - CBSE Important Questions for Chemistry

Write IUPAC name of the following Complex [Cr(NH₃)₃Cl₃]

Complete the following reactions

NH₃+3Cl₂(excess) ---->

What type of colloid is formed when a gas is dispersed in a liquid? Give an example

Using IUPAC norms write the formulae for Dichloridobis(ethane-1,2-diamine)cobalt(III)

What type of isomerism is shown by the complex [Co(NH₃)₅(SCN)]²⁺?

Why is [NiCl₄]²⁻ paramagnetic while [Ni(CN)⁴]²⁻ is diamagnetic? (Atomic number of Ni = 28)

Why are low spin tetrahedral complexes rarely observed?

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