Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

For a reaction
\[\ce{2H2O2->[I^-][Alkaline medium]2H2O + O2}\]

The Proposed mechanism is given below: 
(1) H₂O₂+I^- → H₂O+IO^-(slow)
(2) H₂O₂+IO^-→H₂O+I^-+O₂(fast)

(i) Write the rate law for the reaction.
(ii) Write the overall order of a reaction.
(iii) Out of steps(1) and (2), which one is the rate-determining step? 

Write chemical reactions taking place in the extraction of copper from Cu₂ S. 

Is   a homopolymer or copolymer? Give reason. 

Why the use of alitame as an artificial sweetener is not recommended? 

Write chemical equations of the following reaction : 

Propanone is treated with dilute Ba (OH)_2-.

Write chemical equations of the following reaction :
Benzoyl chloride is hydrogenated in the presence of `"Pd"/(BaSO_4)`

Write a chemical equation for the following reaction: 
Propanone is treated with dilute Ba( OH)₂.

How will you convert the following:
Zinc blende to Zinc metal

Why the use of alitame as an artificial sweetener is not recommended?

Write equations of the following reactions:
Carbyl amine reaction

Account for the following:
o-nitrophenol is more steam volatile than p-nitrophenol.

Coordination number of hcp and ccp is ____________.

Which of the following lattices has the highest packing efficiency?

In cubic close packing (ccp) arrangement, the pattern of the successive layers will be designated as ____________.

When measuring conductivity with a conductivity cell, cell constant denoted by the symbol G* is given by (electrode area of cross-section equal to ‘A’ and separated by distance ‘l’)

Substance that enhances the activity of a catalyst is known as ____________.

The impurity that is added externally to remove the impurity already present in the ore is known as ____________.

Which one of the following shows the carbylamine reaction in the presence of heat?

The coordination number in hcp is ____________.

Which one of the following statements about packing in solids is incorrect?