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

Write one difference in Homogeneous catalysis and Heterogeneous catalysis

Given reasons: S_N1 reactions are accompanied by racemization in optically active alkyl halides.

What type of azeotrope is formed by positive deviation from Raoult’s law?

Define the following with an example of each

Polysaccharides

Which would undergo S_N2 reaction faster in the following pair and why ?

CH₃ – CH₂ ​– Br and CH₃ ​– CH₂ ​– I

What is meant by negative deviation from Raoult's law? Give an example. What is the sign of ∆_mixH for negative deviation?

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

Draw the geometrical isomers of complex [Pt(en)₂Cl₂]²⁺.

Give reasons for the following observations :

 A delta is formed at the meeting point of sea water and river water.

Complete the following chemical equation:

\[\ce{Ca3P2 + H2O ->}\]

Which alkyl halide from the following pair is chiral and undergoes faster S_N2 reaction?

Out of S_N1 and S_N2, which reaction occurs with

(a) Inversion of configuration
(b) Racemisation

Resistance of a conductivity cell filled with 0.1 mol L⁻¹ KCl solution is 100 Ω. If the resistance of the same cell when filled with 0.02 mol L⁻¹ KCl solution is 520 Ω, calculate the conductivity and molar conductivity of 0.02 mol L⁻¹KCl solution. The conductivity of 0.1 mol L⁻¹ KCl solution is 1.29 × 10⁻² Ω⁻¹ cm⁻¹.

Some liquids on mixing form 'azeotropes'. What are 'azeotropes'?

What is the effect of temperature on ionic conductance? 

What is the significance of number of 6,6 in the polymer nylon-6,6?

State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution which obey Raoult’s law at all concentrations. 

Write the structures of monomers used the following polymers: 
Nylon - 6, 6

Write the equation involved in Friedal-Crafts Alkylation of Phenol 

Answer the following question.
Write one stereochemical difference between S_N1 and S_N2 reactions.