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

What is meant by the chelate effect? Give an example.

Why carboxylic acid does not give reactions of carbonyl group?

Illustrate the following reaction giving suitable example in each case: Diazotisation

Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :

`Ag^+(aq)+e^(-)rarrAg(s)" ""      ""       "E^@=+0.80V`

`H^+(aq)+e^(-)rarr1/2H_2(g)" "" "" " E^@=0.00V`

On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why ?

Define the following term :

Peptization

Calculate Δ_rG^° for the reaction 

Mg (s) + Cu²⁺ (aq) → Mg²⁺ (aq) + Cu (s)

Given : E^°_cell = + 2.71 V, 1 F = 96500 C mol^–1

Define the following terms as related to proteins :

Peptide linkage

Why is it essential to wash the precipitate with water before estimating it quantitatively?

Discuss briefly, giving an example of the role of coordination compounds in medicinal chemistry.

Draw the structure of the given derivative.

Acetaldehydedimethylacetal

What is the effect of catalyst on: Gibbs energy (∆G)

What is the effect of catalyst on activation energy of a reaction?

What happens when conc. is H₂SO₄ added to Cu? Write the equations.

What happens when SO₃ is passed through water? Write the equations.

Draw the structure of the following:

H₂S₂O₇

Using IUPAC norms write the formulae for Potassium trioxalatoaluminate(III)

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

Write the chemical method by which Fe(OH)₃ sol is prepared from FeCl₃.

Account for the following:

Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.

Write the structures of the main products in the following reactions :