ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Chemistry (Theory)

Match the following:

Name the important ore of silver. Write all the steps and reactions involved in the Cyanide process for the extraction of silver from its ore.

Answer the followiiig questions: 
Identify the compounds A, B, C and D in the given reaction:

Identify the compounds A, B, C, D, E and F:  

For the complexion of [Co(NH₃)₆]³⁺: 
(i) State the hybridisation of the complex.
(ii) State the magnetic nature of the complex.

 Give a reason for the following:

Fluorine gives only one oxide but chlorine gives a series of oxides.

Write the structures of all enantiomers possible for lactic acid.

Give balanced equations for the following reactions: 

(i) Acetaldehyde is heated with hydroiodic acid in the presence of red phosphorous.
(ii) Calcium acetate is subjected to dry distillation.
(iii) Sodium ethoxide is treated with ethyl bromide.
(iv) Benzaldehyde is treated with sodium bisulphite.

Give balanced chemical equations for the following reactions:

(1) Acetaldehyde reacts with hydrogen cyanide.
(2) Acetone reacts with phenylhydrazine.
(3) Acetic acid is treated with ethanol and a drop of conc. H₂SO₄.

Give one chemical test each to distinguish between the following pairs of compounds:
(1) Acetone and benzaldehyde.
(2) Phenol and benzoic acid.

Choose the most correct option.

Which one of the following has the lowest acidity?

Identify the compounds [A], [B] and [C] in the following reaction.

\[\ce{C6H5NO2->[6{[H]}][Sn/HCl][A]->[HNO2 + HCl][273K-278K][B]->[C6H5NH2] [C]}\]

Identify the compounds [A], [B] and [C] in the following reaction.

\[\ce{CH3CH2NH2->[(1) HNO2][(2) P/Cl2][A]->[(1) KCN][(2) H2O/H+][B]->[(1) NH3/heat][(2) Br2/KOH][C]}\]

In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?

Define electrochemical cell

State Raoult’s law for the solution containing volatile components

Why does the cell potential of mercury cell remain constant throughout its life?

From the given cells:

Lead storage cell, Mercury cell, Fuel cell and Dry cell

Answer the following:

(i) Which cell is used in hearing aids?

(ii) Which cell was used in Apollo Space Programme?

(iii) Which cell is used in automobiles and inverters?

(iv) Which cell does not have long life?

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

Define azeotropes.