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

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Chemistry (Theory)
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What is rate of reaction?

[3.08] Rate of Reaction
Chapter: [3.08] Rate of Reaction
Concept: Rate of a Chemical Reaction

Match the following:

1 Disaccharide a Lucas reagent
2 Carbylamine b Condensation polymer
3 Dacron c Obnoxious smell
4 Low spin complex `d^2sp^3` d Sucrose
5 Anhydrous `ZnCl_2 + conc.HCl` e Hexaamminecobalt(III)ion

 

[0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Concept: Cyanides, Isocyanides and Nitro Compounds

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.

[0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Concept: Cyanides, Isocyanides and Nitro Compounds

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

[13.01] Carbonyl compounds
Chapter: [13.01] Carbonyl compounds
Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids

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

[0.07] Coordination Compounds
Chapter: [0.07] Coordination Compounds
Concept: Coordination Compounds > Concept of Complexes

Write the structures of all enantiomers possible for lactic acid.

[0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
Concept: Introduction of Carbohydrates

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.

[13.01] Carbonyl compounds
Chapter: [13.01] Carbonyl compounds
Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids

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.

[13.01] Carbonyl compounds
Chapter: [13.01] Carbonyl compounds
Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids

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

[13.01] Carbonyl compounds
Chapter: [13.01] Carbonyl compounds
Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids

Choose the most correct option.

Which one of the following has the lowest acidity?

[13.01] Carbonyl compounds
Chapter: [13.01] Carbonyl compounds
Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids

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

[1.01] Raoult's law and colligative properties
Chapter: [1.01] Raoult's law and colligative properties
Concept: Vapour Pressure of Liquid > Vapour Pressure of Liquid- Liquid Solutions

Define electrochemical cell

[6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Chapter: [6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Concept: Batteries > Primary Batteries

State Raoult’s law for the solution containing volatile components

[1.01] Raoult's law and colligative properties
Chapter: [1.01] Raoult's law and colligative properties
Concept: Vapour Pressure of Liquid > Vapour Pressure of Liquid- Liquid Solutions

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

[6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Chapter: [6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Concept: Batteries > Primary Batteries

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?

[6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Chapter: [6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Concept: Batteries > Primary Batteries

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

[1.01] Raoult's law and colligative properties
Chapter: [1.01] Raoult's law and colligative properties
Concept: Vapour Pressure of Liquid > Vapour Pressure of Liquid- Liquid Solutions

Define azeotropes. 

[1.01] Raoult's law and colligative properties
Chapter: [1.01] Raoult's law and colligative properties
Concept: Vapour Pressure of Liquid > Vapour Pressure of Liquid- Liquid Solutions

Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?

[1.01] Raoult's law and colligative properties
Chapter: [1.01] Raoult's law and colligative properties
Concept: Vapour Pressure of Liquid > Vapour Pressure of Liquid- Liquid Solutions

Define the following term: Primitive unit cells

[0.02] States of Matters: Structure and Properties Solid State
Chapter: [0.02] States of Matters: Structure and Properties Solid State
Concept: Crystal Lattices and Unit Cells

What type of battery is mercury cell? Why is it more advantageous than dry cell?

[6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Chapter: [6.02] Galvanic cells, mechanism of current production in a galvanic cell;
Concept: Batteries > Primary Batteries
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