Name: Dinesh New Millennium Practical Manual in Chemistry Class 12th
Brand: Disha Publication
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Dinesh New Millennium Practical Manual in Chemistry Class 12th

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Q1

What is the aim of Experiment A-5?

A1

To prepare ferric hydroxide sol by hydrolysis of ferric chloride. This colloidal sol demonstrates precipitation and peptisation principles in surface chemistry.
Q2

How does concentration affect reaction rate in Experiment B-1?

A2

Increasing sodium thiosulfate concentration reduces reaction time with HCl, as higher concentration increases collision frequency, speeding up sulphur precipitation.
Q3

What is the calorimeter constant determined in Experiment C-1?

A3

It is the heat capacity of the polythene calorimeter, measured in J/°C. It accounts for heat absorbed by the calorimeter during enthalpy experiments.
Q4

Why is salt bridge used in Experiment D-1?

A4

It completes electrical circuit without mixing electrolytes, minimises liquid junction potential, and maintains electrical neutrality in Zn/Zn²⁺, Cu²⁺/Cu cell.
Q5

Which emulsifying agent works best in Experiment A-9?

A5

Soap or gelatin typically stabilises emulsions longest by reducing interfacial tension and forming protective films around dispersed droplets.
Q6

What is the role of starch in Experiment B-3?

A6

Starch acts as an indicator for iodine liberated during reaction of iodide ions with hydrogen peroxide, producing a blue-black colour.
Q7

Calculate water of crystallisation in Mohr’s salt from Experiment J-5.

A7

Using 0.01 M KMnO₄ titration, moles of Fe²⁺ are found. Mass loss on heating gives water content, yielding formula FeSO₄.(NH₄)₂SO₄.6H₂O.
Q8

Name two adulterants detected in turmeric powder (Project 8).

A8

Metanil yellow (a non-permitted dye) and chalk powder. Both are identified by adding concentrated HCl or dil. H₂SO₄.
Q9

What is the effect of high temperature on salivary amylase in Project 5?

A9

High temperature (above 70°C) denatures salivary amylase protein, permanently destroying its active site and halting starch digestion.
Q10

How is the cell potential affected by CuSO₄ concentration in Experiment D-1?

A10

Increasing CuSO₄ concentration increases reduction potential of Cu²⁺/Cu half-cell, thus raising overall cell potential (Ecell).

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Q1

What is the aim of Experiment A-5?

A1

To prepare ferric hydroxide sol by hydrolysis of ferric chloride. This colloidal sol demonstrates precipitation and peptisation principles in surface chemistry.
Q2

How does concentration affect reaction rate in Experiment B-1?

A2

Increasing sodium thiosulfate concentration reduces reaction time with HCl, as higher concentration increases collision frequency, speeding up sulphur precipitation.
Q3

What is the calorimeter constant determined in Experiment C-1?

A3

It is the heat capacity of the polythene calorimeter, measured in J/°C. It accounts for heat absorbed by the calorimeter during enthalpy experiments.
Q4

Why is salt bridge used in Experiment D-1?

A4

It completes electrical circuit without mixing electrolytes, minimises liquid junction potential, and maintains electrical neutrality in Zn/Zn²⁺, Cu²⁺/Cu cell.
Q5

Which emulsifying agent works best in Experiment A-9?

A5

Soap or gelatin typically stabilises emulsions longest by reducing interfacial tension and forming protective films around dispersed droplets.
Q6

What is the role of starch in Experiment B-3?

A6

Starch acts as an indicator for iodine liberated during reaction of iodide ions with hydrogen peroxide, producing a blue-black colour.
Q7

Calculate water of crystallisation in Mohr’s salt from Experiment J-5.

A7

Using 0.01 M KMnO₄ titration, moles of Fe²⁺ are found. Mass loss on heating gives water content, yielding formula FeSO₄.(NH₄)₂SO₄.6H₂O.
Q8

Name two adulterants detected in turmeric powder (Project 8).

A8

Metanil yellow (a non-permitted dye) and chalk powder. Both are identified by adding concentrated HCl or dil. H₂SO₄.
Q9

What is the effect of high temperature on salivary amylase in Project 5?

A9

High temperature (above 70°C) denatures salivary amylase protein, permanently destroying its active site and halting starch digestion.
Q10

How is the cell potential affected by CuSO₄ concentration in Experiment D-1?

A10

Increasing CuSO₄ concentration increases reduction potential of Cu²⁺/Cu half-cell, thus raising overall cell potential (Ecell).

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