Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?

What is the role of cryolite in the extraction of aluminium?

What is the role of limestone in the extraction of iron from its oxides?

What is the role of CO in the extraction of Iron?

In the extraction of Al, impure Al₂O₃ is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?

What is the role of coke in the extraction of iron from its oxides?

Indicate the principle behind the method used for the refining of zinc.

What is the role of silica in the extraction of copper?

Which form of the iron is the purest form of commercial iron?

Describe the roles of the following: SiO₂ in the extraction of copper from copper matte

Name the method used for refining of copper metal.

Classify the following solids in different categories based on the nature of intermolecular forces operating in them:

Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.

Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.

1. Tetra phosphorus decoxide (P₄O₁₀)
2. Ammonium phosphate (NH₄)₃PO₄
3. SiC
4. I₂
5. P₄
6. Plastic
7. Graphite
8. Brass
9. Rb
10. LiBr
11. Si

Define the term solution.

Which of the ores mentioned can be concentrated by magnetic separation method?

Differentiate between “minerals” and “ores”.

Write the formula for the following coordination compound:

Iron (III) hexacyanoferrate (II)

Arrange the following compound groups in the increasing order of their property indicated :

p-nitrophenol, ethanol, phenol (acidic character)

Arrange the following compound groups in the increasing order of their property indicated :

Propanol, Propane, Propanal (boiling point)

Based on the nature of intermolecular forces, classify the following solids:

Sodium sulphate, Hydrogen