CBSE 12TH CHEMISTRY - Online Test
Q1. Which among the following statement is not true for rate constant of a reaction?
Answer : Option B
Explaination / Solution:
Rate constant is independent of concentration of reactant.
Q2. Pt and Pd adsorb large volume of hydrogen under specific conditions. The hydrogen so adsorbed is called
Answer : Option D
Explaination / Solution:
Adsorption of hydrogen by metal like Pt is occlution and hydrogen is known as occluded hydrogen.
Q3. Which of the following amines can be resolved into enantiomers?
Answer : Option B
Explaination / Solution:
2-pentanamine forms enantiomers.
Q4. In alcohols, increase of branching in carbon chain results in boiling point
Answer : Option B
Explaination / Solution:
As the length of carbon chain increases, the surface area of the compound will also increase. Van der Waals dispersion force is proportional to the surface area. So the increase of surface are increases the ability of individual molecules to attract each other. Branching in molecules decreases the surface area thereby decreasing the attractive force between individual molecules. As a result, the boiling point decreases.
Q5. The use of pressure cooker reduces cooking time because it creates
Answer : Option A
Explaination / Solution:
High pressure increases the boiling point of water so it reduces the cooking time.
Q6. Amines are soluble in
Answer : Option C
Explaination / Solution:
Amines are soluble in water due to hydrogen bonding with water.
Q7. Name the gas whose formula was established by Sorret.
Answer : Option C
Explaination / Solution:
Sorret established formula of ozone.
Q8. Impurities associated with Bauxite ore is/are
Answer : Option A
Explaination / Solution:
Bauxite ore have silica, TiO2 and Fe2O3 as impurity.
Q9. Packing efficiency for simple cubic structure is
Answer : Option A
Explaination / Solution:
Simple cubic have packing efficiency of 52%.
Q10. Which of the following options is monomer units of the below polymer
Answer : Option D
Explaination / Solution:
this is monomer unit present in the above given polymer.
this is monomer unit present in the above given polymer.
