CBSE 12TH CHEMISTRY - Online Test
Q1. Which of the following can be termed as mixed complex?
Answer : Option B
Explaination / Solution:
In A one and more different types of ligands are present.
Q2. One of the simplest methods of preventing corrosion is to prevent the surface of the metallic object to come in contact with atmosphere. This can be done
Answer : Option C
Explaination / Solution:
Best way to prevent corrosion is to prevent the surface of metallic object to come in contct with atmosphere.
Q3. Alkyl halides are insoluble in water
Answer : Option C
Explaination / Solution:
In alkyl halides, there exist dipole-dipole attractions where as in water van der waal's forces or the hydrogen bonding exists.. It is difficuilt for alkyl halides to break these hydrogen bonds, hence making them almost insoluble in water.
Q4. Which among the following statement is not true for catalyst?
Answer : Option C
Explaination / Solution:
Catalyst does not change the equilibrium constant it only helps in reaching the equilibrium at a faster rate,i.e. it catalyses the forward as well as teh backward reactions to the same extent so that the equilibrium state remains same but is reached earlier.
Q5. Which among the following is an example of sorption?
Answer : Option B
Explaination / Solution:
When chalk is dipped in ink, absorption and adsorption both takes place.
Q6. The bond –CO–NH– is called
Answer : Option B
Explaination / Solution:
Peptide linkage is present in proteins formed by combination of amino acids.
Q7. One of the following alcohols do not undergo oxidation reaction
Answer : Option A
Explaination / Solution:
The outcome of oxidation reactions of alcohols depends on the substituents on the carbinol carbon. In order for each oxidation step to occur, there must be H on the carbinol carbon.
- Primary alcohols can be oxidised to aldehydes or further to carboxylic acids. In aqueous media, the carboxylic acid is usually the major product. PCC or PDC, which are used in dichloromethane, allow the oxidation to be stopped at the intermediate aldehyde.
- Secondary alcohols can be oxidised to ketones but no further:
- Tertiary alcohols cannot be oxidised (no carbinol C-H)
Q8. If the temperature of an aqueous solution increases, it will cause
Answer : Option D
Explaination / Solution:
As temperature increases volume also increases and so Molarity decrease.
Q9. Diazonium salts are used in the preparation of
Answer : Option A
Explaination / Solution:
Diazonium salt on reaction with other aromatic compounds produces dyes.
Q10.
In the following reaction, the polymer formed is ?
Answer : Option B
Explaination / Solution:
These monomers form PHBV.
