CBSE 12TH CHEMISTRY - Online Test
Q1.
For a reaction; pA +qB products, the rate law expression is
Answer : Option B
Explaination / Solution:
Order of a reaction is experimentally determined quantity. It may or may not be equal to stoichiometric coefficients.
Q2. The emulsifying agent present in milk that makes it stable is
Answer : Option B
Explaination / Solution:
fact
Q3. Aldehydes react with Grignard reagent to produce
Answer : Option A
Explaination / Solution:
The Grignard Reaction is the addition of an organomagnesium halide (Grignard reagent) to a ketone or aldehyde, to form a tertiary or secondary alcohol, respectively. The reaction with formaldehyde leads to a primary alcohol.
Grignard Reagents are also used in the following important reactions: The addition of an excess of a Grignard reagent to an ester or lactone gives a tertiary alcohol in which two alkyl groups are the same, and the addition of a Grignard reagent to a nitrile produces an unsymmetrical ketone via a metalloimine intermediate.
Q4. Quaternary ammonium salt is formed
Answer : Option A
Explaination / Solution:
Q5. Which of the following is a colligative property?
Answer : Option D
Explaination / Solution:
Colligative property is dependent on no. of moles of solute. (Л=cRT)
Q6.
is a polymer obtained from?
Answer : Option A
Explaination / Solution:
This is polymer obtained from monomer styrene
Q7. Which compound is used as the cooling liquid in refrigerators?
Answer : Option C
Explaination / Solution:
NH3 is used as cooling liquid in refrigerators
Q8. The process of separating gangue and other impurities from the metals is known as
Answer : Option D
Explaination / Solution:
Process of removal of impurities from ore is known as concentration of ore or benefication of ore.
Q9. Electronic configuration of Cu3+ is
Answer : Option B
Explaination / Solution:
Cu has atomic number 29.
Q10. Esters react with DIBAL – H to produce
Answer : Option C
Explaination / Solution:
Esters are reduced to aldehydes with DIBAL-H.
