CBSE 12TH CHEMISTRY - Online Test
Q1. Equanil is used to
Answer : Option A
Explaination / Solution:
It is used to relieve tension.
Q2. Which of the following pair contains complex salt and double salt respectively?
Answer : Option A
Explaination / Solution:
[Cu(NH3)4]SO4 this is complex salt while K2SO4Al2(SO4)3.24H2O is double salt.
Q3. Kohlrausch law of independent migration of ions states
Answer : Option A
Explaination / Solution:
Statement of Kohlrausch Law.
Q4.
Answer : Option D
Explaination / Solution:
For SN1 stability of carbocation which matters. In C6H5C(CH3)(C6H5)Br carbocation will be tertiary and will be resonance stablised.
Q5. The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called
Answer : Option B
Explaination / Solution:
The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called threshold energy.
Q6. Substances that alter the rate of a chemical reaction without being used up in a chemical reaction is known as
Answer : Option D
Explaination / Solution:
Catalyst only increases or decreases the activation energy of a reaction. It doesnot get used up in reaction.
Q7. Glycosidiclinkage:is found between
Answer : Option C
Explaination / Solution:
Glycosidic bond is an ether linkage between two monosaccharides.
Q8. Alcohols have high boiling points because of
Answer : Option C
Explaination / Solution:
In alkanes, the only intermolecular forces are van der Waals dispersion forces. Hydrogen bonds are much stronger than these and therefore it takes more energy to separate alcohol molecules than it does to separate alkane molecules. That's the main reason that the boiling points are higher.
Q9. Carbylamine reaction is one of the following in the presence of heat
Answer : Option D
Explaination / Solution:
In carbylamines reaction primary amine reacts with chloroform and base to form isocyanide having foul smell.
Q10. The rate at which a solid dissolves in liquid does not depend on
Answer : Option B
Explaination / Solution:
The rate at which a solid dissolves in liquid does not depend on pressure.
