Chemistry - Online Test
Q1. A mixture containing two enantiomers in equal proportions
Answer : Option D
Explaination / Solution:
For a mixture of two enantiomers , one rotates the plane polarized light towards left and other towards right therefore there is no optical rotation and hence mixture is optically inactive.
Q2.
The molecular formula represents two alcohols: propan-1-ol and propan-2-ol. This property is called as:
Answer : Option D
Explaination / Solution:
propan-1-ol and propan-2-ol are positional isomers as they differ only in the position of functional group -OH.
Positional isomers are isomers that have the same carbon skeleton and the same functional groups but differ from each other in the location of the functional groups on or in the carbon chain.
Q3. The alkali metals burn vigorously in oxygen forming oxides. Hence, potassium forms
Answer : Option A
Explaination / Solution:
alkali metals burns vigorously to form superoxides. Superoxide O2- ion is only in the presence of large cations such as potassium, Rb and Cs
Q4. The constant k used in rate equation is known as
Answer : Option B
Explaination / Solution:
Rate constant is also known as velocity constant.
Q5. The basic principle of Cottrell precipitator is
Answer : Option D
Explaination / Solution:
It is used for decreasing air pollution by neutralizing the colloid.
Q6. Which is the correct form of van der Waals equation?
Answer : Option A
Explaination / Solution:
is vanderwall gas equation of real gases.
Q7. If the Kc is neither too small nor too large, one of the following will happen
Answer : Option C
Explaination / Solution:
Rxn is at equilibrium.
Q8. Amino acids are components of
Answer : Option D
Explaination / Solution:
Proteins are formed by combination of amino acids
Q9. Boiling points of alcohols and phenols are higher than
Answer : Option B
Explaination / Solution:
- The oxygen atom of an alcohol is sp3 hybridised and has two non bonding pairs of electrons.
- The O-H bond of alcohols is strongly polarised and hydrogen bonding occurs in much the same way as in water molecules
- As a consequence, alcohols have relatively high boiling points compared to other organic compounds of a similar molecular weight.
Q10. Thus ethyne molecule consists of
Answer : Option C
Explaination / Solution:
Ethyne is an unsaturated compound which belongs to the alkyne family and has the formula C2H2.Thus it consists of one C–C σ bond, two C–H σ bonds and two C–C π bonds.
