Chemistry - Online Test
Q1. Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv)formic acid
Answer : Option B
Explaination / Solution:
Fluorine is most electronegative so it increases acidity.
Q2. Molecular mass of glucose is
Answer : Option D
Explaination / Solution:
Molecular mass of Glucose is calculated using the relation :
Molecular mass
= ( 6*atomic mass of C , 12* atomic mass of H , 6* atomic mass of O ) u
substituting the respective atomic masses we get ,
Molecular mass of glucose ( C6 H12 O6 )
= [ 6(12.0107)+12(1.008)+6(15.9994) ]
= 180.162 u.
Q3. For moderation of the climate and body temperature of living beings, the responsible factor is:
Answer : Option B
Explaination / Solution:
Heat of vapourisation is the responsible factor.
Q4. Salvarsan has
Answer : Option C
Explaination / Solution:
It has -As=As- linkage.
Q5. 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.
Q6. 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.
Q7. Elements in which apart from 3s and 3p orbitals, 3d orbitals also available for bonding In a number of compounds of these elements there are more than eight valence electrons around the central atom. One such example is
Answer : Option D
Explaination / Solution:
In , S has more than 8 electrons in valence shell.It has 12 electrons in its valence shell.
Q8. 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.
Q9. A known mass of an organic compound is heated with fuming nitric acid in the presence of silver nitrate is:
Answer : Option B
Explaination / Solution:
This is known as carius method.
Q10. When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
Answer : Option B
Explaination / Solution:
The color of solution is due to the presence of ammoniated electron.
