Chemistry - Online Test
Q1.
The below molecule is called
Answer : Option A
Explaination / Solution:
This polymer is polyvinylchloride.
Q2. Which gas has a smell of rotten fish?
Answer : Option C
Explaination / Solution:
Phosphine has smell like rotten fish.
Q3. Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a
Answer : Option B
Explaination / Solution:
Covalent solid doesnot conduct electricity in molten and solid state.
Q4. In Friedel-Crafts alkylation reaction, when benzene is treated with an alkyl halide in the presence of a catalyst, alkylbenene is formed. The catalyst used is
Answer : Option A
Explaination / Solution:
the acid chloride or anhydride reacts with anhydrous aluminium chloride to form the acylium ion which serves as an electrophile which then attacks the benzene ring to give alkylbenzene.
Q5. Extraction process of Bauxite is known as
Answer : Option D
Explaination / Solution:
Hall – Heroult process of extraction of Al from Bauxite.
Q6. Standard Gibbs energy change is related to the equilibrium constant of the reaction as follows:
Answer : Option D
Explaination / Solution:
= -RTln K
where is standard Gibbs energy change, K is equilibrium constant, R is universal gas constant and T is temperature in kelvin scale
Q7. In the periodic table Electronegativity generally
Answer : Option D
Explaination / Solution:
The electronegativity value increases as the effective nuclear charge on the atomic nucleus increases. In a period moving from left to right, the electronegativity increases due to decrease in atomic radii resulting an increase in effective nuclear charge. Whereas, in a group moving from top to bottom, the electronegativity decreases because atomic radius increases due to subsequent addiiton of shells.
Q8. Daltons atomic theory could not explain one of the following
Answer : Option C
Explaination / Solution:
Daltons theory said atom is indivisible in nature so it doesnot explain the existence of subatomic particles.
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions.
Q9. Reducing potentially hazardous waste through smarter productions is called :
Answer : Option D
Explaination / Solution:
Metathesis is the method developed by noble prize winning trio, Chauvin, Grubbs and Schrock. It is a method in organic synthesis in which a certain group of atoms are rearranged in a molecule so that a molecule with lesser harmful effect is produced.
Q10. Which of the following sulphides is soluble in aqua regia?
Answer : Option C
Explaination / Solution:
HgS is only soluble in aqua regia
