Chemistry - Online Test
Q1. The number of possible conformational isomers of ethane is
zero
two
Explanation:
conformational isomers are obtained by rotation about a carbon-carbon single bond.This results in infinite number of momentary arrangements of atoms in space.Hence for ethane infinite number of conformations are possible.
Answer : Option A
Explaination / Solution:
conformational isomers are obtained by rotation about a carbon-carbon single bond.This results in infinite number of momentary arrangements of atoms in space.Hence for ethane infinite number of conformations are possible.
Q2. Raoult’s law states that for a solution of volatile liquids the partial pressure of each component in the solution is
Answer : Option D
Explaination / Solution:
Raoult’s law states that for a solution of volatile liquids the partial pressure of each component in the solution is directly proportional to mole fraction of component.
Q3. The electron releasing tendency of the metals, zinc, copper and silver is in the order:
Answer : Option C
Explaination / Solution:
Zinc relases electrons to copper and copper releases electron to silver therefore the electron releasing tendency of the metals, zinc, copper and silver is in the order Zn>Cu>Ag.This is on the basis of electrochemical series or metal activity series.
Q4. Brass is an example of
Answer : Option B
Explaination / Solution:
Brass is Mettalic Crystal
Q5. In the modern periodic table
Answer : Option B
Explaination / Solution:
In modern periodic table, the elements are arranged in the increasing order of their atomic number. It contains 7 horizontal rows called periods and 18 vertical columns called groups.
Q6. Formation of Buna – S, involves polymerization of
Answer : Option A
Explaination / Solution:
Buna S involves the polymerization of 1,3butadiene and styrene.
Q7. Ammonia has a higher boiling point and is less volatile because of
Answer : Option B
Explaination / Solution:
In the solid and liquid states NH3
is associated through intermolecular hydrogen bonding and therefore it
has higher boiling point and less volatile compared to other hydrides
of group 15.
Q8. The correct equation for change in enthalpy is:
Answer : Option A
Explaination / Solution:
Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Q9. The sulphide ore of iron is
Answer : Option D
Explaination / Solution:
FeS2 is iron pyrites.
Q10. Isobars are the atoms with
Answer : Option C
Explaination / Solution:
Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number.
