Topic Question Set
Q 1
:
Assertion: Catenation is shown by carbon.
Reason: Catenation is not shown by carbon because it has valency of 5.
Reason: Catenation is not shown by carbon because it has valency of 5.
Assertion and reason both are true and reason is the correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(3)
Catenation is shown by carbon because it has valency of 4 and thus it can form large number of compounds by sharing its 4 valence electrons with other atoms of carbon or with atoms of other elements.
Q 2
:
Assertion: Carbon forms ionic compounds.
Reason: It is because of its valency of 4.
Reason: It is because of its valency of 4.
Assertion and reason both are true and reason is the correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(4)
Carbon forms covalent compounds because of its valency of 4, it is tetravalent in nature due to which it can share its 4 electrons easily.
Q 3
:
Assertion: Mass number of a carbon is 12.
Reason: Carbon possesses equal number of all three fundamental particles.
Reason: Carbon possesses equal number of all three fundamental particles.
Assertion and reason both are true and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(2)
Number of electrons, protons and neutrons in carbon are equal, i.e.; 6. The mass number of carbon is 12.
Q 4
:
Assertion: Covalent compounds are poor conductors of electricity.
Reason: It is because they do not form the ions.
Reason: It is because they do not form the ions.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(1)
Covalent compounds are poor conductors of electricity because they do not form the ions.
Q 5
:
Assertion: Carbon and its compounds are used as fuels.
Reason: They give lot of heat and light when burnt in air.
Reason: They give lot of heat and light when burnt in air.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(1)
Carbon and its compounds are used as fuels for most applications because most of the carbon compounds give a lot of heat and light when burnt in air. Saturated hydrocarbons burn with a clean flame and no smoke is produced. The carbon compounds, used as a fuel, have high calorific values.
Q 6
:
Assertion: General formula of alkanes is
Reason: It is because they are saturated compounds.
Reason: It is because they are saturated compounds.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(2)
Alkanes are saturated compounds because they are very stable. Thus, both assertion and reason are correct but reason is not the correct explanation of the assertion.
Q 7
:
Assertion: Following are the members of a homologous series:
Reason: A series of compounds with same functional group but differing by unit is called a homologous series.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(1)
The Homologous series of the compounds differ by units and molecular mass of each member differs by 14 amu.
Q 8
:
Assertion: In a homologous series of alcohols, the formula for the second member is and the third member is.
Reason: The difference between the molecular masses of the two consecutive members of a homologous series is 144.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(3)
In homologous series, two consecutive members differ by and differ in molecular masses by 14. Thus, assertion is true but reason is false.
Q 9
:
Assertion: For welding purpose a mixture of oxygen and ethyne is used.
Reason: Ethyne when burnt in air gives smoky flame.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(3)
When ethyne is burnt in air, due to incomplete combustion it gives a sooty flame. But when ethyne is burnt with oxygen, it gives a clean flame with temperature of 3000°C.
Q 10
:
Assertion: Detergents are better cleansing agent than soaps.
Reason: It is because they work with soft water.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(3)
Detergents are better cleansing agents than soaps because they can work both in hard and soft water.
