Question

O, S , Se , Te elements are collectively known as chalcogens ( ore
forming) . Most of the metals are oxides and sulphides. O and S are
non metals; Se and Te are metalloids and Po is a metal. Oxygen is the
most abundant element present in atmosphere, constituting 20.46 %
by volume and 23% by mass. Compounds of oxygen are more ionic
than those of other elements, when a slow dry steam of oxygen is
passed through a silent electrical discharge dinner special type of
apparatus called ozonizer. The product is known as ozonised oxygen.
3 O2. ==> 2 O3 ∆Ho
(298 K)= +68 kcal.
The mixture obtained ( having 5 to 10% ozone by volume) is called
ozonised oxygen.
In the following questions, a statement of assertion followed by a
statement of reason is given. Choose the correct answer out of the
following choices.
(a) assertion and reason both are correct statements and reason is
correct explanation for assertion.
(b) assertion and reason both are correct statements but reason is not
correct explanation for assertion.
(c) assertion is correct statement but reason is wrong statement.
(d) assertion is wrong statement but reason is correct statement.
(i) assertion : the oxygen bond length in ozone is identical with that in
molecular oxygen.
Reason: the ozone molecule is a resonance hybrid of two canonical
structure.
(ii) assertion: bahut rhombic and monoclinic sulphur exist as S8 but
oxygen O2.
Reason: oxygen forms pπ pπ multiple bond due to small size and small
bond length but pπ pπ bonding is not possible in Sulphur.
(iii) assertion: ozone has a destructive action on body tissue.
Reason: ozone is a dangerous gas.
(iv) assertion: ozone is thermodynamically unstable.
Reason: it is decomposition into oxygen results in liberation of heat
and increase in entropy.O, S , Se , Te elements are collectively known as chalcogens ( ore
forming) . Most of the metals are oxides and sulphides. O and S are
non metals; Se and Te are metalloids and Po is a metal. Oxygen is the
most abundant element present in atmosphere, constituting 20.46 %
by volume and 23% by mass. Compounds of oxygen are more ionic
than those of other elements, when a slow dry steam of oxygen is
passed through a silent electrical discharge dinner special type of
apparatus called ozonizer. The product is known as ozonised oxygen.
3 O2. ==> 2 O3 ∆Ho
(298 K)= +68 kcal.
The mixture obtained ( having 5 to 10% ozone by volume) is called
ozonised oxygen.
In the following questions, a statement of assertion followed by a
statement of reason is given. Choose the correct answer out of the
following choices.
(a) assertion and reason both are correct statements and reason is
correct explanation for assertion.
(b) assertion and reason both are correct statements but reason is not
correct explanation for assertion.
(c) assertion is correct statement but reason is wrong statement.
(d) assertion is wrong statement but reason is correct statement.
(i) assertion : the oxygen bond length in ozone is identical with that in
molecular oxygen.
Reason: the ozone molecule is a resonance hybrid of two canonical
structure.
(ii) assertion: bahut rhombic and monoclinic sulphur exist as S8 but
oxygen O2.
Reason: oxygen forms pπ pπ multiple bond due to small size and small
bond length but pπ pπ bonding is not possible in Sulphur.
(iii) assertion: ozone has a destructive action on body tissue.
Reason: ozone is a dangerous gas.
(iv) assertion: ozone is thermodynamically unstable.
Reason: it is decomposition into oxygen results in liberation of heat
and increase in entropy.

Answer 1

Answer:

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