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Byju's Answer

Standard XII

Chemistry

Nomenclature of Carbonyls

Statements: S...

Question

Statements: Some houses are offices. Some offices are schools.
Conclusions:
I. Some schools are houses.
II. Some offices are houses.
III. No house is school.
IV. Some schools are offices.

Only II and III follow

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Only I and IV follow

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Only either III or IV, and I follow

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Only II and IV and either I or III follow.

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Solution

The correct option is C Only II and IV and either I or III follow.
Since both the premises are particular, no definite conclusion follows. However, I and III involve only the extreme terms and form a complementary pair. So, either I or III follows. II is the converse of the first premise while IV is the converse of the second premise. Thus, both of them hold.

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Similar questions

Q. In each of the following questions two statements followed by four conclusions numbered I, II, III and IV are given, You have to take the two given statements to take true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the statements.

Statements
Some houses are offices.
Some offices are schools.

Conclusions
I. Some schools are houses.
II. Some offices are houses.
III. No house is school.
IV. Some schools are offices.

Statements:
Some flowers are rods.
Some rods are doors.
Some doors are houses.

Conclusions:
I. Some houses are flowers.
II. Some doors are flowers.
III. Some flowers are doors.
IV. No house is flower.

Statements:

Some walls are benches.

All benches are houses.

Some houses are jungles.

All jungles are roads.

Conclusions:

I. Some roads are walls.

II. Some jungles are benches.

III. Some houses are walls.

IV. Some roads are houses.

Statements

Some forests are houses.

All houses are trees.

Some trees are hills.

All hills are buses.

Conclusions

I. Some buses are trees.

II. Some trees are forests.

III. Some hills are forests.

IV. Some buses are houses.

Statement

All houses are stations

No station is a garden

Some gardens are rivers

All rivers are ponds

Conclusions

I. Some ponds are gardens

II. Some ponds are houses

III. Some ponds are stations

IV. No pond is a house.

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Statements: Some houses are offices. Some offices are schools.Conclusions:I. Some schools are houses.II. Some offices are houses.III. No house is school.IV. Some schools are offices.

Statements: Some houses are offices. Some offices are schools.
Conclusions:
I. Some schools are houses.
II. Some offices are houses.
III. No house is school.
IV. Some schools are offices.