(A) Urea formaldehyde resin can be reused again even on strong heating.
(R) Urea formaldehyde resin is a Thermo-plastic polymer.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is D.

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Detailed Solution

Urea formaldehyde resin is a thermosetting polymer, which means that it undergoes a chemical reaction during its formation, resulting in cross-linking between its polymer chains.
As a result, it becomes infusible and cannot be reshaped or re-molded by heating.
Therefore, the assertion (A) that urea formaldehyde resin can be reused again even on strong heating is incorrect.
The reason (R) is also incorrect because thermoplastic polymers can be melted and reshaped upon heating.
However, urea formaldehyde resin is a thermosetting polymer, which means that it cannot be reshaped by heating.
In conclusion, both the assertion (A) and the reason (R) are incorrect.

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