Assertion (A) : Cellulosic textiles can be permanently heat set.
Reason (R) : Heat setting can be performed on thermoplastic polymers which when heated under strictly controlled temperatures soften and can be made to take any shape. When cooled, they will retain the desired shape or configuration.
In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion (A) Analysis: Cellulosic Textiles Heat Setting
Assertion (A) claims that cellulosic textiles can be permanently heat set. Cellulosic textiles are made from cellulose, a natural polymer. This material is not thermoplastic. The process of permanent heat setting, as described for thermoplastics, is not applicable to cellulosic fibers in the same way. Therefore, Assertion (A) is incorrect.
Reason (R) Analysis: Thermoplastic Polymers and Heat Setting
Reason (R) accurately describes the principle of heat setting for thermoplastic polymers. These materials soften upon heating to specific temperatures and can be molded into new shapes. Upon cooling, they retain the set shape. This property is fundamental to how thermoplastic polymers behave and are processed.
Conclusion: Assertion and Reason Validity
The analysis shows:
- Assertion (A) is incorrect.
- Reason (R) is correct.
Thus, the correct choice is that (A) is not correct, but (R) is correct.
Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
