4701. __________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).
Unsaturated polyester
Alkyd resins
Saturated polyester
Amino resins
✅ The correct answer is option B.
Chemical Engineering
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4702. Thermosetting plastic materials
can be repeatedly melted.
is useful for melt casting.
can not be melted after forming.
is useful for spinning.
✅ The correct answer is option C.
4703. __________ is an addition polymer
Nylon
Bakelite
Polythene
none of these
✅ The correct answer is option C.
4704. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
5°C and 1 kgf/cm2.
– 20°C and 1 kgf/cm2.
0°C and 1 kgf/cm2.
0°C and 3 kgf/cm2.
✅ The correct answer is option A.
4705. The free energy change for a chemical reaction is given by (where, K = equilibrium constant)
A. RT lnK
B. -RT lnK
C. -R lnK
D. T lnK
✅ The correct answer is option B.
4706. Equilibrium constant decreases as the temperature
A. Increases, for an exothermic reaction
B. Decreases, for an exothermic reaction
C. Increases, for an endothermic reaction
D. None of these
✅ The correct answer is option A.
4707. The total change in the enthalpy of a system is independent of the
A. Number of intermediate chemical reactions involved
B. Pressure and temperature
C. State of combination and aggregation in the beginning and at the end of the reaction
D. None of these
✅ The correct answer is option A.
4708. The energy of activation of exothermic reaction is
A. Zero
B. Negative
C. Very large compared to that for en-dothermic reaction
D. Not possible to predict
✅ The correct answer is option D.
4709. The expression for entropy change given by, ΔS = – nR ln (P₂/P₁), holds good for
A. Expansion of a real gas
B. Reversible isothermal volume change
C. Heating of an ideal gas
D. Cooling of a real gas
✅ The correct answer is option B.
4710. Polymethyl methacrylate (PMMA) is known as
bakelite
teflon
perspex
nylon-6
✅ The correct answer is option C.