PVC's rigidity in its unplasticized form is due to:
A. Polar C-Cl bonds causing intermolecular attractions
B. Strong hydrogen bonding
C. High molecular weight only
D. Covalent cross-links
Answer: Option A
Solution (By JKSSB Mock Tests)
PVC has polar C-Cl bonds; the chlorine atoms create dipole-dipole interactions between polymer chains, restricting chain movement and making the material rigid and strong. Adding plasticizers (e.g., phthalates) reduces intermolecular forces, making it flexible. Cross-links are in thermosets, PVC is thermoplastic. High molecular weight contributes but polarity is key.
Explanation:
Amylase is an enzyme (biological catalyst) that breaks down starch. Platinum, V₂O₅, and iron are inorganic chemical catalysts. Enzymes are proteins, highly specific, and work under mild conditions.
Explanation:
Liquefied Petroleum Gas (LPG) consists primarily of propane (C₃H₈) and butane (C₄H₁₀) liquefied under pressure. A strong-smelling mercaptan is added as odorant to detect leaks. CNG is mainly methane. LPG is used for cooking and as automotive fuel (autogas). It has higher calorific value than natural gas. It is heavier than air, so it settles in low areas, posing a safety hazard if leaked.
Consider the following statements: 1. Chromatography separates components based on differential adsorption. 2. The component that is more strongly adsorbed moves faster. Which statement(s) is/are correct?
Explanation:
Chromatography is an advanced technique used to separate mixtures based on the differential adsorption of components onto a stationary phase. The component that is more strongly adsorbed to the stationary phase moves slower, not faster. Therefore, only statement 1 is correct, making option A the right choice.
No comments yet. Be the first to start the discussion!