21. All enzymes that use ATP for phosphate transfer require it as a cofactor.
Answer: Magnesium
22. Borax is:
Answer: Na₂B₄O₇.10H₂O
23. Under isothermal conditions, __________ = 0 for an irreversible process.
Answer: ΔU
24. ZSM-5 (a type of zeolite) is used to convert directly into gasoline.
Answer: Amine
25. Methoxypropane and Ethoxyethane are represented by:
Answer: Tautomerism
26. A jug contains 2 L of milk. Find the volume of milk in m³.
Answer: 2×10⁻³ m³
27. The molarity of NaOH in solution is made by dissolving 4 grams of it in enough water to make 250 mL of solution.
Answer: 4 M
28. 99.985% of hydrogen atoms have only one proton. This isotope is called:
Answer: Protium (H)
29. When radiation falls on a metallic surface, electrons are ejected. This phenomenon is called:
Answer: Photoelectric effect
30. Which of the following has the most alkaline nature?
Answer: Na₂O
31. Sodium fusion extract is acidified with acetic acid and then lead acetate is added. The presence of a black precipitate of lead sulfide indicates:
Answer: Sulfur
32. For a solution, the partial vapor pressure of each volatile component is directly proportional to its:
Answer: Mole fraction
33. Two solutions having the same osmotic pressure at a given temperature are called:
Answer: Isotonic solutions
34. The unit of the rate constant for a first-order reaction is:
Answer: s-1
35. The decomposition of gaseous ammonia on a hot platinum surface at high pressure is a reaction of:
Answer: Zero order
36. Commercial fibers like Orlon or Acrilan are used as a substitute for wool.
Answer: Polyacrylonitrile
37. Neoprene is formed by free radical polymerization of:
Answer: Chloroprene
38. Obtained by copolymerization of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid:
Answer: PHBV
39. Used in the manufacture of paints and varnishes:
Answer: Glyptal
40. Excess of this in drinking water can cause diseases like Blue Baby Syndrome:
Answer: Nitrate