JEE & NEETNEET Chemistry NEET Chemistry MCQ 100+ MCQ & Answer | Page-04 February 4, 2025 DSN MARATHI 31. Ziegler Natta catalyst is associated with _____. A. hydrogenation of alkenes B. hydroformylation of alkenes C. polymerisation of alkenes D. none of the above Answer Option : C 32. Which of the following is incorrect for a catalyst? A. Catalyst does not start a reaction B. Co-enzymes increase the activity of an enzyme C. Bio-chemical reactions are mostly catalysed by enzymes D. Catalyst changes the equilibrium constant of a reaction Answer Option : D 33. Which of the following is incorrect for enzymes? A. Enzymes are specific B. Most of the enzymes are protein C. Reactivity of enzymes is least at optimum temperature D. High temperature and UV rays can denature enzymes Answer Option : C 34. Which of the following enzymes catalyses the hydrolysis of triglycerides to fatty acids and glycerol? A. Lipase B. Maltase C. Pepsin D. Zymase Answer Option : A 35. Which of the following is changed in a chemical reaction due to a catalyst? A. Entropy B. Enthalpy C. Internal energy D. Activation energy Answer Option : D 36. What is the effect of enzymes on the rate of biochemical reactions? A. The rate increases B. The rate decreases C. It does not change D. None of the above Answer Option : A 37. How does a catalyst increase the rate of a reaction? A. By increasing activation energy B. By forming an intermediate complex C. By lowering the activation energy D. By changing equilibrium constant Answer Option : C 38. Molecules are held together in a crystal by _______. A. hydrogen bond B. electrostatic attraction C. dipole-dipole attraction D. van der Waal’s attraction Answer Option : D 39. The value of equilibrium constant for different chemical reactions at a particular temperature is _______. A. constant B. unique C. the same D. cannot say Answer Option : B 40. If the initial concentrations of reactants in a reaction increase then the equilibrium constant ______. A. increases B. decreases C. remains constant D. may increase or decrease Answer Option : C
31. Ziegler Natta catalyst is associated with _____. A. hydrogenation of alkenes B. hydroformylation of alkenes C. polymerisation of alkenes D. none of the above Answer Option : C
32. Which of the following is incorrect for a catalyst? A. Catalyst does not start a reaction B. Co-enzymes increase the activity of an enzyme C. Bio-chemical reactions are mostly catalysed by enzymes D. Catalyst changes the equilibrium constant of a reaction Answer Option : D
33. Which of the following is incorrect for enzymes? A. Enzymes are specific B. Most of the enzymes are protein C. Reactivity of enzymes is least at optimum temperature D. High temperature and UV rays can denature enzymes Answer Option : C
34. Which of the following enzymes catalyses the hydrolysis of triglycerides to fatty acids and glycerol? A. Lipase B. Maltase C. Pepsin D. Zymase Answer Option : A
35. Which of the following is changed in a chemical reaction due to a catalyst? A. Entropy B. Enthalpy C. Internal energy D. Activation energy Answer Option : D
36. What is the effect of enzymes on the rate of biochemical reactions? A. The rate increases B. The rate decreases C. It does not change D. None of the above Answer Option : A
37. How does a catalyst increase the rate of a reaction? A. By increasing activation energy B. By forming an intermediate complex C. By lowering the activation energy D. By changing equilibrium constant Answer Option : C
38. Molecules are held together in a crystal by _______. A. hydrogen bond B. electrostatic attraction C. dipole-dipole attraction D. van der Waal’s attraction Answer Option : D
39. The value of equilibrium constant for different chemical reactions at a particular temperature is _______. A. constant B. unique C. the same D. cannot say Answer Option : B
40. If the initial concentrations of reactants in a reaction increase then the equilibrium constant ______. A. increases B. decreases C. remains constant D. may increase or decrease Answer Option : C
