Chemistry Practice MCQ Page 50

Multiple Choice questions for Chemistry in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 3381   Energy of activation is usually expressed in
  1. joules
  2. calories
  3. ergs
  4. newtons
Question: 3382   When the products are in lower energy state than the reactants, the reaction is
  1. stable
  2. endothermic
  3. at equilibrium
  4. exothermic
Question: 3383   The rate constants of chemical reactions are strongly influenced by
  1. catalyst
  2. temperature
  3. nature and concentration of reactants
  4. by all of them
Question: 3384   In the exothermic reactions, the products are at energy level
  1. higher than reactant
  2. lower than reactant
  3. equal to reactants
  4. away from reactants
Question: 3385   Activation energy is the energy barrier for the formation of
  1. activation complex
  2. intermediates
  3. reactants
  4. products
Question: 3386   the nature of the reactant effects the
  1. nature of product
  2. activation energy
  3. rate of reaction
  4. heat of the reaction
Question: 3388   The rate of a chemical reaction is proportional a to the product of molar concentrations of the
  1. products
  2. reacting species
  3. intermediates
  4. all species
Question: 3389   Similar substance can have different reaction rates under
  1. same conditions
  2. different conditions
  3. various conditions
  4. ideal conditions
Question: 3390   Ir respect of the fact that a chemical reaction is exo- or endo-thermic, the increase in temperature, increases the
  1. potential energy
  2. collisions
  3. reaction rate
  4. kinetic energy
Question: 3391   greater the number of molecules of the reacting substances per unit volume greater will be the
  1. collisions
  2. reaction rate
  3. energy losses
  4. product formed
Question: 3392   generally rise of 10°C of the temperature of a reaction system, the reaction rate
  1. increases
  2. doubles
  3. subsides
  4. drops
Question: 3393   The minimum amount of energy in addition to the average energy, which is just sufficient to convert reactants to products, is called
  1. internal energy
  2. dissipation energy
  3. enthalpy
  4. activation energy