Chemistry : Chemical Kinetics

A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will

• remain unchanged

• triple

• increase by a factor of 4

• increase by a factor of 4

In the transformation of  , if one emission is an α-particle, what should be the other emission(s)?

• Two β^–

• Two β^– and one β⁺

• One β^– and one γ

• One β^– and one γ

In Langmuir’s model of adsorption of a gas on a solid surface

• the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered

• the adsorption at a single site on the surface may involve multiple molecules at the same time

• the mass of gas striking a given area of the surface is proportional to the pressure of the gas

• the mass of gas striking a given area of the surface is proportional to the pressure of the gas

Rate of a reaction can be expressed by Arrhenius equation as K= Ae^-E/RT In this equation, E represents

• the energy above which all the colliding molecules will react

• the energy below which colliding molecules will not react

• the total energy of the reacting molecules at a temperature, T

• the total energy of the reacting molecules at a temperature, T

The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr
NO(g) Br₂ (g) ⇌ NOBr₂ (g)
NOBr₂ (g) NO(g)→ 2NOBr(g)
If the second step is the rate determining step, the order of the reaction with respect to NO(g) is

• 1

• 0

• 3

• 3

Hydrogen bomb is based on the principle of

• Nuclear fission

• Natural radioactivity

• Nuclear fusion

• Nuclear fusion

Consider an endothermic reaction, X → Y with the activation energies E_b and E_f for the backward and forward reactions, respectively. In general

• E_b < E_f

• E_b > E_fEb > Ef

• E_b = E_f

• E_b = E_f

A reaction involving two different reactants can never be

• Unimolecular reaction

• First order reaction

• second order reaction

• second order reaction

A schematic plot of In K_eq versus inverse of temperature for a reaction is shown below



The reaction must be

• exothermic

• endothermic

• one with negligible enthalpy change temperature

• one with negligible enthalpy change temperature

The photon of hard gamma radiation knocks a proton out of ²⁴₁₂Mg nucleus to form

• the isotope of parent nucleus

• the isobar of parent nucleus

• the nuclide
  

• the nuclide