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Engineering
100 Views   |

The rate law for a reaction between the substances $\dpi{100} A$ and $\dpi{100} B$  is given by rate = $\dpi{100} k\left [ A \right ]^{n}\left [ B \right ]^{m}.$

On doubling the concentration of $\dpi{100} A$ and halving the concentration of $\dpi{100} B$ , the ratio of the new rate to the earlier rate of the reaction will be as

• Option 1)

$\frac{1}{2^{m+n}}\; \; \;$

• Option 2)

$(m+n)\; \;$

• Option 3)

$\; (n-m)\; \;$

• Option 4)

$\; 2^{(n-m)}$

As we learnt in  Rate of Law = Dependence of Rate on Concentration - The representation of rate of a reaction in terms of concentration of the reactants is known as Rate Law or The Rate Law is the expression in which reaction rate is given in terms of molar concentration of reactants with each term raised to some power, which may/maynot be equal to stoichiometric of the reacting species in a...
Engineering
97 Views   |

For the reaction system:

$\dpi{100} 2NO_{(g)}+O_{2(g)}\rightarrow 2NO_{2(g)}$ ,

volume is suddenly reduced to half its value by increasing the pressure on it. If the reaction is of first order with respect to $\dpi{100} O_{2}$  and second order with respect to $\dpi{100} NO_{2}$ , the rate of reaction will

• Option 1)

diminish to one-­fourth of its initial value

• Option 2)

diminish to one­-eighth of its initial value

• Option 3)

increase to eight times of its initial value

• Option 4)

increase to four times of its initial value

As we learnt in  Rate of Law = Dependence of Rate on Concentration - The representation of rate of a reaction in terms of concentration of the reactants is known as Rate Law or The Rate Law is the expression in which reaction rate is given in terms of molar concentration of reactants with each term raised to some power, which may/maynot be equal to stoichiometric of the reacting species in a...
Engineering
119 Views   |

In the respect of the equation $\dpi{100} k=Ae^{-E_{a}/RT}$  in chemical kinetics, which one of the following statements is correct?

• Option 1)

$k$ is equilibrium constant

• Option 2)

$A$  is adsorption factor

• Option 3)

$E_{a}$ is energy of activation

• Option 4)

$R$  is Rydberg constant.

As we learnt in  Arrhenius Equation - Arrhenius gave the quantitative dependence of rate constant on temperature by the Arrhenius equation. - wherein = Rate constant     Where A is Pre-exponential factor K=Rate constant R=Gas constant T=Absolute temprerature =Activation Energy Option 1) is equilibrium constant Incorrect Option Option 2)   is adsorption factor Incorrect Option Option 3) ...
Engineering
344 Views   |

The half­-life of a radioactive isotope is three hours. If the initial mass of the iosotope were 256 g, the mass of it remaining undecayed after 18 hours would be

• Option 1)

4.0 g

• Option 2)

8.0 g

• Option 3)

12.0 g

• Option 4)

16.0 g.

As we learnt in concept First Order Reaction - The rate of the reaction is proportional to the first power of the concentration of the reaction - wherein Formula: R            P a                 0 a-x             x   [differentiate rate law] Unit of        X = 4 gm  Option 1) 4.0 g This option is correct.  Option 2) 8.0 g This option is incorrect.  Option 3) 12.0 g This option is...
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