Question 1 : Gaseous N<sub>2</sub>O<sub>5 </sub>decomposes according to the following equation :<br>N<sub>2</sub>O<sub>5</sub>(g) → 2NO<sub>2</sub>(g) + <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799d9be89a3d2142170115' height='36' width='15' > O<sub>2</sub>(g)<br>The experimental rate law is -Δ[N<sub>2</sub>O<sub>5</sub>]/Δt = k[N<sub>2</sub>O<sub>5</sub>]. At a certain temperature the rate constant is k = 5.0 x 10<sup>-4</sup>/sec. In how seconds will the concentration of N<sub>2</sub>O<sub>5</sub> decrease to one-tenth of its initial value?<br>
Question 2 : The following mechanism has been proposed for the reaction of NO with Br<sub>2</sub> to from NOBr<sub>2</sub><br>NO(g) + Br<sub>2</sub>(g) <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799db2e89a3d214217014b' height='15' width='42' > NOBr<sub>2</sub>(g)<br>NOBr<sub>2</sub>(g) + NO(g) ―→ 2NOBr(g)<br>If the second step is the rate determining step, the order of the reaction with respect to NO(g) is<br>
Question 3 : Rate of a reaction can be expressed by Arrhenius equation as <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799e0cced10523befee680' height='29' width='105' >In the equation, E represents<br>
Question 4 :
The half - life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is :<br>
Question 5 :
In the following reaction, how is the rate of appearance of the underlined product related to the rate of disappearance of the underlined reactant?<br>$BrO_{3(aq)}^{-}+\underline {5Br^-}_{(aq)}+6H^+_{(aq)}\rightarrow \underline {3Br_{2(1)}}+3H_2O_{(1)}$
Question 6 : For a reversible reaction, A + B <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799cfaa2bddf222e0af3ab' height='16' width='11' > C+ D, the graph for rate of reaction with time is given below.<br>Mark the terms (p), (q) and (r).<br><img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799cfae89a3d214216fd98' height='105' width='107' ><br>
Question 7 :
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 be<br>
Question 8 :
The order of a reaction can be predicted with the help of ______________.<br/>
Question 9 :
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 rate of reaction will<br>
Question 10 : For reaction A + 2B <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799d55e89a3d214216ffcc' height='21' width='36' >C + D rate law R = k[A]<sup>1</sup>[B]<sup>2</sup>. By what factor would the rate changes if concentration of A is doubled & that of B is halved ?<br>
Question 11 :
Activation energy of a chemical reaction can be determined by ________<br>
Question 12 :
The rate constant of a reaction is found to be 3× 10<sup>-3</sup>mol L<sup>-1</sup> min<sup>-1</sup>. The order of the reaction is<br>
Question 13 :
The value rate constant of a pseudo first order reaction __________.<br>
Question 14 : The energies of activation for forward and reverse reactions for A2 + B<sub>2</sub><img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799d58ced10523befee45a' height='18' width='39' > 2AB are 180 kJ mol<sup>-1</sup> and 200 kJ mol<sup>-1</sup> respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol<sup>-1</sup>. The enthalpy change of the reaction (A2 + B<sub>2</sub>→ 2AB) in the presence of catalyst will be (in kJ mol<sup>-1</sup>).<br>
Question 15 :
Which of the following will result when the temperature is increased as the chemical reaction proceeds?<br>I. Increased molecular collision frequency<br>II. Increased numbers of molecules possess energy greater than the activation energy<br>III. Decreased randomness of the system
Question 16 :
The rate of the reaction, 3A + 2B → Products is given by the rate expression :Rate = k[A][B]<sup>2</sup> .If A is taken in excess, the order of the reaction would be:<br>
Question 17 : For the decomposition of HI at 1000 K (2HI → H<sub>2</sub> + I<sub>2</sub>), the following data were obtained<table><tr><td> [HI] M</td><td>Rate of decomposition of HI (mol L<sup>-1</sup>s<sup>-1</sup>)</td></tr><tr><td>0.1</td><td> 2.75 × 10<sup>-8</sup></td></tr><tr><td>0.2</td><td> 11 × 10<sup>-8</sup></td></td></tr><tr><td>0.3</td><td> 24.75 × 10<sup>-8</sup></td></tr></table>The order of reaction is :<br>
Question 18 :
75% of a first order reaction was completed in 32 minute, when was 50% of the reaction completed?<br>
Question 19 :
The rate of a gaseous reaction is halved when the volume of the vessel is doubled. The order of reaction is<br>
Question 21 :
Which of the following statements regarding molecularity of the reaction is correct?<br/><br/>
Question 22 :
Activation energy of a chemical reaction can be determined by -<br>
Question 23 :
The order and molecularity of the chain reaction, ${ H }_{ 2 }\left( g \right) +{ Cl }_{ 2 }\left( g \right) \xrightarrow [ ]{ \quad hv\quad } 2HCl\left( g \right) $, are:
Question 25 :
If the rate expression for a reaction is $\dfrac { dx }{ dt } =k{ \left[ A \right] }^{ { 1 }/{ 2 } }{ \left[ B \right] }^{ { 3 }/{ 2 } }$, the overall order of the reaction is:
Question 26 : The minus sign in rate <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799cfcced10523befee218' height='41' width='51' >indicates the _____ in concentration of the _____with time. The rate of a reaction is always _____ quantity. The rate of reaction increases with ______ in concentration of reactants, the blanks in the questions corresponds to<br>
Question 27 :
The rate constant for a first order reaction whose half-life, is 480 seconds is -<br>
Question 28 :
For a reaction A + B → C + D, if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of the reaction is:<br>
Question 29 :
For the reaction A + 2B → C, rate is given by R = [A] [B]2 then the order of the reaction is :<br>
Question 30 :
The activation energy of a reaction is zero. The rate constant of the reaction -<br>
Question 31 :
The rate constant of a first order reaction is 10<sup>-3</sup> min<sup>-1</sup> at 300 K. The temperature coefficient of the reaction is 2. What is the rate constant of the reaction at 350 K approximately ?<br>
Question 32 :
Which of the following statement is not correct for the catalyst?<br>
Question 33 :
For a chemical reaction X ―→ Y, the rate of reaction increases by a factor 1.837 when the concentration of X is increased by 1.5 times. The order of the reaction with respect to X is<br>
Question 34 :
A certain zero order reaction has k = 0.025 M s<sup>-1</sup> for the disappearance of A. What will be the concentration of A after 15 seconds if the initial concentration is 0.5 M?<br>
Question 35 : The rate equation for the reaction 2A + B <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799dbde89a3d2142170165' height='21' width='43' > C is found to be: rate = k[A] [B]. The correct statement in relation to this reaction is that the :<br>
Question 36 :
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 be
Question 37 :
A zero order reaction is one in which the rate of the reaction is independent of ______________.<br/>
Question 38 : The first order rate constant for the decomposition of <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799d6ae89a3d2142170066' height='20' width='36' >is <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799d6aced10523befee4d4' height='19' width='89' >. The half-life period for this decomposition in seconds is<br>
Question 39 :
The rate constants of a reaction at 300K & 280K respectively are $K_1 $&$K_2$. Then:
Question 40 :
In the respect of the equation k = Ae<sup>-Ea/RT</sup> in chemical kinetics, which one of the following statements is correct :<br>
Question 41 : For the reaction <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e799dfbe89a3d21421701f3' height='29' width='98' > rate is given by R = [A][B]<sup>2</sup> than the order of the reaction is
Question 42 : The experimental data for the reaction,<br>2A + B<sub>2</sub>→ 2AB, is <br><table><tr><td>Expt.</td><td> [A]</td><td> [B<sub>2</sub>]</td><td> Rate (s<sup>-1</sup>)</td></tr><tr><td>1.</td><td> 0.50</td><td> 0.50</td><td> 1.6×10<sup>-4</sup></td></tr><tr><td>2.</td><td> 0.50</td><td> 1.00</td><td> 3.2× 10<sup>-4</sup></td></tr><tr><td>3.</td><td> 1.0</td><td> 1.00</td><td> 3.2×10<sup>-4</sup></td></tr></table>The rate equation for the above data is -<br>
Question 43 :
For the reaction system 2NO (g) + O<sub>2</sub>(g) ―→ 2NO<sub>2</sub>(g) Volume is suddenly reduced to half its value by increasing the pressure on it. If the reaction is of first order with respect to O<sub>2</sub> and second order with respect to NO, the rate of reaction will -<br>
Question 44 :
The number of molecules of the reactants taking part in a single step of the reaction tells about:
Question 45 :
The value of rate of pseudo first order reaction depends upon<br>
Question 46 :
The following mechanism has been proposed for a reaction:<br/>$A+B\rightarrow C+D$ (Slow)<br/>$A+C \rightarrow E $ (Fast)<br/>$2A+ B\rightarrow D+ E$<br/>The rate law expression for the reaction is:<br/>
Question 47 :
For a reaction; $X + Y\rightarrow Z, rate \propto [X]$. What is (i) molecularity and (ii) order of the reaction?
Question 48 :
The rate law for a reaction between substances A and B is given by $ Rate=k[A]^{n} [B]^{m}$ On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of reaction will be:<br/>
Question 49 :
Which of the following statements regarding molecularity of the reaction is wrong?
Question 50 :
The half-life of a first-order reaction is equal to $4.459\ seconds$. Determine the rate constant of the reaction in $min^{-1}$.
