Your answers are shown below: 1. For a reaction A + 2B→C, rate is given by r = K[A][B]2 The order of reaction is : 7 6 3correct 5 Question was not answered 2. In the reaction 2 A + B → A2 B, if the concentration of A is doubled and that of B is halved, then the rate of reaction will Increase 2 timescorrect Decrease 2 times Increase 4 times Remain the same Question was not answered 3. The half-life of a first order reaction having rate constant K = 1.7 × 10–5s–1 is 9.7 h 12.1 h 1.8 h 11.3 hcorrect Question was not answered 4. The order of a reaction is said to be 2 with respect to a reactant X, when The reaction occurs in two steps The rate of the reaction is proportional to [X] The rate of the reaction is proportional [X]2correct Two molecules of X are present in the stoichiometric equation Question was not answered 5. A first order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed 7.5 hourscorrect 10 hours 5 hours 20 hours Question was not answered 6. If the temperature is increased by 10ºC the rate of the reaction becomes Ten times less Two times less Ten times more Two times morecorrect Question was not answered 7. Half life period of second order reaction is Proportional to the initial concentration of reactants Inversely proportional to square of initial concentration of reactants Inversely proportional to initial concentration of reactantscorrect Independent of the initial concentration of reactants Question was not answered 8. Select the incorrect statement. Reaction is a result of collision between the molecules Rate of reaction for a bimolecular elementary reaction is rate = \displaystyle {{Z}_{{AB}}}{{e}^{{-{{E}_{a}}/RT}}}$ Collision theory is based on kinetic theory of gases Collision frequency is the number of collision per second per unit lengthcorrect Question was not answered 9. In a reaction, 2x→y, the concentration of x decreases from 3.0 M to 1.5 M in 4 min. The rate of the reaction is 3.75 × 10–1M min–1 0.187 M min–1correct 1.87 M min–1 0.75 M min–1 Question was not answered 10. During a chemical reaction with increase in time, rate of a reaction decreasescorrect show irregular trends remains constant increases Question was not answered 11. Rate constant depends on Initial concentration Time None of these Temperaturecorrect Question was not answered 12. Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ? NO, HNO3, NH4Cl, N2 HNO3, NH4Cl, NO, N2 HNO3, NO, NH4Cl, N2 HNO3, NO, N2, NH4Clcorrect Question was not answered 13. When a reaction is progressing The rate of the reaction goes on increasing The concentration of the products goes on decreasing The concentration of the reactants goes on decreasingcorrect The reaction rate always remains constant Question was not answered 14. Inversion of sucrose is Zero order reaction Second order reaction Third order reaction First order reaction correct Question was not answered 15. A first order reaction has a half-life period of 96.3 sec. At 0.10 mol litre–1 reactant concentration, rate will be : 10–4 M sec–1 10–1 M sec–1 6.93 × 10–1 M sec–1 10–3 M sec–1correct Question was not answered © 2002 - 2019 Chemistry Classes, Gurugram, INDIA Terms & Conditions | Privacy Policy