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Class 12 Exam  >  Class 12 Questions  >  Which is not correct? a)In an exothermic reac... Start Learning for Free
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Which is not correct?    
  • a)
    In an exothermic reaction, the enthapy of products is less than that of reactants    
  • b)
  • c)
    A reaction for which ΔH0 < 0 and ΔS0 > 0 is possible at all temperatures    
  • d)
    ΔH is less than ΔU for the reaction,        
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which is not correct? a)In an exothermic reaction, the enthapy of prod...
ΔH = ΔU + ΔnRT
Δn = +1/2
Thus,ΔH>ΔU
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Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.In the following questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion: For a reaction: P + 2Q → Products, Rate = k [P]1/2[Q]1 so the order of reaction is 1.5Reason: Order of reaction is the sum of stoichiometric coefficients of the reactants.

Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.In the following questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion: Reactions can occur at different speeds.Reason: Rate of reaction is also called speed of reaction.

Which is not correct? a)In an exothermic reaction, the enthapy of products is less than that of reactants b)c)A reaction for whichΔH0 < 0 andΔS0 > 0 is possible at all temperatures d)ΔH is less thanΔUfor the reaction, Correct answer is option 'D'. Can you explain this answer?
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Which is not correct? a)In an exothermic reaction, the enthapy of products is less than that of reactants b)c)A reaction for whichΔH0 < 0 andΔS0 > 0 is possible at all temperatures d)ΔH is less thanΔUfor the reaction, Correct answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which is not correct? a)In an exothermic reaction, the enthapy of products is less than that of reactants b)c)A reaction for whichΔH0 < 0 andΔS0 > 0 is possible at all temperatures d)ΔH is less thanΔUfor the reaction, Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which is not correct? a)In an exothermic reaction, the enthapy of products is less than that of reactants b)c)A reaction for whichΔH0 < 0 andΔS0 > 0 is possible at all temperatures d)ΔH is less thanΔUfor the reaction, Correct answer is option 'D'. Can you explain this answer?.
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