Liquid petrol does not ignite spontaneously when exposed to the air because
(A)The ΔH for the combustion of petrol is positive
(B) Reaction between petrol and oxygen requires a catalyst
(C) The reactants are in different physical states
(D) Not enough molecules possess sufficient energy to react
Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
A cant be bcoz combustion of petrol gaives deltaH is as -ve
c option is reactant are in different phase doesn't make any sense bcoz water and Sodium metal reacts spontaneously even they are in different phases...
confusing B and D
i can say for a spark as a catalyst or for a matchstick as catalyst
but is it worthwhile to say them as catalyst...?
once spark is supplied for them, there is no need of spark :)
Here both of these materials start the reaction but according to the definition of catalyst
it only alters the rate of reaction mean increases the rate of reaction..
so the D will be better option
D is the answer B is not because catalyst is a substance that speeds up a reaction by lowering the activation energy since no catalyst are used in this reaction so D is the answer and @chmvijay spark or match stick provide the activation energy for the reaction not lower it so they are not catalysts