statement c, that is, he varies the nitrogen and carbon dioxide levels in the air from one trial to the next would represent a scientific mistake in his experiment.
the hypothesis of malik was regarding the influence of increased oxygen level on the growth of the red-legged grasshoppers. thus, the areas of his experiment should be the type of grasshopper, the rate of growth of grasshopper, and a high level of oxygen. therefore, all the given options are relevant to his experiment, except option c.
let us consider each statement one by one
a) catalysts are the substance which alter the reaction pathway where activation energy of reaction is less that the un catalyzed reaction. they are not used up in the reaction . the catalyst is restored in the reaction.
b) as mentioned above, the catalyst speed up reaction by lowering the activation energy
c) during a reaction the reactants are consumed up and products are formed. so there is a decrease in concentration of reactant.
thus all the above statements are true.
d) the rate of decrease in concentration of reactants depends upon the coefficient of reactant in balanced chemical reaction.
here the rate of decrease in concentration of hydrogen will be double the rate of decrease in concentration of oxygen.
28800 quarts per hour