Which of the following is/are the factors that affect the corrosion resistance of steel in concentrated sulfuric acid?

Which of the following is/are the factors that affect the corrosion resistance of steel in concentrated sulfuric acid? Correct Answer High velocity, temperature, and aeration

High velocity, the temperature of acid and aeration are the factors that affect the corrosion resistance of steel in concentrated sulfuric acid (>70%).

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A stock solution of 12.0 M sulfuric acid is made available. What is the best procedure to make up 100. mL of 4.0 M sulfuric acid using the stock solution and water prior to mixing?
Acid rain is any form of precipitation with high levels of nitric and sulfuric acids. It can also occurs in the form of snow,fog and tiny bits of dry materials that settle on the ground. rotting vegetation and erupting volcanoes release some chemicals that causes acid rain but majority is because of the human activities such as burning of fossil fuels, factories and auto mobiles. Acid rain has many ecological effects, few of which are given below. Which of the following, if true, would weaken the conclusion about the effects of acid rain on the environment? 
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