Aluminum is: Select one: O a. the second most common metal in the lithosphere. O

Question

Aluminum is: Select one: O a. the second most common metal in the lithosphere. O b. the most common element in the lithosphere c.the most common metal in the lithosphere O d. the second most common element in the lithosphere The process by which hydrazine (rocket fuel) is synthesized is the: Select one: Oa. Haber-Bosch process O b. Ostwald process c. Van't Hoff process d. Raschig process O Which of the following nitrogen-containing compounds can be used to reduce the level of chlorine in wastewater? Select one: a.NH3 O c. N2 O d. NO2

Explanation / Answer

By mass, aluminium makes 8% of the Earth's crust; it is the third most abundant element after oxygen and silicon and it is the most abundant metal in the crust.

So the answer will be c.the most common metal in the lithosphere.

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d Raschig Process

By using Raschig process hydrazine is synthesized.

NH2Cl + NH3 H2NNH2 + HCl

Hydrazine is produced using sodium hypochlorite and ammonia.This reaction is known as Olin-Raschig reaction.

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a. NH3

NH3 is used to reduce level of free chlorine in waste water by reacting with chlorine to form Chloramine.

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