Answer:
(d) Why is the fuel cell in Question (c) described as an alkaline fuel cell? (e) Another type of fuel cell uses methanol instead of hydrogen.
Explanation:
Answer :
The balanced chemical reaction is,

From this balanced chemical reaction, we conclude that
2 moles of iron oxide react with the 3 moles of carbon to give 4 moles of iron and 3 moles of carbon dioxide.
Therefore, the valid mole ratio from the balanced chemical reaction is,

Different colors of sedimentary rock are determined by the environment where they are located. For example, red rocks form where oxygen is present. Darker sediments form when the environment is oxygen poor.
So, basically, the weather and surroundings of the rock, so B.
Answer:
There are many reagents.
1. <u>Use</u><u> </u><u>acidified</u><u> </u><u>potassium</u><u> </u><u>permanganate</u><u> </u><u>solution</u>
2. <u>Use</u><u> </u><u>acidified</u><u> </u><u>potassium</u><u> </u><u>dichromate</u><u> </u><u>solution</u>
3. <u>Fehling</u><u> </u><u>solution</u><u>.</u>
4. <u>Silver</u><u>/</u><u> </u><u>oxygen</u><u> </u><u>at</u><u> </u><u>5</u><u>0</u><u>0</u><u>°</u><u>C</u>
5. <u>Copper</u><u>/</u><u> </u><u>oxygen</u><u> </u><u>at</u><u> </u><u>3</u><u>0</u><u>0</u><u>°</u><u>C</u>
6. <u>Lucas</u><u> </u><u>reagent</u><u> </u><u>(</u><u> </u><u>anhydrous</u><u> </u><u>zinc</u><u> </u><u>and</u><u> </u><u>conc</u><u>.</u><u> </u><u>hydrochloric</u><u> </u><u>acid</u><u>)</u>
Explanation:
Observations:
[with acidified potassium permanganate solution]
» Ethanol : The purple solution turns colourless.
» 2-methyl-2-propanol : no observable change.
[with acidified potassium dichromate solution]
» Ethanol : orange solution turns green
» 2-methyl-2-propanol : no observable change.
[Fehling solution]
» Ethanol : a white precipitate is formed
» 2-methyl-2-propanol : no observable change