1.give chemical reactions to show hydrogen are good reducing agents.
2.What happens when zinc reacts with caustic soda and caustic potash.
3.Give the chemical equation to show sodium aluminate is formed from aluminum.
4. Why nitric acid is not used in the preparation of hydrogen gas?
5. What happens when calcium reacts with cold water
Answers
Answer:
1)Reducing agents can be ranked by increasing strength by ranking their reduction potentials. The reducing agent is stronger when it has a more negative reduction potential and weaker when it has a more positive reduction potential.
2) Zn + 2NaOH Na2ZnO2 + H. Zinc react with sodium hydroxide to produce zincate sodium and hydrogen. ... Zinc reacts with NaOH solution to give Sodium Zincate.
3) I don't know.
4)This is because nitric acid is a strong oxidising agent, and oxidises hydrogen gas to convert it into the water.
5) Calcium, for example, reacts fairly vigorously with cold water in an exothermic reaction. Bubbles of hydrogen gas are given off, and a white precipitate (of calcium hydroxide) is formed, together with an alkaline solution (also of calcium hydroxide - calcium hydroxide is slightly soluble).
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