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Hydrogen is not obtained when zinc react...

Hydrogen is not obtained when zinc reacts with : 1)Cold water 2) Dil. H2SO4 3)Dil. HCL 4) hot 20% NaOH sol.

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To solve the question of when hydrogen is not obtained when zinc reacts with various substances, we can analyze each option step by step. ### Step-by-Step Solution: 1. **Zinc with Cold Water:** - Zinc does not react with cold water. It only reacts with steam to produce zinc oxide and hydrogen gas. Therefore, no hydrogen is produced when zinc is placed in cold water. - **Conclusion:** Hydrogen is not obtained. ...
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AAKASH INSTITUTE ENGLISH-HYDROGEN-Try Yourself
  1. The reaction between which of the following reactants produces hydroge...

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  2. High purity dihydrogen is obtained by electrolysing

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  3. Hydrogen is not obtained when zinc reacts with : 1)Cold water 2) Dil. ...

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  4. The process by which ammonia is formed from nitrogen and hydrogen is

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  5. Hydroformylation of olefins yields

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  6. Which of the following is not the use of dihydrogen?

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  7. Alkali metal hydrides react with water to give

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  8. Explain the following: lonic compounds are usually hard crystals.

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  9. Group 2 hydrides with significant covalent character is/are

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  10. In which of the compounds does hydrogen have an oxidation state of -1 ...

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  11. Then H-O-H angle in water molecule is about

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  12. The high density of water compared to ice is due to (a)hydrogen bondi...

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  13. Explain how hydrogen differs from alkali metals on the basis of ionisa...

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  14. On the basis of electronic configureation, how hydrogen resembies alka...

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  15. Which isotope of hydrogen has no neutron?

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  16. Which isotope of hydrogen is known as ordinary hydrogen?

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  17. Write the names of the three isotopes of hydrogen. What is the mass ra...

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  18. Define isotopes why do isotopes have same atomic number but differente...

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  19. Comment on the reactions of dihydrogen with (i) chlorine, (ii) sodium,...

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  20. In what ratio is nitrogen and hydrogen required to form ammonia?

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