Advertisements
Advertisements
Question
Which of the following statements about hydrogen are correct?
(i) Hydrogen has three isotopes of which protium is the most common.
(ii) Hydrogen never acts as cation in ionic salts.
(iii) Hydrogen ion, \[\ce{H+}\], exists freely in solution.
(iv) Dihydrogen does not act as a reducing agent.
Solution
(i) Hydrogen has three isotopes of which protium is the most common.
(ii) Hydrogen never acts as cation in ionic salts.
Explanation:
When an electron is removed from a hydrogen atom, the nucleus decreases to 1.5 × 10–3 pm in size. When compared to usual atomic and ionic sizes of 50 to 200 pm, this is exceedingly small. As a result, \[\ce{H+}\] does not exist independently and is always bound to other atoms or molecules.
APPEARS IN
RELATED QUESTIONS
Saline hydrides are known to react with water violently producing fire. Can CO2, a well-known fire extinguisher, be used in this case? Explain.
Arrange the following:
NaH, MgH2 and H2O in order of increasing reducing property.
How can saline hydrides remove traces of water from organic compounds?
What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards the water.
Which of the following hydrides is electron-precise hydride?
Which of the following statements is correct?
(i) Elements of group 15 form electron deficient hydrides.
(ii) All elements of group 14 form electron precise hydrides.
(iii) Electron precise hydrides have tetrahedral geometries.
(iv) Electron rich hydrides can act as Lewis acids.
NaH is an example of ______.
