Long Answer TypeWhat do you understand by:
(i) electron deficient
(ii) electron-precise and
(iii) electron rich compounds of hydrogen?
Provide justification with suitable examples.
Short Answer TypeWhat characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactivity ?
Long Answer TypeWhat do you understand by the term ‘non-stoichiometic hydrides’? Do you expect this type of hydrides to be formed by alkali metals?
Short Answer TypeSaline hydrides are known to react with water violently producing fire. Can CO2, a well-known fire extinguisher, be used in this case? Explain.
What do you expect the nature of hydrides if formed by elements of atomic numbers 15, 19, 23, 44 with dry dihydrogen? Compare their behaviour towards water.
(i) The element having Z = 15 is a non-metal (i.e. P), therefore it forms covalent hydride (i.e. PH3).
(ii) The element having Z = 19 is an alkali metal (i.e. K), therefore it forms ionic or saline hydride (i.e. K+ H-).
(iii) The element having Z = 23 is a transition metal (i.e. V) of group 5, therefore it forms an interstitial or metallic hydride (i.e. V H1.6).
(iv) The element having Z =44 is a transition metal (i.e. Ru) of group 8, therefore it does not form any hydride.
Behaviour towards the water. Only ionic hydrides react with water evolving H2 gas.
Can Phosphorus with outer electronic configuration 3s23p3 form PH5?
Or
P forms PH3 but not PH5. Comment.
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