Which of the following is an unusual characteristic of interstitial hydrides? Se

Question

Which of the following is an unusual characteristic of interstitial hydrides? Select one a Interstitial hydrides contain hydrogen b. The addition of hydrogen changes the physical properties of interstitial hydrides. O c. Interstitial hydrides form in a non-stoichiometric relationship. O d. Interstitial hydrides form by hydrogen gas collecting in the flaws of the metal. How does treatment with carbn make metals (such as tungsten and iron) change their composition? Select one O a. The carbon is able to collect in the interstices of the metal lattice and provide a much more stable structure. O b. The carbon reacts with these metals to form covalent complexes that are extremely rigid O c. The metal atoms are able to intercalate into the covalent network solid of the carbon lattice and thus able to take on the stren h o he covalent network solid O d. There is an interlocking of the metallic solid and the covalent network solid to form a new substance that is stronger than either individually. Coke, which is used in the purification of metal from metal oxides, is pure carbon. How does it differ from graphite, which is also pure carbon? Select one O a. Coke is an amorphous solid, graphite is a crystalline solid. O b. Coke is an allotrope of graphite. o c. Coke and graphite are actually identical to each other. They have different names for historical reasons. O d. Coke is actually a thick, sweet liquid sold commercially in a carbonated form, while graphite is a solid used in pencils.

Explanation / Answer

1.)Interstitial hydride contain hydrogen .crystal lattice has expended through the inclusion of hydrogen and make metal hydride brittle. In many hydride Hydrogen atom occupy the tetrahedral holes in a cubic closed packed array of metal atoms but all the tetrahedral holes are not available so the interstitial hydride are nonstoichiometric in form.

In above discussion is clearly shown that all the option are correct.

2.) The above given carbide are interstitial carbide. In these carbides carbon atom present in octahedral holes in the closed packed metal lattice because iron and toungustan metal has enough large size to provide enough large octahedral holes for carbon accommodation.

So the option first is correct.

3.)coke is different from graphite . It is amorphous solid residue While Graphite is crystalline solid allotrope of carbon.

So the option first is correct.

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