Question

why ionic hydrides are called true hydrides?

why water gas is more energetic than coal?

why nascent hydrogen is more reactive than molecular hydrogen?

why metallic hydrides are called interstitial hydrides?

why complex hydrides are used as reducing agent?



GIVE SUITABLE REASONS FOR ABOVE QUESTIONS ☺

Answer 1

1. Why ionic hydrides are called true hydrides?

Ans : Alkali and Alkaline earth metal hydrides are called true hydrides ble they are non-volatile & they have high m.p and B.P. They are stable and hence called true hydrides.

2. Why water gas is more energetic than coal?

Ans: Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas.Synthesis gas is a useful product. Burning natural gas, for instance, produces nearly half as much carbon dioxide per unit ofenergy compared with coal.The gas is about 30 times better at holding in the atmosphere's heat compared with carbon dioxide.

3. Why nascent hydrogen is more reactive than molecular hydrogen?

Ans : The nascent hydrogen evolves from the reaction ( like reaction of alkali metal with water ,acid) that just occurred a moment ago.
In case of molecular hydrogen, it does not evolves from any chemical, nuclear fission or physical reaction.it would not have any external energy.And,suppose due to external gravitational influence,it gains acceleration then according,to Maxwell’s postulate it would eventually lose all of its energy till it ceases to exist.
Therefore, nascent hydrogen is more reactive than molecular hydrogen.

4. Why metallic hydrides are called interstitial hydrides?

Ans : metallic hydrides are also called interstitial hydrides because these compounds are thought to consist of a crystal lattice of metal atoms with the smaller hydrogen atoms occupying holes b/w the large atoms.

5.  Why complex hydrides are used as reducing agent?

Ans :  Hydrides (of any metals, not necessarily alkaline) contain hydride ion H−HX−, which is basically a hydrogen having one extra electron (or, in other words, a hydrogen in oxidation state -1). Now, hydrogen's electronegativity is relatively low for a non-metal, and so is its electron affinity. It can be said that hydrogen takes that extra electron almost reluctantly, and is ready to give it away to any oxidizer, even a weak one. This makes the hydride ion (and any compound which it is a part of) a powerful reducing agent.
Some complex reducing agents are  LiAlH4, Mg(AlH4)2

I hope it helps you ^_^

Answer 2

Answer:

Ionic hydrides are sometimes known as salt-like hydrides. Saline hydrides are formed when an electron is transferred from a metal atom to a hydrogen atom. These are stoichiometric and binary hydrogen compounds having a higher proportion of electropositive elements than hydrogen, such as alkali metals and alkaline earth metals (except Be).

Explanation:

1. True hydrides, which include alkali and alkaline earth metal hydrides, are non-volatile and have high m.p. and B.P. They are known as genuine hydrides because they are stable.

2. Carbon monoxide and hydrogen are combined to create water gas, which is created from synthesis gas. A valuable product is a synthetic gas. For instance, using natural gas results in about half as much carbon dioxide per unit of energy as burning coal. Compared to carbon dioxide, the gas is around 30 times more effective in retaining the heat of the atmosphere.

3. The reaction that just took place (similar to the interaction of an alkali metal with water or acid) gives rise to the developing hydrogen.

• In the case of molecular hydrogen, no chemical, nuclear, or physical reaction gives rise to it.
• It wouldn't require any outside energy.
• And if it were to accelerate as a result of external gravitational attraction, Maxwell's postulate states that it would finally exhaust all of its energy and cease to exist.
• Since molecular hydrogen is less reactive than nascent hydrogen.

4. Because these compounds are believed to be made of a crystal lattice of metal atoms with the smaller hydrogen atoms occupying gaps between the big atoms, metallic hydrides are also known as interstitial hydrides.

5. Any metal hydride, not just those that are alkaline, contains the hydride ion HX, which is essentially hydrogen with an additional electron (or, in other words, hydrogen in oxidation state -1). Now, both the electronegativity and the electron affinity of hydrogen are relatively low for a non-metal. It may be claimed that hydrogen almost unwillingly accepts the additional electron and is willing to offer it to any oxidizer, no matter how weak. As a result, the hydride ion (and any compound of which it is a component) acts as a potent reducer.

Hence, each answer is explained above.

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