Question

Name the colourless toxic gas that is produced when BF, is heated with Sodium hydride (NaH) at 450K.​

Answer 1

Answer:

Diborane

Explanation:

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Answer 2

Answer:

When BF, is heated with Sodium hydride (NaH) at 450K it produces Diborane gas under the catalyst Diethyl ether and as a result produces Lithium boron hydride.

Explanation:

2BF3+6NaH⟶450K⟶6NaF+B2H6(X)

B2H6+2LiH⟶ Diethyl ether⟶  2LiBH4(Y)

(Diborane)                              (Lithium boron hydride)

Diborane characteristics

1. Diborane is a highly toxic gas
2. Diborane is colourless
3. Diborane is stable only in low temperatures.
4. Diborane reacts with strong alkalis to form metaborates and dihydrogen gas.
5. Each boron atom in diborane has three Valence electrons to share. If each boron forms three covalent bonds with three hydrogen atoms, there are no electrons left on the boron atom to share with other boron atoms. As a result, the two boron atoms cannot be joined.

                   

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