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Comprehension:

What is the compound A from the following observations?

Some observations related to an unknown inorganic substance A are presented below.

1.  A has a molecular weight of 267, and it is a yellowish-white deliquescent solid, and it sublimes on heating.

2. A reacts violently with water, forming solution B.

3. When a solution of NH4Cl and NH4OH is added to solution B, a white gelatinous precipitate is obtained.

4. A sample of B also gives a curdy white precipitate C on addition of dilute nitric acid and silver nitrate solution. This white precipitate C readily dissolves when dilute NH4OH is added, though a gelatinous white precipitate D is formed in its place with excess NH4OH.

5. Precipitate D is filtered off and is dissolved in excess NaOH to give a clear solution E.

6. When CO2 is passed through solution E, compound D is re-precipitated.

7. Substance A unchanged in dry ether, when this solution is reacted with excess LiH, it transforms to G.

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