Consider the following statements about the hydrides
I) Sodium hydride with water liberates oxygen gas
II) Methane, silane are examples of electron precise hydrides
III) Ammonia and water molecules are examples of electron deficient hydrides
IV) Hydrides of beryllium and magnesium are polymeric in structure
The correct statements are

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II & IV only

I & II only

I & IV only

III & IV only

answer is C.

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Detailed Solution

Electron precise hydrides are those that have the exact number of electrons to form normal covalent bonds. Group 14 elements forms such types of hydrides. For example are methane hydride, silane and many more.

Aluminum and beryllium hydrides have a chain-like structure. They are usually found in polymeric form where each unit is bonded with another through hydrogen bridges.

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