Chemistry - Complete s-block Question with Solution | TestHub

ChemistryComplete s-blocks-block IIAMedium2 minQB

ChemistryMediumsingle choice

Passage / Comprehension

The elements Mg, Cr, Sr and Ba are react with hydrogen to form hydrides ' $MH_{2}$ '. Beryllium hydride is difficult to prepare, and less stable then the others.

Hydride, which act as a reducing agent -

Options:

Answer:

Solution:

Group 2 metals form ionic hydrides of type MH₂.

CaH₂, SrH₂, BaH₂ contain the hydride ion (H⁻), which acts as a strong reducing agent.

The hydride ion donates electrons and gets oxidized to H₂:

$2 H^{-} \to H_{2} + 2 e^{-}$

Therefore, CaH₂, SrH₂, and BaH₂ all act as reducing agents.

(D) All

Stream:JEESubject:ChemistryTopic:Complete s-blockSubtopic:s-block IIA

⏱ 2mℹ️ Source: QB

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