1. Tardigrade
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  3. Chemistry
  4. Assertion: Oxidation state of hydrogen is +1 in H2O while -1 in CaH2. Reason: CaH2 is a metal hydride and for hydrides, hydrogen is assigned the oxidation number of -1.

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Q. Assertion : Oxidation state of hydrogen is +1 in $H_2O$ while -1 in $CaH_2$.
Reason : $CaH_2$ is a metal hydride and for hydrides, hydrogen is assigned the oxidation number of -1.

AIIMSAIIMS 2018Redox Reactions

Solution:

Oxidation number of elements in their compounds or ions is obtained using some rules e.g., hydrogen is assigned oxidation number of +1 in general and -1 for metal hydrides.