Tag: hydrogen

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Questions Related to hydrogen

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

Hydrogen is:

  1. electropositive

  2. electronegative

  3. both electropositive as well as electronegative

  4. neither electropositive nor electronegative
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Hydrogen is both electropositive as well as electronegative, as it forms hydrogen ion $H^+$ as well as hydride ion $H^-$.
Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

Hydrogen readily combines with these elements?

  1. Na

  2. K

  3. Ca

  4. Zn
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

${ H } _{ 2 }$ easily reacts with $Na, Ca, K$ as they are highly reactive metals and are placed at the top of the reactivity series.

${ 2Na }+{ H } _{ 2 }\rightarrow 2NaH$
$2K+{ H } _{ 2 }\rightarrow 2KH$
$Ca+{ H } _{ 2 }\rightarrow CaH _2$.