Tag: hydrides

Questions Related to hydrides

Ionic hydride among following is 

hydrides hydrogen and its compounds hydrogen chemistry

  1. $BeH _2$

  2. $NH _2$

  3. $CaH _2$

  4. $CuH _2$

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Correct Option: C

Hydrogen differ with alkali metals in the following aspect ?

hydrides hydrogen and its compounds hydrogen chemistry

  1. Formation of halides

  2. Formation of oxides

  3. Electronic configuration

  4. Atomicity

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Correct Option: A

Among $CaH _2, NH _3, NaH$ and $B _2H _6$, which are covalent hydrides?

hydrides hydrogen and its compounds hydrogen chemistry

  1. $NH _3$ and $B _2H _6$

  2. $NaH$ and $CaH _2$

  3. $NaH$ and $ NH _3$

  4. $CaH _2$ and $B _2H _6$

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Correct Option: A
Explanation:

$NH _3$ and $B _2H _6$ are the covalent hydrides and $CaH _2$ and $NaH$ are the ionic hydride.

$N$ and $B$ form covalent hydride as they have high electronegativity and small size.

Hydrogen is:

hydrides hydrogen and its compounds hydrogen chemistry

  1. electropositive

  2. electronegative

  3. both electropositive as well as electronegative

  4. neither electropositive nor electronegative

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Correct Option: C
Explanation:
Hydrogen is both electropositive as well as electronegative, as it forms hydrogen ion $H^+$ as well as hydride ion $H^-$.

Hydrogen readily combines with these elements?

hydrides hydrogen and its compounds hydrogen chemistry

  1. Na

  2. K

  3. Ca

  4. Zn

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Correct Option: A,B,C
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.

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