Tag: hydrogen and its compounds

Questions Related to hydrogen and its compounds

Which of the following represents saline Hydrydes?

  1. $KH,\,Ca{H _2},\,Ba{H _2}$

  2. $NaH,Si{H _4},KH$

  3. $N{H _3},{B _2}{H _6}\,Al{H _3}$

  4. $N{H _3},{H _2}O,HF$


Correct Option: B

$Ca{H _2}$ is an example of :

  1. Ionic hydride

  2. Covelent hydride

  3. Metallic hydride

  4. Polymeric hydride


Correct Option: A

Which of the following pair behaves strong and weak base hydride :


$NH _3, PH _3, AsH _3, SbH _3, BiH _3$

  1. $NH _3, PH _3$

  2. $NH _3, BiH _3$

  3. $PH _3, BiH _3$

  4. $BiH _3, AsH _3$


Correct Option: A

Ionic hydrides are usually:

  1. good electrical conductors when solid

  2. easily reduced

  3. good reducing agents

  4. liquid at room temperature


Correct Option: C
Explanation:

Ionic hydrides are usually good reducing agents. 

$2CO+NaH \rightarrow HCOONa+C$ 
$PbSO _4+2CaH _2 \rightarrow PbS + 2Ca(OH) _2$ 
$Fe _3O _4 + NaH \rightarrow 3Fe +4 NaOH$

The stability of hydrogen halides is in the order of:

  1. $HF>HI>HBr>HCl$

  2. $HI>HBr>HCl>HF$

  3. $HF>HCl>HBr>HI$

  4. $HCl>HBr>HI>HF$


Correct Option: C
Explanation:

Due to large difference in electronegativity of upper halogens and hydrogen, they are more stable than lower hydrogen halide.
$\therefore $ Stability order: $HF>HCl>HBr>HI$.

Which of the following hydride is 'electron-precise' type?

  1. $HF$

  2. $H _2O$

  3. $SiH _4$

  4. $PH _3$


Correct Option: C
Explanation:

Hydrides of carbon family known as electron Precise.

Hydorgen forms binary compounds called hybrides with several elements in the periodic table.Regarding these hydrides the wrong statement 

  1. Among lanthanoids europioum and ytterbium form ionic hydrides

  2. Density of ionic hydrides is less while the density of interstitial hydrides is more than the metals from which they are formed

  3. The rate of reaction of alkali metals towards hydrogen decreases from lithium to ceasium

  4. Hydrogen gas can be purified by the phenomenon of Occlusion of hydrogen by palladium


Correct Option: A

The hydride ion, $H^{-}$ is a stronger base than its hydroxide ion $OH^{-}$. Which of the following reactions will occur, if sodium hydride $(NaH)$ is dissolved in water?

  1. $H^{-} _{\left ( aq \right )}+H _{2}O\rightarrow H _{3}O^{-}$

  2. $H^{-} _{\left ( aq \right )}+H _{2}O _{\left ( l \right )}\rightarrow OH^{-}+H _{2}$

  3. $H^{-}+H _{2}O _{(l)}\rightarrow\ no\ reaction$

  4. $None\ of\ the\ above$


Correct Option: B
Explanation:

Sodium hydride $(NaH)$ react with water to form hydrogen gas and the sodium hydroxide $(NaOH)$.
$NaH+H _2O\rightarrow H _2+NaOH$
i.e., $Na^+, H^-$ and $H^+, OH^- $ give rise to $H _2$ and $NaOH$. So, it is similar to option B.

According to recent views, which is the current representation of hydrated proton in aqueous solution?

  1. $H^{+}$

  2. $H _{9}O _{5}^{+}$

  3. $H _{9}O _{4}^{+}$

  4. $H _{3}O^+$


Correct Option: D
Explanation:

The hydrated proton is represented as $H _3O^+$. Hence, the correct option is $D$.

Which of the following metals directly combine with hydrogen gas to give a hydride? 

  1. Au

  2. Ni

  3. Ca

  4. Cu


Correct Option: C
Explanation:

Amongst, $Au$, $Ni$, $Ca$ and $Cu$, $Ca$ is the most reactive metal. So it easily combines with $H _2$ to form hydride while the other metals do not combine directly.


The reaction can be given as:-
$Ca+H _2\longrightarrow CaH _2$