Tag: hydrides

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Questions Related to hydrides

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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

  1. Ionic hydride

  2. Covelent hydride

  3. Metallic hydride

  4. Polymeric hydride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calcium hydride (CaH2) is formed by an alkaline earth metal and hydrogen, resulting in an ionic bond between the metal cation and the hydride anion.

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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. $BiH _3, AsH _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the group 15 hydrides, basicity decreases down the group as the lone pair becomes more diffuse and less available for donation. Thus, NH3 is the strongest base and BiH3 is the weakest.

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

Ionic hydrides are usually:

  1. good electrical conductors when solid

  2. easily reduced

  3. good reducing agents

  4. liquid at room temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ionic hydrides are usually good reducing agents. 

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

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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. $HCl>HBr>HI>HF$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Europium and Ytterbium are lanthanoids that form non-stoichiometric or interstitial hydrides, not ionic hydrides. The other statements are generally accepted chemical facts regarding hydrides.

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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. $None\ of\ the\ above$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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. $H _{3}O^+$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

Multiple choice hydrides hydrogen and its compounds hydrogen chemistry

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

  1. Au

  2. Ni

  3. Ca

  4. Cu
Reveal answer Fill a bubble to check yourself
C Correct answer
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:-
$Ca+H _2\longrightarrow CaH _2$