Tag: hydrogen and its compounds

Questions Related to hydrogen and its compounds

The products formed when heavy water is reacted with magnesium nitride, is/are _______.

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. $NH _{3}Mg\left ( OH \right ) _{2}$

  2. $NH _{3}Mg\left ( OD \right ) _{2}$

  3. $ND _{3}Mg\left ( OH \right ) _{2}$

  4. $ND _{3}Mg\left ( OD \right ) _{2}$

Show answer
Correct Option: D
Explanation:

$Mg _{ 3 }{ N } _{ 2 }+6{ D } _{ 2 }O \rightarrow 2{ ND } _{ 3 }+ 3Mg(OD) _{ 2 }$

$NaOH + D _{2}O \rightarrow NaOD + HDO$, is a:

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. exchange reaction.

  2. deuterolysis reaction.

  3. hydrolysis reaction.

  4. softening reaction.

Show answer
Correct Option: A
Explanation:
$NaOH + D _2O \rightarrow NaOD + HDO$, is exchange reaction where hydrogen in $NaOH$ is replaced by $D$ in $D _2O$ became $NaOD$.

Heavy water is used as a:

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. fuel in engines

  2. semiconductor

  3. moderator in nuclear reactors

  4. insulator in steam engines

Show answer
Correct Option: C
Explanation:

Answer:-

Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238, which captures neutrons without fissioning.

Heavy water is used as _______ in nuclear reactor.

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. controller

  2. moderator

  3. promoter

  4. none of these

Show answer
Correct Option: B
Explanation:

Heavy water acts as a neutron moderator in nuclear reactors to slow down neutrons so that they are more likely to react with the fissile $U _{235}$ than with $U _{238}$, which captures neutrons without fission process.

Heavy hydrogen has __  neutron and  _ proton in the nucleus.

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. 2 and 1

  2. 1 and 2

  3. 1 and 1

  4. 2 and 2

Show answer
Correct Option: C
Explanation:
Deuterium is called as a heavy hydrogen.
Heavy hydrogen $\left( _{ 1 }^{ 2 }{ D } \right) $ $=$ $1$ neutron
                                            $1$ proton
                                            ${ 1e }^{ - }$

The reactions of heavy water are slow. The reason is :

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. heavy water is associated.

  2. heavy water is dissociated.

  3. heavy water is of higher mass.

  4. heavy water is of lower mass.

Show answer
Correct Option: C
Explanation:

As Deuterium contains one extra neutron, so heavy water has higher molecular mass than water and because of that it is less reactive.

A molecule of heavy water has two deuterium atoms in place of the two protium atoms of ordinary "light" water. The weight of a heavy water molecule, however, is not substantially different from that of a normal water molecule,

Deuteromethane can be prepared if $D _{2}O$ reacts with:

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. $Al _{4}C _{3}$

  2. $CaC _{2}$

  3. both A and B

  4. none of the above

Show answer
Correct Option: A
Explanation:
On hydrolysis of $Al _{4}C _{3}$ methane forms, similarly $D _2O$ reacts with $Al _{4}C _{3}$ and deuteromethane forms as the product.

The weight of one mole of heavy water is:

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. $18$ gm

  2. $20$ gm

  3. $19$ gm

  4. $21$ gm

Show answer
Correct Option: B
Explanation:
 Deuterium is called as heavy water,

As atomic mass of Deuterium is 2 and atomic mass of oxygen is 16

So Molar mass of $D _2O$ is = $2\times2 +1\times 16= 20$

Weight of $1$ mole of ${ D } _{ 2 }O =$ Molecular mass of ${ D } _{ 2 }O = 20$ gm

Option B is correct.

$D _2O$ ( heavy water) and $H _2O$ differ in following except :

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. Freezing point

  2. Density

  3. Ionic product of water

  4. None of these

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Correct Option: D

Deuterio hydrate of magnesium sulphate contains how many molecules of heavy water?

chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

  1. $2\ D _{2}O$

  2. $3\ D _{2}O$

  3. $10\ D _{2}O$

  4. $7\ D _{2}O$

Show answer
Correct Option: D
Explanation:

Deuterio hydrate of magnesium sulphate is $MgSO _4.7D _2O$. So, 7 molecules of heavy water molecules is present.