Tag: hydrogen and its compounds

Quizzes (8) Questions (82)

Questions Related to hydrogen and its compounds

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

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

  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. $ND _{3}Mg\left ( OD \right ) _{2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Heavy water is used as a:

  1. fuel in engines

  2. semiconductor

  3. moderator in nuclear reactors

  4. insulator in steam engines
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Heavy water is used as _______ in nuclear reactor.

  1. controller

  2. moderator

  3. promoter

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. 2 and 1

  2. 1 and 2

  3. 1 and 1

  4. 2 and 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Deuterium is called as a heavy hydrogen.
Heavy hydrogen $\left( _{ 1 }^{ 2 }{ D } \right) $ $=$ $1$ neutron
                                            $1$ proton
                                            ${ 1e }^{ - }$
Multiple choice chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

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

  1. heavy water is associated.

  2. heavy water is dissociated.

  3. heavy water is of higher mass.

  4. heavy water is of lower mass.
Reveal answer Fill a bubble to check yourself
C Correct answer
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,

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

The weight of one mole of heavy water is:

  1. $18$ gm
  2. $20$ gm
  3. $19$ gm
  4. $21$ gm
Reveal answer Fill a bubble to check yourself
B Correct answer
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.