Tag: hydrogen and its compounds

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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

$D _2O$ can be obtained by:

  1. repeated distillation

  2. exchange process

  3. neutron emitting radioactive decay in presence of water

  4. exhaustive electrolysis of alkaline water
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

Heavy water is deuterium oxide $(D _2O)$. Ordinary water contains a fraction (1 in 6000 parts) of heavy water. On large scale, it is produced by repeated electrolysis of ordinary water containing alkali. It is also produced by repeated distillation and condensation. It is also obtained by exchange process.

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

Heavy metals is used as a moderator in nuclear reactors to bring the fission reaction by slowing down the neutrons and capturing them. The main reason is that the heavy water captures less neutrons than the normal water. Later it can be used as a fuel which has not undergone enrichment to increase the percentage of Uranium-235

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

$D _{2}O$ is used more in:

  1. chemical industry

  2. nuclear moderator

  3. pharmaceutical preparation

  4. insecticide preparations
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heavy water is used in 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 hydrogen and its compounds heavy water study of heavy water hard water and soft water

Organic ion exchange resins purify hard water to yield :

  1. Distilled water

  2. Only decalcified water

  3. Deionised water
  4. Water having relatively high concentration of $OH^{-}$ion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Organic ion exchange resins are used for water softening. In this process, the $Ca^{+2}$ and $Mg^{+2}$ ions which cause hardness are exchanged for $Na^{+}$ or $K^{+}$ ions due to which the water becomes decalcified or hardness free. Therefore, organic ion exchange resins purify hard water to yield only decalcified water

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

Hardness of water can be detected with:

  1. $Na _{2}CO _{3}$ solution

  2. soap water
  3. dil. $HCl$
  4. acidified $KMnO _{4}$ solution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hardness of water can be detected with soap water. Water is described as being 'hard' if it does not lather readily with soap. 

'Soft water', on the other hand, is described as the one, which lathers readily with soap. Chemically, natural water is never pure and contains varying amounts of the dissolved impurities absorbed from the natural or man made environment. 
When appreciable concentrations of calcium ions $(Ca^{2+})$ or the magnesium ions $(Mg^{2+})$ in the form of their dissolved salts are contained in water, it becomes hard.

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

Heavy water $\displaystyle \left( { D } _{ 2 }O \right) $ is used in Atomic Reactors as -

  1. Coolant

  2. Controller

  3. Shield

  4. Moderator
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Moderator. e.g. , Heavy water, is a substance used in nuclear reactors of reduce the speed of fast Neutrons produced by nuclear fission.Moderator. e.g. , Heavy water, is a substance used in nuclear reactors of reduce the speed of fast Neutrons produced by nuclear fission.Moderator. e.g. , Heavy water, is a substance used in nuclear reactors of reduce the speed of fast Neutrons produced by nuclear fission.'

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

Heavy water is used in nuclear reactors as:

  1. source of $\alpha-$ particles

  2. slowing down the speed of high energy neutrons

  3. transporting heat of the reactor

  4. heating purpose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heavy water is used in nuclear reactors, where it acts as a neutron moderator 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 fissioning.