Tag: study of heavy water

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

Heavy water is not used for drinking because:

  1. it is poisonous

  2. it is costly

  3. its physiological action is different from ordinary water

  4. its chemical properties different from ordinary water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As molecular mass of heavy water is higher than water so its physiological action is different from ordinary water and because of that reason it can not be used as drinking water.

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

Which of the following are correctly matched?


$(a):D _{2}O-$ Hard water

$(b):H _{2}O-$ Heavy water

$(c):D-$ Heavy hydrogen

$(d):BaO _{2}.8H _{2}O-$ True peroxide

  1. $a, b, c, d$ are correct
  2. $c, d$ are correct
  3. $a, b, c$ are correct
  4. $a, c, d$ are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$D _{2}O-$ Heavy water


$H _{2}O-$ Ordinary water

$D-$ Heavy hydrogen (As atomic mass of $D$ is higher than $H$)

$BaO _{2}.8H _{2}O-$ True peroxide.

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

Heavy water $(D _{2}O)$ freezes at:

  1. $0^\circ C$
  2. $-3.8^\circ C$
  3. $0.8^\circ C$
  4. $3.82^\circ C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Freezing point of heavy water is $3.82^oC$. Heavy water is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, rather than the common hydrogen-$1$ isotope that makes up most of the hydrogen in regular water.

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

Which of the following is not true?

  1. Ordinary water is electrolysed more rapidly than $D _{2}O$
  2. $D _{2}O$ freezes at lower temperature than $H _{2}O$
  3. Reaction between $H _{2}$ and $Cl _{2}$ is much faster than $D _{2}$ and $Cl _{2}$
  4. Bond dissociation energy for $D _{2}$ is greater than $H _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As D contains one extra neutron so heavy water has higher molecular mass than water and its electrolysis takes more time.
Also because of that it is less reactive and bond dissociation energy for $D _{2}$ is greater than $H _{2}$.
And $D _{2}O$ freezes (3.8C) at higher temperature than $H _{2}O$