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CHXI09:HYDROGEN

315697 The number of protons, electrons and neutrons in a molecule of heavy water are respectively:

1

8, 10, 11

2

10, 10, 10

3

10, 11, 10

4

11, 10, 10

Explanation:

Heavy water is $D_{2} O$
hence number of electrons $= 2 + 8 = 10$
number of protons $= 10$
Atomic mass of $D_{2} O = 4 + 16 = 20$
hence number of neutron
$=$ Atomic mass number of protons $= 20 - 10 = 10$

JEE - 2013

CHXI09:HYDROGEN

315698 Which of the following statements are correct regarding $D_{2} O$ and $H_{2} O$ ?
I. $D_{2} O$ reacts with ${Al}_{4} C_{3}$ at a faster rate than does with $H_{2} O$ .
II. The freezing point of $D_{2} O$ is higher than that of $H_{2} O$
III. $NaCl$ is more soluble in $D_{2} O$ than in $H_{2} O$ .
IV. Ionic product of $D_{2} O$ is smaller than that of $H_{2} O$ .
Select the correct answer using the codes given below.

1 Both I and II

2 Both I and III

3 Both II and III

4 Both II and IV

Explanation:

Statements II and IV are correct,
while I and III are incorrect.
Corrected form are as follows:
I. Being heavier in mass $D_{2} O$ reacts with ${Al}_{4} C_{3}$ slower than $H_{2} O$ .
III. $NaCl$ is less soluble in $D_{2} O$ as compared to $H_{2} O$ .

CHXI09:HYDROGEN

315699 Some statements about heavy water are given below:
(i) Heavy water is used as a moderator in nuclear reactors
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water
Which of the above statements are correct?

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (ii) and (iii)

4 (i) and (iii)

CHXI09:HYDROGEN

315697 The number of protons, electrons and neutrons in a molecule of heavy water are respectively:

1

8, 10, 11

2

10, 10, 10

3

10, 11, 10

4

11, 10, 10

Explanation:

Heavy water is $D_{2} O$
hence number of electrons $= 2 + 8 = 10$
number of protons $= 10$
Atomic mass of $D_{2} O = 4 + 16 = 20$
hence number of neutron
$=$ Atomic mass number of protons $= 20 - 10 = 10$

JEE - 2013

CHXI09:HYDROGEN

315698 Which of the following statements are correct regarding $D_{2} O$ and $H_{2} O$ ?
I. $D_{2} O$ reacts with ${Al}_{4} C_{3}$ at a faster rate than does with $H_{2} O$ .
II. The freezing point of $D_{2} O$ is higher than that of $H_{2} O$
III. $NaCl$ is more soluble in $D_{2} O$ than in $H_{2} O$ .
IV. Ionic product of $D_{2} O$ is smaller than that of $H_{2} O$ .
Select the correct answer using the codes given below.

1 Both I and II

2 Both I and III

3 Both II and III

4 Both II and IV

Explanation:

Statements II and IV are correct,
while I and III are incorrect.
Corrected form are as follows:
I. Being heavier in mass $D_{2} O$ reacts with ${Al}_{4} C_{3}$ slower than $H_{2} O$ .
III. $NaCl$ is less soluble in $D_{2} O$ as compared to $H_{2} O$ .

CHXI09:HYDROGEN

315699 Some statements about heavy water are given below:
(i) Heavy water is used as a moderator in nuclear reactors
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water
Which of the above statements are correct?

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (ii) and (iii)

4 (i) and (iii)

CHXI09:HYDROGEN

315697 The number of protons, electrons and neutrons in a molecule of heavy water are respectively:

1

8, 10, 11

2

10, 10, 10

3

10, 11, 10

4

11, 10, 10

Explanation:

Heavy water is $D_{2} O$
hence number of electrons $= 2 + 8 = 10$
number of protons $= 10$
Atomic mass of $D_{2} O = 4 + 16 = 20$
hence number of neutron
$=$ Atomic mass number of protons $= 20 - 10 = 10$

JEE - 2013

CHXI09:HYDROGEN

315698 Which of the following statements are correct regarding $D_{2} O$ and $H_{2} O$ ?
I. $D_{2} O$ reacts with ${Al}_{4} C_{3}$ at a faster rate than does with $H_{2} O$ .
II. The freezing point of $D_{2} O$ is higher than that of $H_{2} O$
III. $NaCl$ is more soluble in $D_{2} O$ than in $H_{2} O$ .
IV. Ionic product of $D_{2} O$ is smaller than that of $H_{2} O$ .
Select the correct answer using the codes given below.

1 Both I and II

2 Both I and III

3 Both II and III

4 Both II and IV

Explanation:

Statements II and IV are correct,
while I and III are incorrect.
Corrected form are as follows:
I. Being heavier in mass $D_{2} O$ reacts with ${Al}_{4} C_{3}$ slower than $H_{2} O$ .
III. $NaCl$ is less soluble in $D_{2} O$ as compared to $H_{2} O$ .

CHXI09:HYDROGEN

315699 Some statements about heavy water are given below:
(i) Heavy water is used as a moderator in nuclear reactors
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water
Which of the above statements are correct?

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (ii) and (iii)

4 (i) and (iii)