Hydrogen And Its Compound Test

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Hydrogen And Its Compound Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Heavy water is used in atomic reactor as

A
Coolant

B
Moderator

C
Both moderator and coolant

D
Neither coolant nor moderator

Solution

Heavy water is used as a moderator to slow down the speed of fast moving neutrons and as well as a coolant.
Question 2
1 / -0

Heavy water freezes at

A
0°C

B
3.8°C

C
38°C

D
– 0.38°C

Solution

Heavy water freezes at a slightly higher temperature than water.
Question 3
1 / -0

The pH of D₂O and H₂O at 298 K is

A
7.0, 7.0

B
7.35, 7.0

C
7.0, 6.85

D
6.85, 7.35

Solution

pH of heavy water is slightly more than seven.
Question 4
1 / -0

Which of the following is not true

A
Ordinary water is electrolysed more rapidly than D₂O

B
Reaction between H₂ and Cl₂ is much faster than D₂ and Cl₂

C
D₂O freezes at lower temperature than H₂O

D
Bond dissociation energy for D₂ is greater than H₂

Solution

D₂O actually has higher freezing point (3.8°C) than water H₂O (0°C).
Question 5
1 / -0

Which of the following will determine whether the given colourless liquid is water or not

A
Melting

B
Tasting

C
Phosphthalein

D
Adding a pinch of anhydrous CuSO₄

Solution

Colourless anhydrous CuSo₄ becomes blue on reaction with water.
Question 6
1 / -0

Lead pipes are not used for carrying drinking water because

A
They are covered with a coating of lead carbonate

B
They are corroded by air and moisture

C
Water containing dissolved air attacks lead forming soluble hydroxide

D
None of these

Solution

Due to plumbosolvancy, lead dissolves in water to a small extent to form soluble hydroxide which is poisonous so lead pipe is not used for carrying drinking water.
Question 7
1 / -0

Which of the following will cause softening of hard water

A
Passing it through cation exchange resin

B
Passing it through anion exchange resin

C
Passing it through sand

D
Passing it through alumina

Solution

In cation exchange resin Mg⁺² and Ca⁺² (cations) are replaced by Na⁺ ions.

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Re-Attempt Weekly Quiz Competition

Hydrogen And Its Compound Test - 2

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Hydrogen And Its Compound Test - 2

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SHARING IS CARING

Question 1

Coolant

Moderator

Both moderator and coolant

Neither coolant nor moderator

Solution

Question 2

0°C

3.8°C

38°C

– 0.38°C

Solution

Question 3

7.0, 7.0

7.35, 7.0

7.0, 6.85

6.85, 7.35

Solution

Question 4

Ordinary water is electrolysed more rapidly than D2O

Reaction between H2 and Cl2 is much faster than D2 and Cl2

D2O freezes at lower temperature than H2O

Bond dissociation energy for D2 is greater than H2

Solution

Question 5

Melting

Tasting

Phosphthalein

Adding a pinch of anhydrous CuSO4

Solution

Question 6

They are covered with a coating of lead carbonate

They are corroded by air and moisture

Water containing dissolved air attacks lead forming soluble hydroxide

None of these

Solution

Question 7

Passing it through cation exchange resin

Passing it through anion exchange resin

Passing it through sand

Passing it through alumina

Solution

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Ordinary water is electrolysed more rapidly than D₂O

Reaction between H₂ and Cl₂ is much faster than D₂ and Cl₂

D₂O freezes at lower temperature than H₂O

Bond dissociation energy for D₂ is greater than H₂

Adding a pinch of anhydrous CuSO₄