Hydrogen Test

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Hydrogen Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

presence of extensive hydrogen bonding between water molecules leads to

A
high heat of vaporisation and low heat of fusion

B
low freezing point, high boiling point

C
high freezing point, high boiling point

D
low heat of vaporisation and high heat of fusion

Solution

Water has high freezing point and boiling point because of strong intermolecular hydrogen bonding interactions.
Question 2
1 / -0

For moderation of the climate and body temperature of living beings, the responsible factor is:

A
high heat of vaporisation

B
high specific heat,

C
high surface tension

D
high heat of fusion

Solution

Heat of vapourisation is the responsible factor.
Question 3
1 / -0

In the gas phase water is a bent molecule with a bond angle of

A
114.5⁰

B
104.5⁰

C
124.5⁰

D
109.5⁰

Solution

Because the two non-bonding pairs remain closer to the oxygen atom, these exert a stronger repulsion against the two covalent bonding pairs, effectively pushing the two hydrogen atoms closer together. The result is a distorted tetrahedral arrangement in which the H—O—H angle is 104.5^°
Question 4
1 / -0

How many hydrogen-bonded water molecule(s) are associated in CuSO4.5H₂O?

A
2

B
5

C
1

D
none of these

Solution

In crystal structure of Copper sulphate pentahydrate there only 4 water molecule of hydration and one water molecule is associated with hydrogen bonding interaction.
Question 5
1 / -0

An ice cube floats on water because

A
Density of ice is more than that of water

B
Density of ice is zero

C
Density of ice is equal to that of water

D
Density of ice is less than that of water

Solution

Due to cage like structure of ice , for same mass of water and ice. Volume of ice is greater than that of water therefore density of ice is less than that of water.
Question 6
1 / -0

BaCl₂.2H₂O is an example of

A
hard water

B
interstitial water

C
hydrogen-bonded water

D
coordinated water

Solution

Water present in the interstitial sites in a crystal lattice is known as interstitial water. They are not held by hydrogen bonding with the other elements. If they are bonded they are called H-bonded hydrates.

Barium chloride is a white crystalline powder. It contains two molecules of water. It is one of the most important water soluble salts of Barium.
Question 7
1 / -0

Calgon is used in

A
removing permanent hardness of water

B
Causes hardness of water

C
anion exchange process

D
cation exchange process

Solution

Calgon is a process of removing permanant hardness of water. Calgon is a complex salt, Sodium hexametaphospahte Na(PO₃)₆ or Na₆P₆O₁₈ .It acts as a ion exchange resin. It is used for softening of water.When hard water containing Ca and Mg ions is reacted with Calgon, it displaces these ions with Sodium ion, by forming a complex with itself and thus the water becomes free of these ions which cause hardness.
Question 8
1 / -0

H₂O₂ as an antispectic is used in the name of

A
percarbonate

B
bleacher

C
perborate

D
perhydrol

Solution

Perhydrol is a solution of hydrogen peroxide (H₂O₂) at a concentration of 30% of weight by volume(w/v) or 100 volume strength.

Perhydrol is a mild antiseptic used on the skin to prevent infection of minor cuts, scrapes, and burns. It may also be used as a mouth rinse to help remove mucus or to relieve minor mouth irritation (e.g., due to canker/ cold sores, gingivitis). This product works by releasing oxygen when it is applied to the affected area. The release of oxygen causes foaming, which helps to remove dead skin and clean the area.
Question 9
1 / -0

Zeolite/permutit process is also called

A
Calgon’s method:

B
Ion-exchange method:

C
Clark’s method

D
Synthetic resins method

Solution

Zeolites/Permutits are sodium alluminium silicates. There process is known as ion exchange process used to remove permanent hardness of water.

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Hydrogen Test - 4

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Hydrogen Test - 4

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Question 1

high heat of vaporisation and low heat of fusion

low freezing point, high boiling point

high freezing point, high boiling point

low heat of vaporisation and high heat of fusion

Solution

Question 2

high heat of vaporisation

high specific heat,

high surface tension

high heat of fusion

Solution

Question 3

114.50

104.50

124.50

109.50

Solution

Question 4

2

5

1

none of these

Solution

Question 5

Density of ice is more than that of water

Density of ice is zero

Density of ice is equal to that of water

Density of ice is less than that of water

Solution

Question 6

hard water

interstitial water

hydrogen-bonded water

coordinated water

Solution

Question 7

removing permanent hardness of water

Causes hardness of water

anion exchange process

cation exchange process

Solution

Question 8

percarbonate

bleacher

perborate

perhydrol

Solution

Question 9

Calgon’s method:

Ion-exchange method:

Clark’s method

Synthetic resins method

Solution

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114.5⁰

104.5⁰

124.5⁰

109.5⁰