Hydrogen - Online Test

Answer : Option C
Explaination / Solution:

Water has high freezing point and boiling point because of strong intermolecular hydrogen bonding interactions.

Answer : Option B
Explaination / Solution:

Heat of vapourisation is the responsible factor.

Answer : Option B
Explaination / Solution:

Answer : Option A
Explaination / Solution:

An amphoteric compound is a compound that can act either as an acid, or as a base in a chemical reaction.

A first example of water's amphoteric character is the fact that it can self-ionize to a small extent.  A water molecule is capable of donating one of its protons (H+) to a neighbouring water molecule, forming the hydroxyde and hydronium ions.

H2O+H2O⇌H3O++OH−

Answer : Option A
Explaination / 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.

Answer : Option D
Explaination / 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.

Answer : Option B
Explaination / 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.

Answer : Option D
Explaination / 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.

Answer : Option B
Explaination / 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.

Answer : Option D
Explaination / Solution:

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