The condition of Efflorescence
The condition of Efflorescence
The correct option is D Vapour pressure of hydrated crystal > atmospheric vapour pressure
The explanation for the correct option
(D)Vapour pressure of hydrated crystal > atmospheric vapour pressure
Efflorescence
- The phenomenon in which a compound loses its water of crystallization on exposure to dry air is called efflorescence and substances are said to be efflorescent substances.
- Due to this phenomenon hydrated salts when left exposed to the atmosphere lose their water of crystallization and crumble down to form a powder.
- The higher the temperature of the air, the higher the efflorescence. This is due to the air absorbing more water with an increase in temperature and decrease in moisture.
- The condition for efflorescence is Vapour pressure of hydrated crystal > atmospheric vapour pressure
The explanation for the incorrect option
(A) Vapour pressure of hydrated crystal < atmospheric vapour pressure. This condition is incorrect. the real condition is exactly the opposite of this
(B)Vapour pressure of hydrated crystal ≤ atmospheric vapour pressure. This condition is incorrect. the real condition is Vapour pressure of hydrated crystal > atmospheric vapour pressure
(C)Vapour pressure of hydrated crystal = atmospheric vapour pressure. This condition is incorrect. vapour pressure of hydrated crystal is not equal to atmospheric vapour pressure, but vapour pressure of hydrated crystal is greater than the atmospheric vapour pressure
Thus option (D)Vapour pressure of hydrated crystal > atmospheric vapour pressure is the condition of Efflorescence
Vapour pressure of hydrated crystal > atmospheric vapour pressure
The explanation for the correct option
(D)Vapour pressure of hydrated crystal > atmospheric vapour pressure
Efflorescence
- The phenomenon in which a compound loses its water of crystallization on exposure to dry air is called efflorescence and substances are said to be efflorescent substances.
- Due to this phenomenon hydrated salts when left exposed to the atmosphere lose their water of crystallization and crumble down to form a powder.
- The higher the temperature of the air, the higher the efflorescence. This is due to the air absorbing more water with an increase in temperature and decrease in moisture.
- The condition for efflorescence is Vapour pressure of hydrated crystal > atmospheric vapour pressure
The explanation for the incorrect option
(A) Vapour pressure of hydrated crystal < atmospheric vapour pressure. This condition is incorrect. the real condition is exactly the opposite of this
(B)Vapour pressure of hydrated crystal ≤ atmospheric vapour pressure. This condition is incorrect. the real condition is Vapour pressure of hydrated crystal > atmospheric vapour pressure
(C)Vapour pressure of hydrated crystal = atmospheric vapour pressure. This condition is incorrect. vapour pressure of hydrated crystal is not equal to atmospheric vapour pressure, but vapour pressure of hydrated crystal is greater than the atmospheric vapour pressure
Thus option (D)Vapour pressure of hydrated crystal > atmospheric vapour pressure is the condition of Efflorescence
