It is known that wax contracts on solidificat | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Substances are generally classified into two categories based on their volume change during solidification:$(i)$ Substances like water,which expan

Vedclass · Accepted Answer

It will start solidifying from the bottom upward

Vedclass · Answer

(B) Substances are generally classified into two categories based on their volume change during solidification:$(i)$ Substances like water,which expand upon solidification. For these substances,the melting point decreases with an increase in pressure.$(ii)$ Substances like wax,ghee,etc.,which contract upon solidification. For these substances,the melting point increases with an increase in pressure.When molten wax is cooled in a large vessel,the pressure at the bottom is higher than at the top due to the weight of the liquid column. Since the melting point of wax increases with pressure,the wax at the bottom reaches its solidification temperature first as the temperature drops. Therefore,solidification begins from the bottom and proceeds upward.

It is known that wax contracts on solidification. If molten wax is taken in a large vessel and it is allowed to cool slowly,then

Similar Questions

$A$ thin-walled cylindrical metal vessel with a linear coefficient of expansion $10^{-3} \ ^\circ C^{-1}$ contains benzene with a volume expansion coefficient of $10^{-3} \ ^\circ C^{-1}$. If the vessel and its contents are heated by $10 \ ^\circ C$,the pressure due to the liquid at the bottom:

$Assertion :$ In the pressure-temperature $(P-T)$ phase diagram of water,the slope of the melting curve is found to be negative.
$Reason :$ Ice contracts on melting to water.

If two balls of the same metal weighing $5\, g$ and $10\, g$ strike a target with the same velocity,and the heat energy developed is used solely for raising their temperature,then the temperature rise will be higher:

$A$ block of ice at $-20\,^oC$ having a mass of $2\, kg$ is added to $3\, kg$ of water at $15\,^oC$. Neglecting heat losses and the heat capacity of the container,which of the following is true?

On which of the following four processes does the functioning of a bimetallic strip depend?
$(i)$ Radiation
$(ii)$ Energy conversion
$(iii)$ Melting
$(iv)$ Thermal expansion

Vedclass Test Series

Exam Paper Generator

Online Exam Module