Object a at 40.°c and object b at 80.°c are placed in contact with each other. which statement describes the heat flow between the objects?
(1) heat flows from object a to object b.
(2) heat flows from object b to object a.
(3) heat flows in both directions between the objects.
(4) no heat flow occurs between the objects.

The correct option is 2.

Explanation: Heat flow is defined as the transfer of energy from hotter object to cooler object when two objects are kept together at different temperatures. As the energy remains conserved, so the heat flow will take place until the equilibrium is attained.

In the above asked question, Object A is at 40° C and Object B is at 80° C.

Object B is at higher temperature, so the heat flow will take place from Object B to Object A.

Hence, the correct option is 2.

The correct answer is (2) Heat flows from object B to object A

The explanation:

The object B at 80°C and the object A at 40°C so, here object B is higher than

object A at heat and temperature.

and when the heat flow from the object of higher temperature to the lower one and start to lose heat so, the correct answer is (2)

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

c, liquids evaporate, creating a gas