Question

Assertion
We feel cold when touching the ice.
Reason
Ice is a solid form of water.
A. If both Assertion and Reason are true and Assertion is the correct explanation for Reason.
B. If both Assertion and Reason are true and Assertion is not the correct explanation for Reason.
C. If Assertion is true and Reason is false
D. If both Assertion and Reason are false statements

Answer 1

Assertion and reasoning statements have to be analysed separately and then the common connection needs to be drawn to be able to solve the question. Always try to find if the statements are correct or not as that eliminates 2 options from the given 4 options. Ice has very low energy as the molecules cannot move freely from one place to another and so kinetic energy becomes very low.

Complete step by step answer:
- Any matter has three forms of its phases which are solid, liquid and gas. Water also has its three forms. Solid form is called ice, liquid form is called water and gaseous form is called water vapour. So we see that the statement given in the reason is correct. This directly eliminates the options C and D.
-Now we need to see the statement given in the assertion. The statement is ‘We feel cold on touching the ice.’ This statement is definitely correct. The temperature of ice is very less. Ice is the solid form of water. Water freezes into ice at ${{0}^{\circ }}C$ and our body temperature is generally ${{98}^{\circ }}C$ This is why we feel the ice to be cold.
-It can be explained on the basis of the heat transfer. Heat is a form of energy and so it can be transferred from 1 place to another or from one body to another. It cannot be created or destroyed. Our body temperature is more than that of ice and so heat transfers from our body to the ice. This is why we feel cold. This process of heat transfer is called thermal conduction.
-It may appear sometimes that the coldness from the ice is entering our body but this is not the case. Coldness is just the absence of heat. It is not any form of energy. Only heat is a quantity and not coldness. Heat always transfers from the body with higher temperature to the body at lower temperature and it continues till both the bodies attain equilibrium.
-Now we need to check if the correct option is A or B. We see that the process of heat transfer has no relation with ice. Heat is transferred due to change of temperature and not due to change of state of matter. If boiling water is placed instead of ice, then heat gets transferred just in the opposite direction.
-So we can say that the assertion and reason both are correct statements in themselves but they have no relationship with one another. They are independent statements and complete statements.
Therefore the correct answer is B. If both Assertion and Reason are true and Assertion is not the correct explanation for Reason.
So, the correct answer is “Option B”.

Note: Always remember that the heat lost from 1 body is always equal to the heat gained by the other body. Heat is also an energy form and so it cannot be destroyed. Also, this occurs ideally only. Practically, some amount of heat is lost but this happens as the heat is lost to the surrounding.