Statement A: Heat is absorbed by a substance during melting and boiling
Statement A : Heat is released from a substance duringfreezing and liquification
A) A is true, B is false
B) A is false, B is true
C) Both are true
D) Both are false
1 Answers
Talk Doctor Online in Bissoy App
Fill in the blanks If heat energy is given to a substance and its temperature remains constant then the substance undergoes a change in_______.
Correct Answer - state
2 Answers 1 views
Fill in the blanks Substance through which heat travels easily and quickly are said to be _________of heat.
Correct Answer - good conductors
2 Answers 1 views
Why is density of liquid at melting point nearly same as density of solids at melting point?
1. During change of state from solid to liquid, mass of substance does not change. 2. Also, mean distance between particles during change of state does not alter at melting point. 3....
2 Answers 1 views
For some change in temperature the amount of heat absorbed by a substance is directly proportional to …………………
Correct option is A) mass
2 Answers 1 views
1 gm of water at 20°C is heated till its temperature raises to 21 °C. The amount of heat energy absorbed by the water is ………………..
Correct option is B) 1 calorie
2 Answers 1 views
1 kg of water at 300 K is heated till its temperature raises to 301K. The amount of heat energy absorbed by the water is …………………..
Correct option is C) c,d
2 Answers 1 views
The latent heat of fusion of a solid ‘ substance of mass “m” is L. The required amount of heat to change solid phase to liquid phase is ……………… cal.
Correct option is A) Q = mL
2 Answers 1 views
A piece of ice falls from a height h so that it melts completely. Only one — quarter of the heat produced is absorbed by the ice and all energy
(A) 136 km When the piece of ice falls from the height h, it possesses potential energy, mgh. This P.E. is converted to heat energy. ∴ Q = mgh But only \(\frac{1^{th}}{4}\) of it is absorbed...
2 Answers 1 views
The melting point of substance depends ………….. on among the particles.
A) force of attraction
2 Answers 1 views
In the presence of a catalyst heat evolved or absorbed during reaction
(c) remains unchanged. Catalyst only eases the threshold for a reaction without participating directly in it. So, it has no effect on heat evolved or absorbed during reaction.
2 Answers 1 views