Specific Heat

Q.

Ice at 0 degrees Celcius is more effective in cooling as compared to water at 0 degrees Celcius. Why?

Q.

why is ice at 273 Kelvin more effective in cooling than water at the same temperature

Q.

What is the specific heat capacity of water?

1. 4.18 J/ g C

2. 4.18 Cal

3. 4.18 kJ / g C

4. 4.18 J Kg / C

Q.

(a) Which property of water enables it to modify the climate?

(b) The density of water varies with temperature. What are its consequences?

(c) State the melting point, boiling point, specific heat capacity, specific latent heat of fusion and specific latent heat of vaporization of water.

Q.

The freezing and boiling points of a substance P are -220℃ and -185℃ respectively. At which of the following range of temperatures will P exist as a liquid? (A) Between -175℃and -210℃ (B) Between -190℃ and -225℃ (C) Between -200℃ and -160℃ (D) Between -195℃ and -215℃

Q.

Explain why :

(a) Water is an excellent liquid to use in cooling systems.

(b) A solution is always clear and transparent.

(c) Lakes and rivers do not suddenly freeze in the winters.

(d) The solute cannot be separated from a solution by filtration.

(e) Fused $CaC{l}_2$ or conc. $H_{2}S{O}_4$ is used in a desiccator.

(f) Effervescence is seen on opening a bottle of soda water.

Q.

The specific latent heat of vapourization of water is _______ .

1. 80 kcal/kg

2. 1 cal/g

3. 540 cal/g

4. 226 cal/kg

Q.

What is the anomalous expansion of water? Please explain.

Q. Dry ice leaves no residue when kept open at room temperature, while regular ice leaves water behind in the same process.
Which of the following conclusions is correct?

1. Regular ice sublimes, while dry ice evaporates
2. Dry ice sublimes, while regular ice evaporates
3. Dry ice sublimes, while regular ice melts
4. Regular ice sublimes, while dry ice melts

Q. An ice of -2℃ temperature of 0.5kg has dropped into75℃ water of 1kg
(A)what is latent heat ? Find the mixture temperature

Q. Amount of heat energy required to raise the temperature of 2 gram of water at X°C to (X+1)°C is how much ?

Q. An exothermic process going from state A to state B. What happens to the process when the temperature is increased?

1. From state A to state B
2. From state B to state A
3. \N
4. \N

Q.

Assertion: A liquid-gas mixture can be separated by boiling.

Reason: The solubility of a gas in a liquid decreases with increase in temperature.

1. Assertion and reason are correct, but reason is not the correct explanation of assertion.

2. Assertion is correct, but reason is incorrect.

3. Assertion and reason are correct, and reason is the correct explanation of assertion.

4. Assertion is incorrect, but reason is correct.

Q.

What is the specific heat capacity of water?

1. 4.18 calories

2. 4.18 J/ g Celsius

3. 4.18 kJ / g Celsius

4. 4.18 J g / Celsius

Q.

define water equivalent of a calorimeter?

Q. A block of ice at $-{10}^{o}C$ is slowly heated and converted to steam at ${100}^{o}C.$ Which of the following curves represents the phenomenon qualitatively?

1. 
2. 
3. 
4. 

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What is the anomalous expansion of water, and how does it help aquatic life?

Q. Ammonium chloride is separated from a mixture of sodium chloride and ammonium chloride by the process of _____________.

1. Sublimation
2. Evaporation
3. All of these
4. Distillation

Q. Ice at zero centigrade has greater cooling effect than water at $0^{\circ }C$.

1. True
2. False

Q. The heating curve for ice initially at a particular pressure is given.

Choose the correct heating curve for the ice initially at $0{}^{\circ }\text{C}$, if the pressure is decreased.

1. 

2. 

3. 

4. 

Q.

Molar heat capacity of water in equilibrium with the ice at constant pressure is?

Q.

ten calories of heat are added to two grams of liquid water.The temperature of the water (specific heat capacity of water is 1caloriegm degree C)

Q. a glass tumbler containing hot water is kept in the freezer compartment of a refrigerator ( temperature <0⁰C). what would be the temperature trend?