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Byju's Answer

Standard VIII

Geography

Atmosphere

In which of t...

Question

In which of the following cases the temperature recorded will be the lowest and why ?
100 gm of ice

100 gm of ice +20 gm of common salt

100 gm of ice + 10 gm of common salt

100 gm of ice + 10 gm of salt

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Solution

The temperature will be recorded lowest in the case having 100 g of ice and 20 g of common salt. When we add salt, the freezing temperature of ice lowers due to the depression in freezing point of the water. Higher the concentration of salt, higher will be the depression in freezing point and lower will be the temperature.

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10gm of ice at $- 20^{\circ}$ is dropped into a calorimeter containing 10gm of water at $10^{\circ} C$ , the specific heat of water is twice that of ice. When equilibrium is reached the calorimeter will contain.

Q. 20 gm ice at

- 10^{o} C

is mixed with m gm steam at

100^{o} C

. Minimum value of m so that finally all ice and steam converts into water. (Use

S_{i c e} = 0.5

c a l / g m^{o} C

S_{w a t e r} = 1

c a l / g m^{o} C

, L(melting)=80 cal/gm and L (vapourization)=540 cal/gm)

Q. A

10

gm ice cube is dropped into

45

gm of water kept in a glass. If the water was initially at a temperature of

28^{o} C

and the temperature of ice

- 15^{o} C

, find the final temperature (in

^{o} C

) of water. (Specific heat of

i c e = 0.5 c a l / g m /^{o} C

and

L = 80 c a l / g m

)

Q. Mixing is being done of

m

g m

of steam at

100^{0} C

is mixed with

31.50 g m

ice at

- 20^{0} C .

Take

s_{i c e} = s_{s t e a m} = 0.5 c a l / g m^{0} C,

s_{w a t e r} = 1 c a l / g m^{0} C

and the latent heat of fusion and vaporization is

80 c a l / g m

and

540 c a l / g m

respectively.The final temperature is found to be

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Determine the final result when 200 gm of water and 20 gm of ice at $0^{\circ} C$ are in a calorimeter having a water equivalent of 30 gm. 50 gm of steam is passed into it at $100^{\circ} C$ . Take latent heat of fusion 80 cal/gm and latent heat of vaporization as 540 cal/gm

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In which of the following cases the temperature recorded will be the lowest and why ? 100 gm of ice 100 gm of ice +20 gm of common salt 100 gm of ice + 10 gm of common salt 100 gm of ice + 10 gm of salt

In which of the following cases the temperature recorded will be the lowest and why ?
100 gm of ice

100 gm of ice +20 gm of common salt

100 gm of ice + 10 gm of common salt

100 gm of ice + 10 gm of salt