Water at `0^@C` was heated until it started to boil and then until it all changed to steam. The time required to heat water from `0^@C` to `100^@C` is 5 min and the time to change boiling water to steam is 28 minutes. If the flame supplied heat at a constant rate, the specific latent heat of vaporisation of water (neglecting heat losses, container etc. is (in `J//g`). (specific heat of water s `=4.2 J//g` )A. 540B. 2268C. 2352D. 2356

Water at `0^@C` was heated until it started to boil and then until it

1.	Water at `0^@C` was heated until it started to boil and then until it all changed to steam. The time required to heat water from `0^@C` to `100^@C` is 5 min and the time to change boiling water to steam is 28 minutes. If the flame supplied heat at a constant rate, the specific latent heat of vaporisation of water (neglecting heat losses, container etc. is (in `J//g`). (specific heat of water s `=4.2 J//g` )A. 540B. 2268C. 2352D. 2356
Answer» Correct Answer - C Let heat is supplied at constant rate P, For `0^@C` to `100^@C` `Pxx(5xx60)=mxx4.2xx(100-0)` .(i) For boiling: `Pxx(28xx60)=mL` ..(ii) From (i) and (ii) `L=(4.2xx100)xx(28)/(5)=2352 J//g`

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