Question
Question: Which of the following would raise the temperature of 20 gm water at 30<sup>0</sup>C most. (Specific...
Which of the following would raise the temperature of 20 gm water at 300C most. (Specific heat of water = 1 cal/gm0C) –
A
30 gm water at 400C
B
10 gm water at 500C
C
20 gm water at 700C
D
5 gm water at 800C
Answer
20 gm water at 700C
Explanation
Solution
Let "m" gm at T0C is added so that final temperature of mixture become T¢0C.
20 × 1 × (T¢ – 30) = m × 1 × (T – T¢)
Ž 20T¢ – 600 = mT – mT¢
T¢ =20+m600+mT
For "C" it comes out to be maximum.