JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
A cup of water at \(5^{\circ}C\) (system) is placed in a microwave oven and the oven is turned on for one minute during which, the water begins to boil. Which of the following option is true ?
- A \(q=+ve, w=0, \Delta U=-ve\)
- B \(q=+ve, w=-ve, \Delta U=+ve\)
- C \(q=-ve, w=-ve, \Delta U=-ve\)
- D \(q=+ve, w=-ve, \Delta U=-ve\)
Answer & Solution
Correct Answer
(B) \(q=+ve, w=-ve, \Delta U=+ve\)
Step-by-step Solution
Detailed explanation
\(\underset{5^{\circ} C }{ H _2 O (\ell)} \longrightarrow \underset{100^{\circ} C }{ H _2 O (\ell) \rightleftarrows} \underset{100^{\circ} C }{ H _2 O ( g )}\) due to expansion \(W=-ve\) as heat is given to system so \(q = +ve\) and internal energy of gas will be more than…
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