2 public questions tagged with this topic.
Dissolved oxygen concentration decreases with increase in water temperature, inverse relationship.
Ref: CPCB — Water Pollution Guidelines, NCERT Biology Water Quality
0.3×127.7×(400−T) = (0.7×4186+0.1×900)×(T−15). 15324−38.31T = (2930.2+90)×(T−15) = 3020.2T−45303. 15324+45303 = 3020.2T+38.31T. 60627 = 3058.51T⇒T≈19.82∘C≈19.8∘C. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 19.8°C. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Ref: NCERT Class 11 Physics, Chapter 11: Thermal Properties – Calorimetry.
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