MPSC Rajyaseva 2013 GS Paper 1 — Question 67
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पांढऱ्या कपड्यावर पडलेला वरणाचा डाग साबण लावल्यावर लालसर तपकिरी (रेंडिश ब्राउन) होतो. तो अधिक पाण्याने धुतल्यावर पुन्हा पिवळा होतो. तो आधी लालसर तपकिरी (रेंडिश ब्राउन) होतो कारण - A stain of curry on a white cloth becomes reddish brown when soap is scrubbed on it. It turns yellow again when the cloth is washed with plenty of water. It had turned reddish brown because :
1)साबण निसर्गत: बेसिक आहे. / Soap is basic in nature✓ Correct
2)साबण निसर्गत: अँसिडीक आहे. / Soap is acidic in nature
3)साबण न्यूट्रल आहे. / Soap is neutral
4)वरील एकही पर्याय योग्य नाही. / None of the above
Curry contains turmeric, which acts as a natural indicator. Soap is basic in nature, changing turmeric's color to reddish brown, which reverts when diluted.