एक प्रथम कोटि की अभिक्रिया का अर्ध आयु काल 15 मिनट है इस अभिक्रिया के 90% अंश पूर्ण होने में लगने वाले समय की गणना कीजिए
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The plants grow deep roots to gather water that is far down under the surface of the earth. At such a deep level, the water evaporates from the desert heat much slower than it does closer to the surface.
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