The answer is (2) 12mL. The reaction equation is NaOH + HCl = NaCl + H2O. So the mol number of NaOH is equal to HCl. The concentration of NaOH is twice of HCl so the volume of HCl is twice of NaOH.
Carbon monoxide poisoning has certain symptoms in order to detect its presence but development of mees lines on the figer and toe nails does not include on its symptoms. Mees lines appears if the person experience poisoning of thallium, arsenic or other heavy metals. Mees lines also appear if the person is experiencing or suffering from renal failure.
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Cotton Balls are soft and pine cones are hard.