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Metallurgical Engineering Fuels, Furnace And Refractories Technology Difficulty: Medium

The fusion temperature of Chromite brick is

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The half life period of a radioactive element depends upon its Negative climb of dislocation means Metal A nucleates as a spheres in a melt. Assuming Y(liquid/solid surface energy) = 200mJ/m 2 and ΔGv (change in volume free energy) = -10 8 J/M 3 the critical radius (in nm) for stable nuclei is In climb an edge dislocation moves to an adjacent Estimation of total iron in oxide ore comprises of three basic steps namely (i) extraction of iron into solution (ii) oxidation for volumetric analysis or precipitation for gravimetric analysis, and (iii) titration in volumetric analysis or ignition and weighting in gravimetric analysis. Which of the following concentrated acid is used for the first step i.e. extraction of iron into solution?