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What are the tests done for molding sand?

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In Pidgeon process, the reducing agent used is The two partials repel each other and want to be as far as possible Equivalent diameter of a particle is the diameter of the sphere having the same as the actual particle. Match the microstructural state of the following steels with. their respective heat treatments Group-I Group-II P. Eutectoid steel homogenised at 900°C and quenched in water at room temperature 1. Ferrite, martensite and retained austenite Q. A 0.4% C steel soaked at 750°C and quenched in water at room temperature. 2. Pearlite and carbide R. Normalised 1%C steel. 3. Martensite and retained austenite S. Eutectoid steel subjected to normalising 4. Pearlite Decomposition of calcium carbonate occurs as: CaCO 3 = CaO + CO 2 : ΔG 0 T = 17710 - 158T J. mol -1 What will be the decomposition temperature (in K) of CaCO 3 , if the activity of CaO is 0.5 and the pressure is 3 atmospheres?