What happens when ferrimagnetic Fe3O4 is heated to 850 K and why?

What happens when ferrimagnetic Fe3O4 is heated to 850 K and why?
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1 Answer

Answer :

Fe3O4 on heating to 850 K becomes paramagnetic. This is due to greater alignment of domains in one direction on heating.
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(a) What happens when a Ferromagnetic or Ferrimagnetic solid is heated ? (b) The ions of MgO and NaF all have the same number of electrons and intermolecular distance are about the same (235 & 215 pm). Why are the melting points are so different (2642 °C & 992 °C ?

Description : (a) What happens when a Ferromagnetic or Ferrimagnetic solid is heated ?  (b) The ions of MgO and NaF all have the same number of electrons and intermolecular distance are about the same (235 & 215 pm). Why are the melting points are so different (2642 °C & 992 °C ?

Last Answer : (a) It changes into paramagnetic at hight temperature due to randomization of spins.  (b) The ions in MgO carry two unit charges. In NaCl only one unit charge. Hence electrostatic forces of attraction in MgO are stronger.

Explain the fallacy of oxidation state in Fe3O4?

Description : Explain the fallacy of oxidation state in Fe3O4?

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In which of the following states maximum iron ore is found ? (1) FeCO3 (2) Fe2O3 (3) Fe3O4 (4) FeS2

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What happens when Calcium carbonate is heated to 1200 K?

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Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2 (g) (a) Iron metal is getting oxidized. (b) Water is getting reduced. (c) Water is acting as reducing agent. (d)Water is acting as oxidizing agent. A) (A), (B) & (C) B) (C) & (D) C) (A), (B) & (D) D) (B) & (D)

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Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2 , is not practised, as it is (A) A slow reaction (B) A discontinuous reaction (requiring regeneration of iron by water gas intermittently) (C) Still in development stage (by employing fluidised bed technique) (D) All (A), (B) and (C)

Description : Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2 , is not practised, as it is (A) A slow reaction (B) A discontinuous reaction (requiring regeneration of ... in development stage (by employing fluidised bed technique) (D) All (A), (B) and (C)

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What happens when nitrates of alkaline earth metal is heated?

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What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?

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how do i round 850 to the nearest hundred?

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How much space does the ProForm 850 Elliptical take up?

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Which is bigger 850 grams or 8 kilogram?

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What is the final ratio of the rear axle of the Ford F-850 Truck year 1967?

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A company has issued a 20-year bond at Rs. 1000 par value with a coupon rate of 10 per cent. The required rate of return on similar bonds is 12 per cent. What is the current value of the bond ? (A) Rs. 905•33 (B) Rs. 850•45 (C) Rs. 833•33 (D) Rs. 820•20

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Calculate the bearing life if expected life for 90% bearings is 9000 hr and the shaft is rotating at 1500 rpm. (a) 850 million rev (b) 810 million rev (c) 810 hr (d) 850 hr

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Transmission of oil should be changed after every working hours about a) 550 hours b) 650 hours c) 70 hours d) 850 hours

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