Fe(3)O(4) is ferrimagnetic at room tempe...

`Fe_(3)O_(4)` is ferrimagnetic at room temperature but at 850K it becomes::

Paramagnetic

Ferromagnetic

Ferrimagnetic

None of these

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A : Fe_(3)O_(4) is ferrimagnetic at room temperature but becomes paramagnetic at 850 K. R : The magnetic moment in Fe_(3)O_(4) are aligned equally in parallel and antiparallel directions which on heating randomise.

Why is O_2 inert at room temperature ?

Fe_3O_4 is ferrimagnetic at room temperature but becomes paramagnetic at 850K. Explain.

Reduction of Fe_(2)O_(3) with CO is done below 710^@C . Delta_(f) G^(Ө) is negative at this temperature , this process is spontaneous.

Assertion:Substances like Fe_3O_4 and MgFe_2O_4 lose ferrimagnetism on heating and become paramagnetic Reason : Magnetic moments of the domains in these substances are aligned in parallel and antiparallel directions in unequal numbers.

Calculate K_(sp) of Fe_(4)[Fe(CN)_(6)]_(3) at a particular temperature where solubility in water =S mol//L

Magnetite, Fe_(3)O_(4) , can be converted into metallic iron by heating with carbon monoxide as represented by this equation: Fe_(3)O_(4)(s)+CO(g) rarr Fe(s) +CO_(2)(g) The kilograms of Fe_(3)O_(4) which must be processed in this way to obtain 5.00 kg of iron, if the process is 85% efficient is closest to? [M: = Fe = 56]

What happens when ferrimagnetic Fe_(3)O_(4) is heated to 850 K ?

When steam is passed over hot iron, hydrogen is liberated and Fe_(3)O_(4) is formed according to the chemical equation 3 Fe + 4 H_(2)O to Fe_(3)O_(4) + 4 H_(2)(g) . In a typical reaction, 56 g iron was consumed. Calculate the following: The mass of Fe_(3)O_(4) formed. (R.A.M. : H = 1, O = 16, Fe = 56)

A : Silicon is insulator at 0 K but semiconductor at room temperature. R : Conductivity of silicon at room temperature is due to electronic defect.

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