Define:

roasting (1m)

calcination (1m)

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Solution

Roasting is a pyrochemical process in which the ore is heated in the presence of oxygen or air is below its melting point. the products like metal oxide and sulphide ore etc obtained are in solid state. roasting is done in reverberatory furnace.

Ex:-2ZnS+3O2 ----> 2ZnO+SO2

Calcination is also a pyrochemical process in which ore is heated in the absence of air.the is decomposed in this process.

Ex:-MgCO3 ---->MgO+CO2

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F a c t o r i s e : m^{2} - 4 m - m + 4

Q. Two long, straight wires, each carrying a current of 5 A, are placed along the x- and y-axis respectively. The currents point along the positive directions of the axes. Find the magnetic fields at the points (a) (1 m, 1 m), (b) (−1 m, 1 m), (c) (−1 m, −1 m) and (d) (1 m, −1 m).

Two long, straight wires, each carrying a current of 5 A, are placed along the x- and y-axes respectively. The currents point along the positive directions of the axes. Find the magnetic fields at the points (a) (1 m,1 m), (b) (-1 m, 1 m), (c) (-1 m,-1 m) and (d) (1 m,-1 m).

Q. The EMF of the following cells are:

C u | C u^{2 +} (1 M) | | A g^{+} (1 M) | A g, E^{0} = 0.46 V

Z n | Z n^{2 +} (1 M) | | C u^{2 +} (1 M) | C u, E^{0} = 1.10 V

The EMF of the cell

Z n | Z n^{2 +} (1 M) | | A g^{+} (1 M) | A g

will be:

Q. The emf

(E^{\circ})

of the following cells are:

A g / A g^{+} (1 M) ∥ C u^{2 +} (1 M) | C u; E^{\circ} = - 0.46 v o l t

Z n / Z n^{2 +} (1 M) ∥ C u^{2 +} (1 M) | C u; E^{\circ} = + 1.10 v o l t

Calculate the emf of the cell:

Z n | Z n^{2 +} (1 M) ∥ A g^{+} (1 M) | A g

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Define: roasting (1m) calcination (1m)

Define:

roasting (1m)

calcination (1m)