Question

pls give the answers for the following question in the picture


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Answer 1

Leaching is used when the ore is soluble in a solvent. The powdered ore is dissolved in a chemical, usually a strong solution of NaOH. The chemical solution dissolves the metal in the ore and it can be extracted and separated from the gangue by extracting the chemical solution.

Answer 2

Answer:

weak, short-range electrostatic attractive forces between uncharged molecules, arising from the interaction of permanent or transient electric dipole moments.

Explanation:

F_{VW}(r)=- \frac {AR_1R_2}{(R_1+R_2)6r^2}

F_{VW} = van der Waals force

R_1, R_2 = spherical bodies radii

A = Hamaker constant

r = the distance between the surfaces