Which is not correct statement ?...

Which is not correct statement ?

Casseterite, chromite and haematitie are concentrated by hydraulic washing (Tabling).

Pure `Al_(2)O_(3)` is obtained from the bauxite ore by leaching in the Bayer's process

Sulphide ore is concentrated by calcination method

Roasting can convert sulphide into oxide or dulphate and part of sulphide may also act as a reducing agent

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Which is the correct statement ?

Isotopes are always radioactive species .

Beta rays are always negatively charged particles .

Alpha rays are always negatively charged particles .

Gamma rays can deflected by a magnetic field .

Minimum boiling azeotropic mixture boils at temperature lower than either of the two pure components.

Maximum boiling azeotropic mixture boils at temperature higher than either of the two pure components.

Minimum boiling azeotropic mixture shows (+)ve deviation

Maximum boiling azetropic mixture shows (-)ve deviation.

Minimum boiling azeotropic mixture boils at a temperature higher than either of the two components

Maximum boiling azeotropic mixture boils at temperature lower than either of the two components

Minimum boiling azeotropic mixture shows positive (+ve) deviation

Maximum boiling azeotropic mixture shows nagative (-ve) deviation.