In a roasting process, the set of conditions that favour sulphate formation from metal sulphide concentrates are.
P. high temperature
Q. high partial pressure of oxygen
R. use of excess air
S. high partial pressure of SO₃

Titanium is produced by

A. electrolytic reduction of TiCl₄

B. calcium reduction of TiCl₄

C. magnesium reduction of TiCl₄

D. thermal dissociation of TiCl₄

Given the following assertion 'A'. and the reason 'R' the correct option is
Assertion A: In Bayer's process, high pressure is used to dissolve alumina from bauxite.
Reason R: Pressure increases the boiling point of water.

A. Both A and R are correct, but R is not the correct reason for A

B. Both A and R are false

C. Both A and R are correct and R is the correct reason for A

D. A is true but R is false

Characteristics of Zinc meta

A. Atomic number: 30, Atomic weight: 65.38

B. Density: 7.13 gm/cm³

C. Melting point: 419.5°C, Boiling point: 910°C

D. All are correct

Match the type of reagent used in floatation in Group 1 with reagent in Group 2.

A. P-2, Q-3, R-4, S-1

B. P-4, Q-2, R-3, S-1

C. P-3, Q-4, R-2, S-1

D. P-1, Q-3, R-2, S-4