Determine the correctness or otherwise of the following
Assertion: For the extraction of metal values from their sulphide concentrates by hydrometallurgical route, leaching with oxygen under high pressure is used.
Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in leaching of the values.

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