25%(A) a is true but r is false ( 1 voter )
25%(B) a is false but r is true ( 1 voter )
50%(C) both a and r are true, and r is the reason for a ( 2 voters )
0%(D) both a and r are true, but r is not the reason for a
Based On 4 Votes
GATE MT 2013 Q42. Determine the correctness or otherwise of the following Assertion (a) and Reason (r). 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.