KVPY Government Jobs Exams

In the conversion of zinc ore to zinc metal, the process of roasting involves
(A) ZnCO3 → ZnO (B) ZnO → ZnSO4 (C) ZnS → ZnO (D) ZnS → ZnSO4

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KVPY Other Question

After 2 hours the amount of a certain radioactive substance reduces to 1/16th of the original amount (the
decay process follows first-order kinetics). The half-life of the radioactive substance is
(A) 15 min (B) 30 min (C) 45 min (D) 60 min The number of P-H bond(s) in H3PO2, H3PO3 and H3PO4, respectively, is
(A) 2, 0, 1 (B) 1, 1, 1 (C) 2, 0, 0 (D) 2, 1, 0