Which of the following is a radioactive isotope used in the treatment of cancer?
A. Sodium-23
B. Cobalt-60
C. Phosphorus-31
D. Carbon-12
Answer: Option B
Solution (By JKExamLibrary)
Cobalt-60 emits gamma rays used in radiotherapy to destroy cancerous cells. Carbon-12 and sodium-23 are stable. Phosphorus-32 is radioactive but used as tracer, not for cancer therapy.
Explanation:
In both electrolytic and galvanic cells, oxidation occurs at the anode (AN OX). The anode is positive in electrolytic cells, negative in galvanic. Reduction at cathode (RED CAT). Electroplating: object at cathode, dissolution at anode.
Explanation:
Manganese is extracted by the aluminothermic process (Goldschmidt thermite process) where Mn₃O₄ is reduced by aluminium: 3Mn₃O₄ + 8Al → 9Mn + 4Al₂O₃. This works for metals with less reactivity than Al but not too reactive. Sodium is extracted by electrolysis. Iron is extracted by smelting with coke. Zinc by carbon reduction/electrolysis.
Explanation:
Two or more substances (SO₂ and O₂) combine to form a single product (SO₃). This is a combination reaction. It is also a redox reaction and is catalyzed by V₂O₅ in the Contact process for sulfuric acid. Decomposition is the opposite (breaking down). Displacement involves replacement of an element.
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