Which of the following statements about oxidation is correct?
A. It always involves oxygen.
B. It involves loss of electrons.
C. It involves gain of electrons.
D. It involves decrease in oxidation number.
Answer: Option B
Solution (By JKExamLibrary)
Oxidation is defined as loss of electrons, increase in oxidation number, or loss of hydrogen / gain of oxygen. Reduction is gain of electrons. Oxidation does not always require oxygen; for example, 2Na + Cl₂ → 2NaCl involves oxidation of Na without oxygen.
Explanation:
Radioactive decay is a first-order process because the rate of decay is proportional to the number of radioactive nuclei present. Half-life is constant, independent of initial amount.
Explanation:
Fossil fuels (coal, petroleum, natural gas) are formed from organic matter deposited in sedimentary layers, subjected to heat and pressure over geological timescales. They are non-renewable because their formation takes millions of years.
Explanation:
Alpha particles (α) are positively charged particles consisting of two protons and two neutrons, identical to the nucleus of a helium-4 atom (He²⁺). They are emitted during alpha decay of heavy radioactive elements like uranium and radium.
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