Assertion (A): Silver and gold occur in the free state in nature. Reason (R): They are highly reactive metals.
A. Both A and R are true and R is the correct explanation of A.
B. A is false but R is true.
C. Both A and R are true but R is NOT the correct explanation of A.
D. A is true but R is false.
Answer: Option D
Solution (By JKExamLibrary)
Silver and gold are noble metals and occur in the free (native) state in nature because they are extremely unreactive (least reactive), not highly reactive. They do not readily combine with oxygen, moisture, or acids. Thus, A is true, but R is false.
Explanation:
Boyle's law: P₁V₁ = P₂V₂. So P₂ = P₁(V₁/V₂) = P₁(10/20) = P₁/2. Pressure is halved. If volume doubles, pressure halves, assuming constant temperature and amount. This is an inverse relationship.
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.
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