A solution with pH = 3 is how many times more acidic than a solution with pH = 5?
A. 10 times
B. 1000 times
C. 2 times
D. 100 times
Answer: Option D
Solution (By JKSSB Mock Tests)
pH is a logarithmic scale: pH = -log[H⁺]. A difference of 1 pH unit corresponds to a tenfold change in [H⁺]. pH 3 vs pH 5 → difference = 2, so [H⁺] at pH 3 is 10² = 100 times greater than at pH 5. Thus, the solution is 100 times more acidic. Similarly, pH 10 is 100 times more basic than pH 8. Always remember: ΔpH = n, ratio = 10ⁿ.
Explanation:
Half-life is a characteristic of first-order kinetics, and all radioactive decay follows first-order kinetics. Hence it applies to all radioactive decay processes. Chemical reactions of first order also have constant half-life independent of initial concentration, but radioactive decay is the prime example. Zero-order half-life depends on initial concentration.
Explanation:
The ignition temperature (or kindling temperature) is the minimum temperature to which a fuel must be heated so that it catches fire and starts burning spontaneously. A lower ignition temperature means the fuel is more highly flammable and can ignite more easily at ambient conditions.
Consider the following statements: 1. Chromatography separates components based on differential adsorption. 2. The component that is more strongly adsorbed moves faster. Which statement(s) is/are correct?
Explanation:
Chromatography is an advanced technique used to separate mixtures based on the differential adsorption of components onto a stationary phase. The component that is more strongly adsorbed to the stationary phase moves slower, not faster. Therefore, only statement 1 is correct, making option A the right choice.
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