The pH of a solution is 4.5. What is the nature of the solution?
A. Strongly acidic
B. Basic
C. Neutral
D. Weakly acidic
Answer: Option D
Solution (By JKSSB Mock Tests)
pH < 7 indicates acidic. Since 4.5 is less than 7 but not extremely low (like 1-2), it is weakly acidic. Neutral pH=7, basic pH>7. A solution with pH 4 is more acidic than pH 5.
Explanation:
Highly reactive metals like sodium, potassium, calcium, and aluminum cannot be reduced by chemical reducing agents like carbon. They are extracted by the electrolysis of their molten chlorides or oxides. For example, sodium is extracted by the electrolysis of molten NaCl in the Down's cell.
Explanation:
Niels Bohr proposed his model in 1913 to overcome the defects of Rutherford's model. He stated that electrons revolve around the nucleus in specific, discrete circular orbits (shells) with fixed energy, and they do not radiate energy while in these orbits, explaining atomic stability.
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