When a solution turns red litmus blue, its pH is likely to be:
A. 7
B. 1
C. 4
D. 10
Answer: Option D
Solution (By JKExamLibrary)
Red litmus turning blue indicates that the solution is basic. Basic solutions have a pH greater than 7. Among the options, 10 is the only value greater than 7. pH 1 and 4 are acidic (turn blue litmus red), and 7 is neutral (no change in litmus color).
Explanation:
Ionic compounds consist of oppositely charged ions held together by strong electrostatic forces (ionic bonds). This results in high melting points and solubility in polar solvents.
Explanation:
Rusting involves anodic oxidation of iron (Fe → Fe²⁺ + 2e⁻) and cathodic reduction of oxygen (O₂ + 2H₂O + 4e⁻ → 4OH⁻) in the presence of water acting as electrolyte. CO₂ can form carbonic acid accelerating it, but not required. Nitrogen is inert. High temperature alone doesn't cause rusting without moisture and oxygen.
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