The indicator that is pink in a basic solution and colorless in an acidic solution is:
A. Litmus
B. Phenolphthalein
C. Turmeric
D. Methyl orange
Answer: Option B
Solution (By JKExamLibrary)
Phenolphthalein is a synthetic indicator that remains colorless in acidic and neutral solutions but turns pink/magenta in basic solutions. Methyl orange is red in acid and yellow in base. Litmus is red in acid and blue in base. Turmeric is yellow in acid and red in base.
Explanation:
Ozone (O₃) is a powerful disinfectant that decomposes to O₂, leaving no residual taste or odor. However, it must be generated on-site and provides no lasting protection. Chlorine leaves residual.
Explanation:
Water hardness is primarily caused by the presence of dissolved multivalent cations, most commonly calcium (Ca²⁺) and magnesium (Mg²⁺) ions, usually in the form of bicarbonates, chlorides, or sulfates. Sodium and potassium salts do not cause hardness.
Explanation:
Alpha particles, being heavy and doubly charged, cause intense ionization over a short distance. They are least penetrating. Gamma has low ionization but high penetration.
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