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Some strong bases are NaOH, KOH, Ba(OH)₂, Ca(OH)₂ etc.
1) Litmus test - They turn red litmus Blue.
2) Turmeric - Natural Indicator - Turns red in basic solutions.
3) Extract of red cabbage - Natural indicator - It remains red in acidic solutions, but turns green when added to basic solutions.
4) Phenolphthalein - Turns Pink/Red with bases
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