Correct Answer - Option 3 : Basic in nature
The correct answer is Basic in nature.
A stain of curry on a white cloth becomes reddish-brown when soap is used because the soap is Basic in nature.
- A pH value is greater than 7 is basic in nature. Examples are Ca(OH)2, NaOH, NaHCO3.
- Bases turn red litmus to blue.
- Bases also react with some metals to liberate hydrogen gas.
- Oxides and hydroxides of metals are bases.
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Water-soluble bases are called alkali. Example NaOH, KOH
- All alkalies are bases but all bases are not alkalies because all bases are not soluble in water.
- Alkaline gives off OH- ions in water.
Acid
- The sour taste of organic food materials is mainly caused by the presence of acidic materials.
- Acids are sour in taste with a pH of less than 7. Examples are Vinegar, Tartaric acid, Citric acid, and Malic acid.
- Acids give off H+ ions in water.
- Acids turn blue litmus to red.
Neutralization
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Acid and base react together to form salt and water and this reaction is known as neutralization.
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Water is neutral with a pH value equal to 7.
