Explanation

• Methyl orange is a pH indicator that changes color in response to changes in acidity or basicity.
• In an acidic medium, it is orange (or red), and in a basic medium, it turns yellow.

Explanation

• Bromophenol blue is a pH indicator that changes color in response to changes in acidity or basicity.
• In an acidic medium, it is yellow, and in a basic medium, it turns blue.

Explanation

• Phenolphthalein is a pH indicator that changes color in response to changes in acidity or basicity.
• In an acidic medium, it is colorless, and in a basic medium, it turns pink.

Explanation

Ammonia has a pH level of around 11-12, which is strongly alkaline (basic).

Explanation

The correct order from least to most acidic:

• Ammonia (pH 11-12, strongly basic)
• Blood (pH 7.4, slightly basic)
• Milk (pH 6.5-7, slightly acidic)
• Orange juice (pH 3.5-4.5, strongly acidic)

Explanation

• Milk has a pH level of around 6.5-7, which is slightly acidic to neutral. 
• This is because milk contains lactic acid and other acidic compounds.

Explanation

The pH scale ranges from 1 to 14, with:

• 1-6 being acidic
• 7 being neutral (neither acidic nor basic)
• 8-14 being basic (alkaline)

Explanation

• Litmus paper is a simple and effective way to test whether a substance is an acid or a base.
• It turns red in acidic solutions and blue in basic solutions.

Explanation

• Ascorbic acid, also known as Vitamin C, is found in various fruits and vegetables.
• But Alma (Emblica officinalis) and citrus fruits like oranges, lemons, and grapefruits are particularly rich in it.

Explanation

• Lactic acid is a natural preservative found in fermented foods like yogurt, cheese, and sauerkraut.
• It's produced during the fermentation process when bacteria like Lactobacillus convert sugars into acid.