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Acids, Bases and Salts

The acid used for preserving food articles is

a) Acetic acid.
b) Tartaric acid.
c) Sulphuric acid.
d) Nitric acid.

✔Answer

✔Solution

Correct Answer Is : Acetic acid.

Solution Is : Acetic acid is present in vinegar and it is used in preserving food items like jams, jelly, sauces, etc.

Ascorbic acid is commonly known as

a) Vitamin D.
b) Vitamin C.
c) Vitamin A.
d) Vitamin K.

✔Answer

✔Solution

Correct Answer Is : Vitamin C.

Solution Is : Ascorbic acid is vitamin C and is found in citrus fruits like oranges, lemons, etc.

A strong base is

a) Ammonium hydroxide.
b) Sodium hydroxide.
c) Water.
d) Sulphuric acid.

✔Answer

✔Solution

Correct Answer Is : Sodium hydroxide.

Solution Is : Sodium hydroxide is a strong base because it completely ionises in water, while ammonium hydroxide is a weak base. Water is neutral in nature, neither acidic nor basic.

When phenolphthalein is introduced in lime water, the solution turns

a) Blue.
b) Black.
c) Brown.
d) Pink.

✔Answer

✔Solution

Correct Answer Is : Pink.

Solution Is : Phenolphthalein turns colorless in acidic solutions and pink in basic solutions(Lime water).

Litmus solution is obtained from

a) Mango plant.
b) Lichi
c) Lemon plant.
d) Lichens.

✔Answer

✔Solution

Correct Answer Is : Lichens.

Solution Is : The most commonly used natural indicator is litmus. It is extracted from lichens.

Acids and bases tastes respectively as

a) Sweet, salty.
b) Sweet, sweet.
c) Salty, salty.
d) Sour, bitter.

✔Answer

✔Solution

Correct Answer Is : Sour, bitter.

Solution Is : All acids are sour in taste, like tartaric acid in tamarind and acetic acid in vinegar while all bases are bitter in taste like baking soda.

Water soluble bases are

a) Salt.
b) Alkali.
c) Amphoteric.
d) Neutral compounds.

✔Answer

✔Solution

Correct Answer Is : Alkali.

Solution Is : Water soluble bases are called alkalis.Bases are also the oxides or hydroxides of metals. A soluble base is also often referred to as an alkali if OH? ions are involved.

The compound that is added to the basic soil is

a) Quick lime.
b) Carbon dioxide.
c) Organic matter.
d) Calcium hydroxide.

✔Answer

✔Solution

Correct Answer Is : Organic matter.

Solution Is : Excessive use of chemical fertilisers makes the soil acidic. Plants do not grow well when the soil is too acidic or too basic. When the soil is too acidic, it is treated with bases like quick lime (calcium oxide) or slaked lime (calcium hydroxide). If the soil is basic, organic matter is added to it. Organic matter releases acids which neutralises the basic nature of the soil.

The factory wastes are neutralised by adding

a) Acid.
b) Base.
c) Sodium chloride.
d) Chlorine.

✔Answer

✔Solution

Correct Answer Is : Base.

Solution Is : Wastes of many factories contain acids. If they are allowed to flow into the water bodies, the acids will kill fish and other organisms. Therefore, factory wastes are neutralised by adding basic substances.

The chemical used in the manufacture of medicine is

a) Calcium
b) Hydrochloric acid.
c) Caustic
d) Phosphoric

✔Answer

✔Solution

Correct Answer Is : Caustic

Solution Is : Many acidic?and basic substances are used for several purposes, like caustic soda is used in medicine, phosphoric acid is used in the manufacture of phosphatic fertilizers, calcium hydroxide is used in manufacture of bleaching powder and hydrochloric acid is used in dyeing industry.

❑Acids, Bases and Salts
❑Nutrition in Animals
❑Motion and Time
❑Light
❑Heat
❑Forests- Our Lifeline
❑Fibre to Fabric
❑Weather Climate and Adaptations of Animals to Climate
❑Water A Precious Resource
❑Waste Water Story
❑Transportation in Animals and Plants
❑Soil
❑Reproduction in Plants
❑Electric Current And Its Effects
❑Respiration in Organisms
❑Nutrients in Plants
❑Physical and Chemical Changes

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Class 7 Science Study Material

Acids, Bases and Salts

The acid used for preserving food articles is

Correct Answer Is : Acetic acid.

Solution Is : Acetic acid is present in vinegar and it is used in preserving food items like jams, jelly, sauces, etc.

Ascorbic acid is commonly known as

Correct Answer Is : Vitamin C.

Solution Is : Ascorbic acid is vitamin C and is found in citrus fruits like oranges, lemons, etc.

A strong base is

Correct Answer Is : Sodium hydroxide.

Solution Is : Sodium hydroxide is a strong base because it completely ionises in water, while ammonium hydroxide is a weak base. Water is neutral in nature, neither acidic nor basic.

When phenolphthalein is introduced in lime water, the solution turns

Correct Answer Is : Pink.

Solution Is : Phenolphthalein turns colorless in acidic solutions and pink in basic solutions(Lime water).

Litmus solution is obtained from

Correct Answer Is : Lichens.

Solution Is : The most commonly used natural indicator is litmus. It is extracted from lichens.

Acids and bases tastes respectively as

Correct Answer Is : Sour, bitter.

Solution Is : All acids are sour in taste, like tartaric acid in tamarind and acetic acid in vinegar while all bases are bitter in taste like baking soda.

Water soluble bases are

Correct Answer Is : Alkali.

Solution Is : Water soluble bases are called alkalis.Bases are also the oxides or hydroxides of metals. A soluble base is also often referred to as an alkali if OH? ions are involved.

The compound that is added to the basic soil is

Correct Answer Is : Organic matter.

The factory wastes are neutralised by adding

Correct Answer Is : Base.

Solution Is : Wastes of many factories contain acids. If they are allowed to flow into the water bodies, the acids will kill fish and other organisms. Therefore, factory wastes are neutralised by adding basic substances.

The chemical used in the manufacture of medicine is

Correct Answer Is : Caustic

Solution Is : Many acidic?and basic substances are used for several purposes, like caustic soda is used in medicine, phosphoric acid is used in the manufacture of phosphatic fertilizers, calcium hydroxide is used in manufacture of bleaching powder and hydrochloric acid is used in dyeing industry.

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