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  • Class 7 Science Study Material

An Educational platform for Preparation and Practice Class 7. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 7. This study material help Class 7, Science students in learning every aspect of Acids, Bases and Salts . Students can understand Acids, Bases and Salts concept easily and consolidate their learning by doing Online Practice Tests on Science ,Acids, Bases and Salts chapter repeatedly till they excel in Class 7, Acids, Bases and Salts . Free ONLINE PRACTICE TESTS on Class 7, Acids, Bases and Salts comprise of Hundreds of Questions on Acids, Bases and Salts , prepared by the highly professionals team. Every repeat test of Acids, Bases and Salts will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Acids, Bases and Salts . Attempt ONLINE TEST on Class 7,Science ,Acids, Bases and Salts in Academics section after completing this Acids, Bases and Salts Question Answer Exercise.


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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.
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