7th Grade > Chemistry
ACIDS BASES AND SALTS MCQs
Total Questions : 116
| Page 1 of 12 pages
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Salt definition, nature of salt, example: 3 Marks
Names: 1 Mark each
Salts are the ionic compounds generally formed as a result of neutralization of an acid with a base. They can be acidic, basic or neutral.
Examples:
Acidic salts: Sodium bicarbonate (NaHCO3)
Basic salts: Magnesium chloride (MgCl2)
Neutral salts: Sodium chloride (NaCl)
b). i) Acetic Acid ii) Lactic Acid
Answer: Option D. -> lichens
:
D
Litmusis a purple coloured solution of different dyes which are naturally obtained from lichens. The litmus paper is used as a visual indicator to distinguish between acidic and basic solutions. The colour of litmus paper turns red in an acidic solution and bluein a basic solution.
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D
Litmusis a purple coloured solution of different dyes which are naturally obtained from lichens. The litmus paper is used as a visual indicator to distinguish between acidic and basic solutions. The colour of litmus paper turns red in an acidic solution and bluein a basic solution.
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Soil Treatment: 2 Marks
Too acidic: 1.5 Marks
Too basic: 1.5 Marks
With the increase in demand of crops, farmers have started using excessive fertilizers which is affecting the acid-base balance in the soil.Plants do not grow well when the soil is either too acidic or too basic. This process of restoring the acid-base balance in the soil is called soil treatment.
When the soil is too acidic, it is treated with bases like quicklime (calcium oxide) or slaked lime.
If the soil is too basic, organic matter is added to it, which neutralizes the basic nature of the soil by releasing acids.
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Examples: 0.5 Mark each
Acids:
1. Hydrochloric acid
2. Sulphuric acid
3. Nitric acid
Bases:
1. Sodium hydroxide
2. Ammonium hydroxide
3. Copper oxide
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Each blank: 1 Mark
i) No effect
ii) Bitter
iii) Turns to pinkish color.
The final table will look like this:
PropertiesAcidBaseRedLitmus(i)NoeffectTurnstoblueTasteSour(ii)BitterExtractofredcabbage(iii)TurnstopinkishcolourTurnstogreenishcolor
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Each part: 1 Mark
i) Hydrogen gas is released when an acid reacts with metals.
ii) Itching of the skin is due to corrosive nature of acid.
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Each point: 1 Mark
1. Sulphuric acid is used in batteries and fire extinguishers.
2. Acetic acid is used in pickles.
3. Acids are used in explosives. Eg: Nitric acid, Picric acid.
Answer: Option B. -> Reduces the cleaning action
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B
Ammonia is the common ingredient in most household cleaners. A solution of ammonium hydroxide (base) is used to clean various surfaces. If vinegar (acetic acid) is added instead of water it would neutralise the ammonia solution and reduce the cleaning action.
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B
Ammonia is the common ingredient in most household cleaners. A solution of ammonium hydroxide (base) is used to clean various surfaces. If vinegar (acetic acid) is added instead of water it would neutralise the ammonia solution and reduce the cleaning action.
Answer: Option A. -> True
:
A
The process of neutralization involves the reaction of an acid and a base to form salt and water. e.g. Whenhydrochloric acid reacts with sodium hydroxide, it leads to the formation of sodium chloride (salt) and water.
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A
The process of neutralization involves the reaction of an acid and a base to form salt and water. e.g. Whenhydrochloric acid reacts with sodium hydroxide, it leads to the formation of sodium chloride (salt) and water.
Answer: Option B. -> Base
:
B
When an ant bites, it injectsformic acid in our body, so we should use a base such as sodium bicarbonate. It will neutralize the effect of the acid.
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B
When an ant bites, it injectsformic acid in our body, so we should use a base such as sodium bicarbonate. It will neutralize the effect of the acid.
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