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Acids, Bases and Salts

The reaction of acids with a base to form salt and water is termed as

a) Oxidation.
b) Reduction.
c) Neutralization.
d) Crystallisation.

✔Answer

✔Solution

Correct Answer Is : Neutralization.

Solution Is : When the metal from the base displaces hydrogen from the acid, then it combines to form salt and water. In this way, the base neutralizes the acid and destroys its acidity.

Grapes contain

a) Tartaric Acid.
b) Acetic Acid.
c) Citric Acid.
d) Lactic Acid.

✔Answer

✔Solution

Correct Answer Is : Tartaric Acid.

Solution Is : Grape contains tartaric acid, vinegar contains acetic acid, lemon has citric acid and sour milk has lactic acid.

The salt and water products are formed in

a) Neutralization reaction.
b) Addition reaction.
c) Substitution reaction.
d) Oxidation reaction.

✔Answer

✔Solution

Correct Answer Is : Neutralization reaction.

Solution Is : In neutralization reaction acid and base react to form salt and water.

The colour of litmus

a) Acidic solution is added to it.
b) Basic solution is added to it.
c) Neutral solution is added to it.
d) Alkaline solution is added to it.

✔Answer

✔Solution

Correct Answer Is : Neutral solution is added to it.

Solution Is : No change in?colour is observed when litmus solution is added to neutral solution. But acidic and basic solutions do change the colours of the litmus paper.

When an acid and a base react, the temperature of reaction mixture

a) Increses.
b) Decreases.
c) Remains same.
d) First increases then decreases

✔Answer

✔Solution

Correct Answer Is : Increses.

Solution Is : In neutralisation reaction, heat is always evolved. The evolved heat raises the temperature of the reaction mixture.

Acid present in the sting of an ant is

a) Acetic acid.
b) Formic acid.
c) Lactic acid.
d) Ascorbic acid.

✔Answer

✔Solution

Correct Answer Is : Formic acid.

Solution Is : The sting of an ant contains formic acid. Its effect can be neutralized by rubbing moist baking soda on the affected part.

In acidic solution china rose indicator turns

a) Green.
b) Black.
c) Magenta.
d) Blue.

✔Answer

✔Solution

Correct Answer Is : Magenta.

Solution Is : Special type of substances are used to test whether a substance is acidic or?basic. These substances are known as?indicators. ?China rose indicator?turns to magenta colour?in acidic solution and green colour in basic solution.

The acid present in our stomach which helps in digestion of food is

a) Sulphuric acid.
b) Nitric acid.
c) Hydrochloric acid.
d) Phosphoric acid.

✔Answer

✔Solution

Correct Answer Is : Hydrochloric acid.

Solution Is : Hydrochloric acid is naturally present in our stomach and helps in digestion. The production of hydrochloric acid is controlled because excess of hydrochloic acid leads to acidity.

The acidic soil is not good for healthy growth of plants. This type of soil

a) Ammonium chloride (NH4Cl) to the soil.
b) Calcium oxide (CaO) to the soil.
c) Sodium chloride
d) Organic matter to the soil.

✔Answer

✔Solution

Correct Answer Is : Calcium oxide (CaO) to the soil.

Solution Is : This soil is neutralized by adding calcium oxide (CaO), which is basic in nature.

When the solution is basic, phenolphthalein gives

a) Blue colour.
b) Red colour.
c) Pink colour.
d) Orange colour.

✔Answer

✔Solution

Correct Answer Is : Pink colour.

Solution Is : When the solution is basic, phenolphthalein gives a pink colour and when the solution is acidic it remains colourless.

❑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 reaction of acids with a base to form salt and water is termed as

Correct Answer Is : Neutralization.

Solution Is : When the metal from the base displaces hydrogen from the acid, then it combines to form salt and water. In this way, the base neutralizes the acid and destroys its acidity.

Grapes contain

Correct Answer Is : Tartaric Acid.

Solution Is : Grape contains tartaric acid, vinegar contains acetic acid, lemon has citric acid and sour milk has lactic acid.

The salt and water products are formed in

Correct Answer Is : Neutralization reaction.

Solution Is : In neutralization reaction acid and base react to form salt and water.

The colour of litmus

Correct Answer Is : Neutral solution is added to it.

Solution Is : No change in?colour is observed when litmus solution is added to neutral solution. But acidic and basic solutions do change the colours of the litmus paper.

When an acid and a base react, the temperature of reaction mixture

Correct Answer Is : Increses.

Solution Is : In neutralisation reaction, heat is always evolved. The evolved heat raises the temperature of the reaction mixture.

Acid present in the sting of an ant is

Correct Answer Is : Formic acid.

Solution Is : The sting of an ant contains formic acid. Its effect can be neutralized by rubbing moist baking soda on the affected part.

In acidic solution china rose indicator turns

Correct Answer Is : Magenta.

Solution Is : Special type of substances are used to test whether a substance is acidic or?basic. These substances are known as?indicators. ?China rose indicator?turns to magenta colour?in acidic solution and green colour in basic solution.

The acid present in our stomach which helps in digestion of food is

Correct Answer Is : Hydrochloric acid.

Solution Is : Hydrochloric acid is naturally present in our stomach and helps in digestion. The production of hydrochloric acid is controlled because excess of hydrochloic acid leads to acidity.

The acidic soil is not good for healthy growth of plants. This type of soil

Correct Answer Is : Calcium oxide (CaO) to the soil.

Solution Is : This soil is neutralized by adding calcium oxide (CaO), which is basic in nature.

When the solution is basic, phenolphthalein gives

Correct Answer Is : Pink colour.

Solution Is : When the solution is basic, phenolphthalein gives a pink colour and when the solution is acidic it remains colourless.

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