Download App

Exploring Substances: Acidic, Basic, and Neutral — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceExploring Substances: Acidic, Basic, and Neutral5 Marks
Question
Explain the neutralisation reaction using lemon juice and lime water.
✓

Answer

→ Neutralization is a chemical reaction between an acid and a base, resulting in the formation of salt and water.
 → Lemon juice contains citric acid (an acid), and lime water contains calcium hydroxide (a base). When these two are mixed in the right proportions, they neutralize each other. Initially, the lemon juice is acidic.
→ If we add an indicator like litmus, it will turn red. As lime water is gradually added, the acidic properties of the lemon juice are countered by the basic properties of the lime water.
→ At the point of neutralization, the solution is neither acidic nor basic; it becomes neutral, and the litmus paper will show a neutral color (for litmus, it would be purplish).
 → This reaction produces a salt (calcium citrate) and water, along with heat, illustrating how an acid and a base can cancel out each other's effects to form a neutral substance.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Exploring Substances: Acidic, Basic, and Neutral→Exploring Substances: Acidic, Basic, and Neutral — all question types→Science STD 7 question papers→Gujarat Board STD 7 question papers→Gujarat Board question paper generator→

Similar questions

Match the Columns $I$ with Column $II.$
S.No.
Column 1
  
Column II
$(a)$
Real image
$(i)$
Cannot be formed on the screen.
$(b)$
Magnified image
$(ii)$
Upside down image.
$(c)$
Erect image
$(iii)$
Smaller than the object.
$(d)$
Diminished image
$(iv)$
Upright image.
$(e)$
Virtual image
$(v)$
Bigger than the object.
$(f)$
Inverted image
$(vi)$
Formed on the screen.
→
Fill in the blanks in the following statements using the words given in the box.
rusted, colourful, substance, chemical, physical, reversible, iron oxide, object
  1. Making sugar solution is a ____________ change.
  2. A physical change is generally____________.
  3. Grinding of wheat grain changes its size. It is a ____________ change.
  4. Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
→
Draw a labelled diagram of a simple electric circuit.
→
Match the substances in Column I with those in Column II.
 
Column I
 
Column II
$(a)$
Tartaric acid
$(i)$
soap
$(b)$
Calcium hydroxide
$(ii)$
curd
$(c)$
Formic acid
$(iii)$
unripe mangoes
$(d)$
Sodium hydroxide
$(iv)$
ant's sting
$(e)$
Lactic acid
$(v)$
lime water
→
Classify the following as motion along a straight line, circular or oscillatory motion.
  • Motion of our hands while running.
  • Motion of a horse pulling a cart on a straight road.
  • Motion of a kid in a merry-go-round.
  • Motion of a child on a see-saw.
  • Motion of the hammer of an electric bell.
  • Motion of a train on a straight bridge.
→
Differentiate between a convex and a concave lens.
→
The mountaineers carry oxygen with them because:
  1. At an altitude of more than $5\ km$ there is no air.
  2. The amount of air available to a person is less than that available on the ground.
  3. The temperature of air is higher than that on the ground.
  4. The pressure of air is higher than that on the ground.
→
Explain why forest is called "the dynamic living entity"?
→
Name some fruit bearing plants. Now make a table and describe the method of seed dispersal in these fruits as well as the part which helps in the seed dispersal.
→
Differentiate between clayey soil and sandy soil.
→