Jab Acid Base se Mile
Class 7 Science · Chapter 2: Padaarthon ki Khoj: Acidic, Basic aur Neutral · NCERT Curiosity section 2.2
Seekho
Ishaan test tube mein thode paani ke saath neembu ras ki boond daalkar neele litmus ghol ki boond milaata hai: ye laal ho jaata hai (acidic). Phir wo choone ka paani boond-boond, har baar hilaate hue, daalta hai.
Ek samay rang laal se neela ho jaata hai: ghol ab acidic nahi raha. Choone ke paani ne acid ko neutralise kar diya. Neembu ras ki ek aur boond daalo to phir laal ho jaata hai.
Jab acid aur base sahi maatra mein mile, to nateeja na acidic na basic. Ye neutralisation kriya hai. Isse salt (lavan) aur paani banta hai, aur garmi nikalti hai: test tube thoda garam lagta hai.
Acid + Base → Salt + Water + Heat
Yahan "salt" ka matlab kriya mein bana naya padaarth hai, sirf khaane ka namak nahi. Neutralisation ghar aur prakriti ki kai paheliyan samjhaata hai, jaise aage dekhenge.
Explore: neutralisation prayog.
- Steps kram mein lagao.
Yaad rakho
- Acid aur base ek doosre ko neutralise karte hain.
- Neutralisation se salt aur paani bante hain aur garmi nikalti hai.
Quick check
Acid base ko neutralise kare to kya banta hai?
- salt aur paani, garmi ke saath
- sirf gas
- aur acid
- kuch nahi
Answer
salt aur paani, garmi ke saath. Acid + base → salt + paani + garmi.
Socho
Angoor ke ras aur gulaab ark ke mishran mein laal jhalak hai. Dheere-dheere baking soda daalne par kya hoga?
Ek answer
Angoor ke ras ka acid neutralise hota hai; laal jhalak mitti hai, aur zyaada baking soda se mishran hara (basic) ho jaata hai.
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.