Solution Kya Hai? (Solute, Solvent aur Solution)
ORS ke har ghoont ka swaad ek jaisa kyun hota hai? 🥤
🧭 Is Post Mein
📖 Kahani: Golu ka ORS aur Nani ki Chashni
Garmi ki dopahar thi. Golu cricket khel kar aaya toh thaka hua tha. Mummy ne usse ek glass ORS ka ghol pila diya. Golu ne pehla ghoont liya, phir beech ka, phir aakhri. “Arre, har ghoont ka swaad bilkul ek jaisa hai!”
Uska dost Rohan shaitani se bola: “Isme kya hai, main bhi aisa bana deta hoon.” Usne ek glass paani mein chalk ka powder daal kar hilaya. Paani safed hua, lekin 10 minute baad saara chalk neeche baith gaya aur upar ka paani lagbhag saaf ho gaya.
Udhar rasoi mein Priya ki Nani gulab jamun ki chashni bana rahi thi: ek katori paani mein do katori cheeni! Priya ne poocha: “Nani, isme toh cheeni zyada hai, paani kam. Toh kaun kis mein ghula hai?”
Teen sawaal, ek hi chapter: ORS mein sab barabar kyun mila hai? Chalk kyun neeche baith gaya? Aur chashni mein “ghulne wala” kaun hai? Chaliye, aaj jawab dhoondhte hain. 🔍
🎯 Is Post Mein Kya Seekhenge
- Uniform aur non-uniform mixture mein fark (ORS vs chalk wala paani)
- Solution, solute aur solvent kise kehte hain
- Kisi bhi ghol mein solute aur solvent kaise pehchaanein, chashni wali paheli ke saath
- Cheeni paani mein ghulti hai, tel mein kyun nahi
- Ghar pe ek mazedaar “ghulega ya nahi” experiment
🧱 Basics: Pehle Yeh Aana Chahiye
1. Mixture: do ya zyada cheezon ka mel, jisme koi nayi cheez nahi banti aur har cheez apne gun rakhti hai. (Chapter 8 mein padha tha.)
2. Matter chhote kanon (particles) se bana hai, aur in kanon ke beech thodi khaali jagah hoti hai. (Chapter 7 ka idea.)
3. Uniform mixture mein hisse har jagah ek jaise mile hote hain, non-uniform mein nahi.
💡 Concept: Solution Kya Hai?
Step 1: Do tarah ke mixture. Jab hum paani mein kuch milate hain, toh do mein se ek baat hoti hai:
(b) Cheez nahi ghulti: jaise chalk, reth (sand) ya burada (sawdust). Kan alag dikhte hain, kuch neeche baith jaate hain ya upar tairte hain. Yeh non-uniform mixture hai.
Step 2: Solution ki paribhasha. Do ya do se zyada cheezon ke uniform mixture ko solution (ghol) kehte hain. ORS, namak-paani, cheeni-paani, chashni, sab solutions hain.
Step 3: Solution ke do hisse.
Solvent (gholne wala): jis mein cheez ghulti hai. Jaise paani.
Solute + Solvent = Solution
Kyun? Cheeni ke kan paani ke kanon ke beech ki khaali jagah mein bikhar jaate hain. Woh itne chhote ho jaate hain ki aankh se nahi dikhte, aur poore paani mein barabar fail jaate hain. Isiliye har ghoont ka swaad ek jaisa hota hai.
Step 4: Solute aur solvent kaise pehchaanein? (Do pakke niyam)
Kyun? Liquid hi woh hai jo apne andar solid ko jagah deta hai aur ghol ka roop (liquid) tay karta hai. Chashni bhi liquid hi hai, isliye paani solvent hai.
Jaise 10 mL glycerine + 90 mL paani: glycerine solute, paani solvent.
Step 5: Paani ek bahut achha solvent hai. Cheeni, namak, phitkari, ORS powder, bahut saari cheezein paani mein ghul jaati hain. Lekin har cheez nahi: cheeni aur namak tel mein nahi ghulte. Yaani har solvent har cheez nahi gholta.
Ek line mein: Solution = uniform mixture; jo ghule woh solute, jis mein ghule woh solvent.
🖼️ Diagrams: Picture se Samjho
🔐 Deep Concept: Chashni ki Paheli aur Tel ka Inkaar
Paheli 1: Chashni mein solvent kaun? Nani ne 1 katori paani mein 2 katori cheeni ghol di. Matra mein cheeni zyada hai, phir bhi solvent paani hi hai. Kyun? Kyunki cheeni (solid) paani (liquid) ke andar ghul kar uske kanon ke beech fail gayi hai, aur poora ghol liquid jaisa behta hai. “Zyada matra wala solvent” ka niyam sirf liquid + liquid ke liye hai.
Paheli 2: Cheeni tel mein kyun nahi ghulti? Paani ke kan cheeni aur namak ke kanon ko apni taraf kheench kar unhe alag-alag kar dete hain aur gher lete hain. Tel ke kan aisa kheenchaav nahi lagate, isliye cheeni ke daane tel mein jaise ke taise pade rehte hain. Isiliye kehte hain: solvent aur solute ki “dosti” honi chahiye. Paani bahut saari cheezon ka dost hai, isliye use ek bahut achha solvent maana jaata hai, lekin har cheez ka nahi.
✏️ Examples: Solution hai ya nahi? Solute-solvent kaun?
Solute: cheeni (glucose), namak aur doosre lavan. Solvent: paani. Har ghoont ek jaisa.
Solute: cheeni. Solvent: paani (cheeni zyada hone ke bawajood, kyunki yeh solid + liquid hai).
Solute: carbon dioxide gas. Solvent: paani. Bottle kholte hi bulbule isi ghuli gas ke hain.
Solute: namak aur kai lavan. Solvent: paani. (Upar tairta kachra iska hissa nahi, woh alag hai.)
Kan ghulte nahi, neeche baith jaate hain. Yeh non-uniform mixture hai.
Nitrogen sabse zyada hai, isliye ise solvent maan sakte hain. Oxygen, argon, CO₂ jaisi gases isme barabar mili hain.
⚖️ Difference Table: Solution vs Non-uniform Mixture
| Baat | Solution (jaise namak-paani) | Non-uniform mixture (jaise chalk-paani) |
|---|---|---|
| Dikhna | Har jagah ek jaisa, aksar saaf | Kan alag dikhte hain, dhundhla |
| Rakhne pe | Kuch neeche nahi baithta | Kan neeche baith jaate hain ya tairte hain |
| Filter paper / kapde se chhaanna | Solute bhi nikal jaata hai, kuch nahi rukta | Kan kagaz pe ruk jaate hain |
| Swaad / gun | Upar, beech, neeche sab jagah same | Alag-alag hisson mein alag |
| Example | ORS, chashni, soda water | Chalk, reth ya burada wala paani |
🚫 Misconceptions: Log aisa sochte hain… lekin
❌ “Cheeni ghul kar khatam ho gayi.”
✅ Sach: cheeni ke kan bas bahut chhote ho kar paani mein bikhar gaye. Swaad meetha hai, yani cheeni andar hai.
❌ “Solvent hamesha woh hota hai jo zyada matra mein ho.”
✅ Sach: yeh sirf liquid + liquid ke liye sahi hai. Chashni mein cheeni zyada hai, phir bhi paani solvent hai.
❌ “Solvent sirf paani hi hota hai.”
✅ Sach: paani sabse aam solvent hai, par aur bhi hain. Jaise hawa (gas solution) mein nitrogen solvent jaisa kaam karti hai.
❌ “Zor se hilaane se chalk bhi ghul jaayega.”
✅ Sach: hilaane se chalk bas kuch der tairta hai, ghulta nahi. Rakhte hi neeche baith jaata hai.
❌ “Har saaf dikhne wala paani shuddh (pure) hota hai.”
✅ Sach: namak ka ghol bhi saaf dikhta hai, par usme namak ghula hai. Saaf hona shuddh hone ka saboot nahi.
🔤 Key Terms (Exam mein English shabd hi likhna)
❓ FAQs
1. Kya har solution saaf (transparent) hota hai?
Zyaadatar solutions aar-paar dikhte hain, lekin rangeen bhi ho sakte hain, jaise neela thotha (copper sulphate) ka neela ghol ya chai ka ghol. Pehchaan “saaf” hona nahi, balki har jagah ek jaisa hona aur kanon ka neeche na baithna hai.
2. Kya solution mein solute ek se zyada ho sakte hain?
Haan. ORS mein cheeni (glucose) bhi hai aur namak bhi, dono solute hain. Solvent ek hi hai: paani. Nimbu pani mein bhi cheeni, namak aur nimbu ka ras, sab ghule hain.
3. Solution ko chhaan kar solute alag kyun nahi hota?
Kyunki ghule hue solute ke kan itne chhote hote hain ki filter paper ya kapde ke chhedon se paani ke saath nikal jaate hain. Solute alag karna ho toh paani ko uda (evaporate) do, solute bach jaayega.
4. Chashni mein paani solvent kaise, jab cheeni zyada hai?
Niyam: solid + liquid mein liquid hi solvent hota hai. Cheeni solid hai, paani liquid. Cheeni paani mein ghul kar bikhri hai, ulta nahi. Isliye matra chahe jo ho, paani solvent hai.
5. Ghar pe kaun-kaun se solvents milte hain?
Paani sabse aam hai. Iske alawa sarson ka tel (achaar mein masalon ka swaad apne andar le leta hai) aur nail polish remover (nail polish ko gholta hai) bhi solvents ki tarah kaam karte hain. Remover ko sirf bade log hi istemaal karein.
🧪 Activity (NCERT): Kaun ghulta hai, kaun nahi?
Saamaan: 5 saaf glass, paani, 5 chammach, aur yeh 5 cheezein: cheeni, namak, chalk ka powder, reth (sand), lakdi ka burada (sawdust).
Kya dikhega: cheeni aur namak ghul jaate hain aur ghol saaf, ek jaisa rehta hai. Chalk paani ko dhundhla karta hai aur dheere-dheere neeche jam jaata hai. Reth turant neeche baith jaati hai. Burada zyaadatar upar tairta hai.
Nishkarsh: sirf cheeni aur namak wale glass mein solution bana. Baaki teen non-uniform mixtures hain, kyunki unke kan ghule nahi.
Yeh activity NCERT ki Class 8 Science book Curiosity (Chapter 9) par aadharit hai, aur yahan apne shabdon mein samjhayi gayi hai.
🏠 Mini Experiments (Ghar pe)
Isse kya pata chala? Har solvent har cheez ko nahi gholta. Cheeni ka “dost” paani hai, tel nahi.
Ek glass namak ka ghol aur ek glass chalk wala paani lo. Dono ko alag-alag saaf patle kapde se chhaano. Chalk kapde pe ruk jaayega, lekin namak wala paani poora nikal jaayega aur kapde pe kuch nahi bachega. Ghule hue kan filter se bhi chhote hote hain!
Ek glass paani mein ek chammach cheeni achhe se ghol lo. Ek saaf straw se upar ka thoda paani chakho, phir glass ke neeche tak straw daal kar chakho. Swaad same milega, kyunki solution uniform hota hai.
🧠 Think Like a Scientist
Sawaal: Rohan kehta hai, “Namak paani mein ghul ke khatam ho jaata hai.” Ek scientist ki tarah ise kaise check karoge?
Scientist ka tareeka dekho
1. Observe (dekho): namak daalne ke baad paani mein kuch nahi dikhta.
2. Guess (anumaan): shayad namak khatam nahi hua, bas chhote kanon mein bikhar gaya.
3. Test (jaanch): (a) paani ko chakh lo, khaara lagega. (b) Thoda ghol ek plate mein dhoop mein rakh do. (c) Kitchen scale ho toh: 200 g paani + 10 g namak ghol kar vajan karo.
4. Result: paani khaara hai, plate pe safed namak ki parat bachti hai, aur ghol ka vajan 210 g aata hai.
5. Conclusion: namak khatam nahi hua, bas ghul gaya. Ghulne mein vajan (mass) nahi ghatta: solution ka mass = solute + solvent. 🔬
🌍 Real Life Mein Solutions
- 🥤 ORS: dast ya loo lagne pe shareer mein paani aur lavan ki kami poori karta hai. Packet pe likhi vidhi ya doctor ki salaah se hi banayein.
- 🍮 Chashni: gulab jamun, jalebi aur rasgulle ki mithaas isi cheeni ke ghol se aati hai.
- 🫧 Soda aur cold drink: dabaav se paani mein CO₂ gas gholi jaati hai, isliye bulbule aate hain.
- 🌊 Samudra ka paani: namak ka ghol hai. Isse dhoop mein sukha kar namak banaya jaata hai.
- 💊 Dawai ke syrup: dawa ko paani ya meethe ghol mein gholte hain, taaki har chammach mein barabar dawa ho. Isi liye har dose ek jaisi hoti hai.
🔁 Recap: Poora Post Ek Nazar Mein
- Uniform mixture: har jagah ek jaisa (ORS, namak-paani). Non-uniform: kan alag dikhte, neeche baithte (chalk, reth, burada wala paani).
- Solution = do ya zyada cheezon ka uniform mixture.
- Solute = jo ghule; Solvent = jis mein ghule; Solute + Solvent = Solution.
- Solid + liquid: liquid hamesha solvent (chashni mein bhi paani). Liquid + liquid: kam matra wala solute.
- Gas bhi solute ho sakti hai: soda water mein CO₂.
- Paani ek bahut achha solvent hai, par cheeni-namak tel mein nahi ghulte.
- Ghule solute ko chhaan kar alag nahi kar sakte; paani uda kar alag karte hain. Ghulne mein mass nahi ghatta.
✍️ Fill in the Blanks
- Do ya zyada cheezon ke uniform mixture ko ______ kehte hain.
- Jo cheez ghulti hai, use ______ kehte hain.
- Jis cheez mein koi doosri cheez ghulti hai, use ______ kehte hain.
- Gulab jamun ki chashni mein solvent ______ hai.
- Soda water mein ghuli gas ______ hai.
- Chalk aur paani ka mixture ______ mixture hai.
Answers
1) solution · 2) solute · 3) solvent · 4) paani · 5) carbon dioxide · 6) non-uniform
✅ True / False
- Solution ek uniform mixture hai.
- Solvent hamesha woh hota hai jiski matra zyada ho.
- Reth aur paani milkar solution banate hain.
- Paani mein ghuli cheeni ko kapde se chhaan kar alag kar sakte hain.
- Soda water mein carbon dioxide solute hai.
- Cheeni khaane ke tel mein aasani se ghul jaati hai.
Answers (kyun ke saath)
1) True: solution mein hisse har jagah barabar mile hote hain.
2) False: yeh sirf liquid + liquid mein sahi hai; chashni mein cheeni zyada hai phir bhi paani solvent hai.
3) False: reth ghulti nahi, neeche baith jaati hai; yeh non-uniform mixture hai.
4) False: ghule kan kapde ke chhedon se nikal jaate hain; paani uda kar cheeni milti hai.
5) True: gas (CO₂) paani (solvent) mein ghuli hai.
6) False: cheeni paani mein ghulti hai, tel mein nahi.
🔘 MCQs
Q1. Solution kaisa mixture hota hai? (a) Non-uniform (b) Uniform (c) Hamesha rangeen (d) Jisme kan neeche baith jaate hain
✅ (b) Uniform: solution mein solute har jagah barabar faila hota hai.
(a) non-uniform mixture solution nahi hota.
(c) solution saaf ya rangeen dono ho sakta hai.
(d) solution mein kan neeche nahi baithte.
Q2. Namak ke ghol mein solvent kaun hai? (a) Namak (b) Paani (c) Dono (d) Koi nahi
✅ (b) Paani: namak paani mein ghulta hai.
(a) namak solute hai.
(c) dono ek saath solvent nahi ho sakte; ek ghulta hai, ek gholta hai.
(d) har solution mein ek solvent hota hai.
Q3. Chashni mein cheeni ki matra paani se zyada hai. Solvent kaun hai? (a) Cheeni (b) Paani (c) Dono (d) Jo zyada ho woh
✅ (b) Paani: solid + liquid mein liquid hi solvent hota hai.
(a) cheeni solid hai, isliye solute.
(c) dono solvent nahi ho sakte.
(d) “zyada matra” wala niyam sirf liquid + liquid ke liye hai.
Q4. Inme se solution kaunsa hai? (a) Chalk wala paani (b) Reth wala paani (c) ORS ka ghol (d) Burada wala paani
✅ (c) ORS: cheeni aur namak poori tarah ghul kar uniform ghol banate hain.
(a) chalk neeche jam jaata hai.
(b) reth turant neeche baith jaati hai.
(d) burada tairta hai, ghulta nahi.
Q5. Soda water ke bulbule kis gas ke hain? (a) Oxygen (b) Nitrogen (c) Carbon dioxide (d) Hydrogen
✅ (c) Carbon dioxide: yahi gas dabaav se paani mein gholi jaati hai.
(a), (b), (d) soda water mein bulbule ke liye nahi gholi jaati.
Q6. Namak ke ghol ko filter paper se chhaanne par kya hoga? (a) Namak kagaz pe ruk jaayega (b) Poora ghol nikal jaayega, kagaz pe kuch nahi rukega (c) Paani kagaz pe ruk jaayega (d) Ghol jam jaayega
✅ (b): ghule namak ke kan kagaz ke chhedon se bhi chhote hain.
(a) aisa sirf na ghulne wali cheezon ke saath hota hai.
(c) paani hamesha kagaz se nikal jaata hai.
(d) chhaanne se ghol nahi jamta.
Q7. Cheeni inme se kis mein NAHI ghulti? (a) Thanda paani (b) Garam paani (c) Khaane ka tel (d) Nimbu pani
✅ (c) Khaane ka tel: tel ke kan cheeni ke kanon ko alag nahi kar paate.
(a), (b) paani mein cheeni ghulti hai (garam mein aur jaldi).
(d) nimbu pani bhi zyaadatar paani hai, cheeni ghul jaati hai.
Q8. 10 mL glycerine ko 90 mL paani mein milaya. Solute kaun hai? (a) Paani (b) Glycerine (c) Dono (d) Koi nahi
✅ (b) Glycerine: liquid + liquid mein kam matra wala solute hota hai.
(a) paani zyada hai, isliye solvent.
(c) dono solute nahi ho sakte.
(d) solute zaroor hota hai.
🔗 Assertion–Reason
Options: (a) A aur R dono sahi, aur R, A ko samjhata hai · (b) A aur R dono sahi, par R, A ko nahi samjhata · (c) A sahi, R galat · (d) A galat, R sahi
1. A: ORS ke har ghoont ka swaad ek jaisa hota hai. R: Solution mein solute ke kan poore solvent mein barabar faile hote hain.
✅ (a): barabar failne ki wajah se hi har ghoont ek jaisa hai, isliye R, A ko samjhata hai.
2. A: Chashni mein cheeni solvent hai kyunki uski matra zyada hai. R: Solid + liquid ke solution mein liquid solvent hota hai.
✅ (d): A galat hai (chashni mein paani solvent hai). R sahi hai.
3. A: Chalk wala paani solution nahi hai. R: Chalk ke kan paani mein nahi ghulte aur neeche baith jaate hain.
✅ (a): na ghulna aur neeche baithna hi iske non-uniform hone ka kaaran hai.
📝 Very Short Answer (1 mark)
1. Solution ki paribhasha likho.
Do ya do se zyada cheezon ka uniform mixture solution kehlata hai.
2. Cheeni ke ghol mein solute aur solvent batao.
Solute: cheeni. Solvent: paani.
3. Paani mein na ghulne wali do cheezon ke naam likho.
Reth (sand) aur chalk powder (ya burada).
4. Ek aisa solution batao jisme gas solute ho.
Soda water (CO₂ paani mein ghuli hai).
5. ORS ka poora naam likho.
Oral Rehydration Solution.
📝 Short Answer (2–3 marks)
1. Uniform aur non-uniform mixture mein do antar, example ke saath likho.
(1) Uniform mixture har jagah ek jaisa hota hai; non-uniform mein kan alag dikhte hain. (2) Uniform mein kuch neeche nahi baithta; non-uniform mein kan baith jaate hain ya tairte hain. Example: namak-paani uniform hai, chalk-paani non-uniform.
2. Chashni mein cheeni zyada hone par bhi paani solvent kyun hai?
Kyunki yeh solid + liquid ka solution hai. Cheeni (solid) paani (liquid) ke kanon ke beech ghul kar bikhri hai aur ghol liquid jaisa behta hai. Is tarah ke solution mein liquid hi solvent hota hai, matra chahe jo ho.
3. Liquid + liquid solution mein solute kaise pehchaante hain? Example do.
Jo liquid kam matra mein ho woh solute, zyada matra wala solvent. Jaise 10 mL glycerine + 90 mL paani mein glycerine solute aur paani solvent hai.
4. Ek experiment batao jisse saabit ho ki paani har cheez ko nahi gholta.
Ek glass paani mein reth daal kar hilao: reth neeche baith jaati hai, ghulti nahi. Ya cheeni ko tel mein daalo: woh nahi ghulti, jabki paani mein ghul jaati hai. Isse pata chalta hai ki har solvent har cheez ko nahi gholta.
📝 Long Answer (5 marks)
1. Solution, solute aur solvent ko samjhao. Solute-solvent pehchaanne ke niyam teen examples ke saath likho.
Solution: do ya zyada cheezon ka uniform mixture, jisme hisse har jagah barabar mile hon aur kuch neeche na baithe.
Solute: jo cheez ghulti hai. Solvent: jis mein woh ghulti hai. Solute + Solvent = Solution.
Niyam 1 (solid + liquid): liquid solvent, solid solute. Example: namak-paani, chashni (cheeni zyada hone par bhi paani solvent).
Niyam 2 (liquid + liquid): kam matra wala solute. Example: 10 mL glycerine + 90 mL paani mein glycerine solute.
Gas + liquid: gas solute, liquid solvent. Example: soda water mein CO₂.
Ghulne par solute ke kan solvent ke kanon ke beech bikhar jaate hain, isliye dikhte nahi, par gun (jaise swaad) bane rehte hain.
2. “Kaun ghulta hai, kaun nahi” activity ka varnan karo: saamaan, steps, observation aur nishkarsh.
Saamaan: 5 glass paani, cheeni, namak, chalk powder, reth, burada, chammach.
Steps: har glass mein ek chammach alag cheez daal kar hilao, 5 minute rakho, phir dekho.
Observation: cheeni aur namak ghul gaye, ghol saaf aur ek jaisa. Chalk se paani dhundhla, phir neeche jama. Reth turant neeche. Burada zyaadatar upar tairta.
Nishkarsh: cheeni aur namak paani ke saath solution (uniform mixture) banate hain. Chalk, reth aur burada non-uniform mixture banate hain kyunki woh paani mein insoluble hain.
📰 Case-Based Question
Meena ki maa ek chhoti mithai ki dukaan chalati hain. Subah woh ek bade bhagone mein 2 kg cheeni aur 1 litre paani garam karke chashni banati hain. Dukaan pe garmi mein grahakon ke liye nimbu-soda bhi milta hai. Ek din Meena ne galti se ek glass paani mein chalk ka powder gira diya. Kuch der baad usne dekha ki glass ke neeche safed parat jam gayi hai.
Q1. Chashni mein solute aur solvent kaun hain?
Solute: cheeni. Solvent: paani. Cheeni ki matra zyada hai, phir bhi solid + liquid mein liquid hi solvent hota hai.
Q2. Nimbu-soda mein kaun si gas ghuli hai, aur woh kya hai: solute ya solvent?
Carbon dioxide ghuli hai. Woh solute hai, paani solvent.
Q3. Chalk wala glass solution kyun nahi hai?
Chalk paani mein nahi ghulta, uske kan neeche baith kar parat bana dete hain. Solution mein kuch neeche nahi baithta, isliye yeh non-uniform mixture hai.
Q4. Meena chashni ko upar aur neeche se chakhe toh swaad mein fark milega? Kyun?
Nahi (agar cheeni poori ghul chuki ho). Chashni solution hai, aur solution uniform hota hai, isliye har hisse mein mithaas barabar hogi.
🚀 HOTS
1. Golu kehta hai, “Chai ek solution hai.” Kya chai patti ke saath bani chai, chhaanne se pehle, solution hai?
Chhaanne se pehle nahi: patti ke tukde ghulte nahi, neeche baith jaate hain, isliye woh non-uniform mixture hai. Chhaanne ke baad jo chai bachti hai, usme cheeni, doodh ke kuch hisse aur patti ka rang-swaad ghula hota hai, toh woh lagbhag uniform hai. (Doodh khud ek khaas tarah ka mixture hai jo bilkul saaf solution nahi hota.)
2. Ek glass mein paani hai jo bilkul saaf dikhta hai. Bina chakhe kaise pata karoge ki usme kuch ghula hai ya nahi?
Thoda paani ek saaf plate mein rakh kar uda (evaporate) do. Agar plate pe safed parat bache, toh usme kuch ghula tha. Shuddh paani udne ke baad koi parat nahi chhodta.
3. Priya 100 g paani mein 5 g namak gholti hai. Rohan kehta hai ghol ka vajan 100 g hi rahega kyunki namak “gayab” ho gaya. Kaun sahi hai?
Priya. Ghol ka mass = 100 + 5 = 105 g. Namak gayab nahi hua, bas chhote kanon mein bikhar gaya. Ghulne mein mass nahi ghatta.
🏆 Olympiad Corner
1. 20 g cheeni ko 180 g paani mein ghola. Solution ka mass kitna hoga? (a) 180 g (b) 160 g (c) 200 g (d) 20 g
✅ (c) 200 g: solution ka mass = solute + solvent = 20 + 180 = 200 g. (a) cheeni ko bhoolna galat hai. (b) ghatana galat hai. (d) sirf solute ka mass hai.
2. Pital (brass) mein lagbhag 65% copper aur 35% zinc hota hai, aur yeh ek solid solution hai. Isme solvent kise maanenge? (a) Zinc (b) Copper (c) Dono (d) Hawa
✅ (b) Copper: jab dono hisse ek hi avastha (solid) mein hon, toh zyada matra wala solvent maana jaata hai. (a) zinc kam hai, isliye solute. (c) dono solvent nahi ho sakte. (d) hawa pital ka hissa nahi.
3. Kis jodi se solution BANEGA? (a) Reth + paani (b) Namak + tel (c) Phitkari + paani (d) Burada + paani
✅ (c) Phitkari + paani: phitkari (alum) paani mein ghul jaati hai. (a) reth nahi ghulti. (b) namak tel mein nahi ghulta. (d) burada nahi ghulta.
📚 Aur Padho (External Reference)
- NCERT Class 8 Science Curiosity, Chapter 9 (official PDF)
- DIKSHA: Sarkar ka free learning platform, NCERT ke videos ke liye
💖 CharuMam Motivation
Cheeni jab paani mein ghulti hai, toh woh dikhti nahi, lekin poore glass ko meetha kar deti hai. Aur yaad rakhiye, use ghulne ke liye ek achha “solvent” chahiye.
Aap bhi aise hi ho, beta. Achhe dost, achhi aadatein aur roz ki thodi padhai aapka “solvent” hain. Sahi saath mein aapki mehnat aise ghul jaayegi ki har jagah uski mithaas dikhegi. Bas apna saath sahi chuniye aur roz thoda ghulte rahiye. 🌱
— CharuMam
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