Class 10 Vigyaan Chapter 1: Chemical Reactions aur Equations Solutions

Class 10 ke Vigyaan ke NCERT textbook ka pehla chapter koi mamooli chapter nahi hai—yahi toh poori science ki neev hai. Samjho, har cheez yahin se shuru hoti hai. Ismein hum samjhenge ki chemical reactions aakhir hote kya hain—woh bhi asli zindagi ke examples ke saath—unhe equations ki shakal mein kaise dhaalte hain, aur phir un equations ko balance karna kaise seekhte hain, kyunki bina balance ke toh equation adhoori hai. Aur yakeen maano, yeh concepts sirf yahin tak seemit nahi rehte. Door tak jaate hain. Aage ke chapters mein baar-baar inki zaroorat padegi—acid-base ho, metals ya carbon compounds—isliye ise halke mein lena bhool bhi mat jana, warna baad mein pachhtaoge.

Chapter ka Overview

Is chapter ka solutions aapko har exercise ka poora, step-by-step answer denge. Aur yahin se samajh aayega ki roz ki zindagi mein jo chhoti-badi cheezein hoti hain—jaise iron par rust lag jaana, ya doodh ka khatta ho jaana—ye sab darasal chemical changes hain. Bas yahin se shuruaat hoti hai asli samajhne ki.

Links for Chapter-wise Download NCERT Solution for Class 10 विज्ञान in hindi Language

Here we have provided NCERT Solution for Class 10 विज्ञान in hindi Language, Just select the chapters below to get solution of the same:

अम्ल, क्षारक एवं लवण

धातु एवं अधातु

कार्बन एवं उसके यौगिक

तत्वों का आवर्त वर्गीकरण

जैव प्रक्रम

नियंत्रण एवं समन्वय

जीव जनन कैसे करते हैं

आनुवंशिकता एवं जैव विकास

प्रकाश परावर्तन तथा अपवर्तन

मानव नेत्र तथा रंगबिरंगा संसार

विद्युत

विद्युत धारा के चुंबकीय प्रभाव

ऊर्जा के स्रोत

हमारा पर्यावरण

प्राकृतिक संसाधनों का प्रबंधन

Class 10 Science Chapter 1: Detailed NCERT Solutions

Isko padhne ke baad aapko Chapter 1 ke har important question ka step-by-step solution mil jayega. Hinglish mein likhe gaye hain yeh saare answers, taaki har concept ekdum clear ho jaaye bina kisi jhanjhat ke.

Section 1: Intext Questions ke Solutions

In-text questions textbook ke paragraphs ke beech mein aate hain—yeh aapki concept ki samajh ko test karne ke liye hote hain.

• Think about what’s happening around you right now. Some changes are physical, some are chemical—spot the difference. In a physical change, the substance itself doesn’t become something new. Paper getting cut? That’s physical. The paper’s still paper, just in smaller pieces. Chemical change is a whole different game. Here, a brand-new substance forms — wood burning? That’s chemical—you end up with ash and smoke, not wood anymore. Simple as that.
• Section 1 mein jo Intext Questions hain, unka pehla sawaal hai — magnesium ribbon ko air mein jalao, toh kya hota hai? Balanced chemical equation likhni hai iski. Toh jawab simple hai: 2Mg(s) + O2(g) → 2MgO(s). Bas yahi hai. Aur is reaction mein jo naya cheez banti hai, woh hai Magnesium Oxide, yaani MgO.

Section 2: Exercise ke Important Questions

Section 2 ke exercise wale questions—jo chapter ke bilkul end mein diye gaye hain—inhe halke mein mat lena. Ye exams ke liye gold mine hain. Practice karna — bilkul zaroori hai. Kuch log inhe skip kar dete hain, sochte hain "bas sample papers dekh lunga." Galti. Ye questions seedha syllabus se aate hain, aur inki pattern samajhna aapko paper mein aage le jaata hai.

Question 1 (a) mein hum baat kar rahe hain Calcium oxide ki, jo water ke saath react karta hai. Reaction chalte hi Calcium Hydroxide ban jata hai, aur saath mein heat bhi generate hoti hai. Matlab, yeh reaction exothermic hai kyunki isme energy release hoti hai, bahar ki taraf. Balanced equation dekh lo: CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat. Bas, itna hi. Question 2: Fe2O3 + 2Al -> Al2O3 + 2Fe. Is reaction mein dekho, Aluminium, Iron Oxide se iron ko displace kar raha hai, toh yeh ek displacement reaction hai. Aur saath mein, yeh bahut zyada heat bhi produce karti hai, isliye yeh ek exothermic reaction bhi hai.

Section 3: Types of Chemical Reactions

Is chapter mein hum 5 prakar ke reactions padhte hain: Combination, Decomposition, Displacement, Double Displacement, aur Oxidation-Reduction (Redox). Har ek type ko examples ke saath samjhana zaroori hai. Yahan har reaction ka apna alag pattern hai, aur examples ke bina samajhna mushkil ho jata hai. Isliye hum har ek ko detail mein dekhenge.

Jaise Decomposition Reaction ki baat karein, toh ek single compound hi tut kar do ya zyada simpler substances mein badal jaata hai. Jaise yeh example dekho: 2FeSO4(s) ->. Fe2O3(s) + SO2(g) + SO3(g). Isko heat ke through karte hain, isliye ise thermal decomposition bolte hain.

Section 4: Balancing Chemical Equations - Step-by-Step Guide

Balancing chemical equations? That’s the real meat of this chapter, no question. You can’t skip it and expect to survive the rest. So here’s how you do it, step by step—just follow along, don’t rush, and you’ll get there.

1. Alright, so the very first thing you do is write down the skeletal equation. That’s just the unbalanced one, showing reactants on the left and products on the right. Don’t overthink it yet.
2. Count the atoms for each element on both sides. That’s where you start—no shortcuts. Just tally them up, left side and right side, and see where things don’t match up.
3. Balancing a chemical equation really comes down to one thing: putting the right numbers—those coefficients—in front of the formulas. You stick them right before the reactants and the products, and that’s it. No changing the formulas themselves, just the numbers that scale everything up or down. It sounds simple, but it’s where most people trip up. You’re not rewriting the molecules here, just tweaking how many of each you’ve got on both sides.
4. Here’s the rewritten paragraph: Look, the golden rule here is simple: those little numbers tucked inside a formula—like the 2 in H2O—are off-limits. Never, ever touch them. You’re balancing the equation, not rewriting the molecule’s identity, so leave those subscripts exactly as they're. It’s tempting to tweak them when things don’t line up, but that’s a one-way ticket to a wrong answer. Keep your hands off, and you’re already halfway there.
5. Keep tweaking those coefficients until the atoms on each side finally match up. Don’t stop early—just adjust, check, and adjust again, every single time. That’s the whole game, really. For each element, count what you’ve got on the left, then count what’s on the right. If they’re not equal, change the coefficient, not the formula. Keep going like that, back and forth, until the numbers line up perfectly. That’s when you know you’re done.

Ek example lete hain—hydrogen aur oxygen milke water banate hain. Pehle likho: H2 + O2 → H2O. Ab dekho, ye balance nahi hai, toh thoda adjust karo. 2H2 + O2 → 2H2O likho. Ho gaya—ab dono taraf 4 hydrogen atoms hain aur 2 oxygen atoms, bilkul barabar.

Section 5: Chapter ke Important Points yaad rakhein (Key Takeaways)

Yaar, chemical reaction ka matlab hi hai—naye substances ka banna. Simple si baat hai. Chemical Equation reactants aur products ko symbols aur formulae ke through dikhati hai—bas yahi iska kaam hai. Balanced equation — that’s non-negotiable. The Law of Conservation of Mass says so—atoms don’t just vanish or pop out of thin air. So if your equation’s off, you’re basically breaking the rules of chemistry. Get it balanced, and you’re golden. Simple as that. Electron ka transfer hi Redox reactions ki jaan hai. Oxidation aur Reduction, yeh do cheezein kabhi alag nahi hoti—ek side electron deta hai, toh doosri leta hai. Simple baat. Bas itna yaad rakho: jo electron khota hai, woh oxidize hota hai. Aur jo paata hai, woh reduce. Seedha aur saaf. Rancidity aur corrosion—yeh dono aapki kitchen aur ghar ke aas-paas ke sabse aam chemical reactions hain, bas humein nazar nahi aate. Socho, jab ghee ya mithai ka taste kharab ho jata hai, ya lohe ke pipe mein zang lag jata hai—yeh sab chemistry ka daily routine hai. Aasaan bhasha mein samjho toh, yeh reactions hain jo hamesha hote rehte hain, chahe hum dhyan dein ya na dein. Bas itna yaad rakho: science sirf kitaabon mein nahi, humari roti, daal, aur chhat ke bhi andar hoti hai.

In solutions se Chapter 1 ke concepts clear ho jaate hain, koi shak nahi. Bas regular practice karte raho, toh equations balancing mein dheere-dheere expert ban jaoge. Aur yeh jo foundation banega, aage ke chapters mein kaam aayega.