AIJobalert.comSarkari Naukri • Behtar Bhavishya

Get Free Job Alerts Request a Job Update

AIJobalert.comSarkari Naukri • Behtar Bhavishya

Class 10 Chemistry: All NCERT Chemical Reactions Revision

This lecture provides a comprehensive review of chemical reactions across four Class 10 NCERT chemistry chapters. It covers reaction classifications, specific observation cues, gas evolution tests, industrial processes, and organic reaction mechanisms.

Science
English
· 6 topics
Checked against the video on 18 Oct 2026

Made by AI from the YouTube video All Chemical Reactions of Class 10 CBSE | Complete Chemistry Revision by Sunil Bhaiya #sunilbhaiya (opens YouTube in a new tab) by Sunil Bhaiya Science, then checked against it. All credit for the teaching goes to the creator. Tap a topic’s time to confirm a fact in the video.

Class 10 Chemistry: All NCERT Chemical Reactions Revision

EnglishWatch the video (opens YouTube in a new tab)

Checked against the video

This lecture provides a comprehensive review of chemical reactions across four Class 10 NCERT chemistry chapters. It covers reaction classifications, specific observation cues, gas evolution tests, industrial processes, and organic reaction mechanisms.

Combination, Decomposition, and Displacement Reactions

Magnesium ribbon forms a protective white layer of magnesium oxide at room temperature (25 degrees Celsius) and must be cleaned with sandpaper before burning.
Must knowBurning magnesium ribbon in air emits a dazzling white light containing ultraviolet rays and forms a white powder of MgO via an exothermic redox combination reaction.
Calcium oxide (quicklime) reacts vigorously with water to form calcium hydroxide (slaked lime), boiling the water with a hissing sound.
Ferrous sulphate heptahydrate crystals (FeSO4.7H2O) lose water upon heating to turn from pale green to white anhydrous FeSO4, and decompose further into reddish-brown Fe2O3, SO2, and SO3.
Lead nitrate [Pb(NO3)2] decomposes thermally to produce a yellow residue of PbO, brown fumes of NO2 gas, and colourless O2 gas.
Silver bromide and silver chloride undergo photolytic decomposition when exposed to sunlight, turning into grey silver metal and releasing bromine vapour or chlorine gas respectively.

Reaction	Reactant Color	Product Color / Residue	Observation
Mg + O2	Silvery grey	White powder	Dazzling white flame (UV rays)
FeSO4.7H2O heating	Pale green	Reddish-brown (Fe2O3)	Irritating burnt match odour (SO2)
Pb(NO3)2 heating	White powder	Yellow residue (PbO)	Brown fumes (NO2)
2AgCl + Sunlight	White solid	Silvery grey (Ag)	Greenish-yellow gas (Cl2)

Displacement, Double Displacement, and Redox Reactions

Iron nails placed in blue copper(II) sulphate solution turn reddish-brown due to deposited copper while the solution turns pale green (FeSO4).
Zinc displaces copper from copper sulphate solution to yield a colourless zinc sulphate (ZnSO4) solution and deposited reddish-brown copper.
Lead displaces copper from copper(II) chloride to form colourless lead(II) chloride and copper.
Must knowPrecipitation reactions are double displacement reactions where cations and anions exchange to produce an insoluble solid such as white BaSO4, yellow PbI2, or white AgCl.
Heating copper in air produces black cupric oxide (CuO), which can be reduced back to reddish-brown copper by passing hydrogen gas over it.
In redox processes, oxidation is the addition of oxygen or loss of hydrogen, while reduction is the removal of oxygen or gain of hydrogen.

Acids, Bases, and Gas Evolution Tests

Reactive metals placed above hydrogen in the reactivity series react with dilute acids to evolve hydrogen gas and produce metallic salts.
Metal carbonates and bicarbonates react with acids to form a metallic salt, water, and carbon dioxide gas.
Must knowHydrogen gas is confirmed when it burns with a squeaky pop sound upon bringing a burning candle near it.
Must knowCarbon dioxide turns lime water [Ca(OH)2] milky due to the formation of insoluble CaCO3; passing excess CO2 clears the milkiness by forming soluble Ca(HCO3)2.
Dry HCl gas does not change the color of dry blue litmus paper because it requires moisture to dissociate into H+ (or H3O+) ions.
Amphoteric metal oxides like Al2O3 and ZnO react with both strong acids and strong bases to yield salt and water.

Salts and Industrial Processes

The chlor-alkali process electrolyses aqueous NaCl (brine) to produce H2 gas at the cathode, Cl2 gas at the anode, and NaOH near the cathode.
Bleaching powder [represented as Ca(OCl)2 or CaOCl2] is synthesized by passing chlorine gas over dry slaked lime [Ca(OH)2].
In the Solvay process, brine, ammonia, and CO2 react to yield sodium hydrogen carbonate (baking soda), which on thermal decomposition yields soda ash (Na2CO3).
Washing soda (Na2CO3.10H2O) is formed by the recrystallisation of soda ash with ten water molecules of crystallisation.
Heating gypsum (CaSO4.2H2O) at 373 K (100 degrees Celsius) drives off 75 percent of its water, producing Plaster of Paris (CaSO4.0.5H2O).
Setting of Plaster of Paris occurs upon mixing with water, reconstituting a hard mass of gypsum within minutes.

Metallurgy: Extraction of Metals

Amphoteric metals such as aluminium and zinc react with strong bases to yield aluminate or zincate salts along with hydrogen gas.
Must knowHeating cinnabar (HgS) in excess air causes roasting to HgO followed by auto-reduction to liquid mercury.
Sulphide ores (like ZnS) are converted to oxides via roasting with excess oxygen, whereas carbonate ores (like ZnCO3) are converted via calcination in limited air.
Reduction of zinc oxide to zinc metal is achieved by heating with coke (carbon), a process referred to as smelting.
Highly reactive metals like sodium cannot be reduced by carbon and must be extracted by electrolytic reduction of their molten chlorides.
The thermite reaction involves the highly exothermic reduction of Fe2O3 by aluminium powder, producing molten iron used to weld railway tracks.

Carbon Compounds Reactions

Addition reactions convert unsaturated hydrocarbons (vegetable oils) containing double or triple bonds into saturated fats (vegetable ghee) using a nickel catalyst at 200 degrees Celsius.
Combustion of saturated hydrocarbons in sufficient air gives a clean blue flame, whereas unsaturated hydrocarbons burn with a yellow sooty flame.
Must knowEthanol is converted to ethanoic acid using strong alkaline KMnO4 or acidified K2Cr2O7 as oxidising agents supplying nascent oxygen.
Alkanes like methane undergo substitution reactions with chlorine in the presence of diffused sunlight to form chloromethane and HCl.
Heating ethanol with ethanoic acid in the presence of concentrated H2SO4 yields sweet-smelling ethyl ethanoate ester via esterification.
Saponification is the alkaline hydrolysis of an ester using NaOH solution to yield ethanol and sodium ethanoate, which is used to manufacture soaps.

Key terms

Quicklime: Calcium oxide (CaO)
Slaked lime: Calcium hydroxide [Ca(OH)2]
Brine: Concentrated aqueous solution of sodium chloride
Bleaching Powder: A chemical mixture represented as Ca(OCl)2 or CaOCl2 formed from dry slaked lime and chlorine
Roasting: Heating sulphide ore strongly in the presence of excess air
Calcination: Heating carbonate ore strongly in the limited supply of air
Thermite Reaction: Exothermic reduction of iron(III) oxide by aluminium powder yielding molten iron
Saponification: Base-catalysed hydrolysis of an ester to regenerate alcohol and produce a carboxylate salt (soap)

Exam tips

While NCERT writes the reaction of lime and water directly as slaked lime aqueous, solid Ca(OH)2 is slaked lime, its clear aqueous solution is lime water, and its milky suspension is milk of lime.
Do not confuse roasting with calcination: remember 'C' for Calcination of Carbonate ores in limited air.

Quick revision

Magnesium ribbon must be cleaned with sandpaper before burning to remove the unreactive MgO layer.
Lead nitrate thermal decomposition produces brown fumes of NO2 gas and a yellow residue of PbO.
Electrolysis of water yields H2 and O2 in a 2:1 volume ratio and 1:8 mass ratio.
Hydrogen gas burns with a pop sound, while carbon dioxide gas turns lime water milky.
Excess carbon dioxide passed through milky lime water clears the solution by forming soluble Ca(HCO3)2.
Plaster of Paris is calcium sulphate hemihydrate (CaSO4.0.5H2O) prepared by heating gypsum to 373 K.
High reactivity metals like sodium are extracted via electrolytic reduction of molten chloride, not aqueous solution.
The thermite process utilizes aluminium as a reducing agent to obtain molten iron for welding tracks.
Concentrated H2SO4 acts as a dehydrating agent converting ethanol to ethene at 170 degrees Celsius.
Alkaline KMnO4 or acidified K2Cr2O7 oxidises ethanol to ethanoic acid.

These notes are made by AI from the video. Use the timestamps to check any important fact against the video before you rely on it.

Have a lecture of your own? Paste the YouTube link and get notes, a quiz and flashcards.

Make notes from a YouTube video

Browse every checked set of notes, filed by exam and subject.

Open the notes library

Made this video? Remove these notes

Open the Science folder →

इंजीनियरिंग मैकेनिक्स: सिस्टम ऑफ फोर्सेस एवं रेजोल्यूशन
यह वीडियो इंजीनियरिंग मैकेनिक्स के प्रारंभिक अध्याय सिस्टम ऑफ फोर्सेस (System of Forces) और रेजोल्यूशन ऑफ फोर्सेस (Resolution of Forces) को समझाता है। इसमें बलों की दिशा, क्वाड्रेंट निर्धारण, कोप्लानर एवं नॉन-कोप्लानर बलों के प्रकार तथा विभिन्न कोणों पर बलों को वियोजित (resolve) करने के चरणबद्ध नियम बताए गए हैं।
Science
हिन्दी
5 topics
18 Oct 2026
By Pradeep Giri Academy
Fluid Mechanics: Statics, Dynamics, and Applications
Comprehensive lecture covering fluid statics, pressure calculations, Pascal's law, manometry, Archimedes' principle, continuity equation, and Bernoulli's equation with exam problem-solving.
Science
English
9 topics
18 Oct 2026
By Competition Wallah
Chemical Reactions and Equations: Class 10 Chemistry Revision Notes
This lecture covers the foundational concepts of chemical reactions, distinguishing physical and chemical changes, and detailing reaction indicators. It demonstrates how to balance chemical equations using the hit-and-trial method while satisfying the law of conservation of mass. Finally, it explores four primary types of chemical reactions—combination, decomposition, displacement, and redox—along with real-life redox effects like rancidity and corrosion.
Science
English
12 topics
18 Oct 2026
By Sunil Bhaiya Science
Reaction Kinetics and Microbial Inactivation
This lecture covers the fundamentals of reaction kinetics in thermal food processing, including zero, first, and second-order reactions. It demonstrates how to determine reaction order and rate constants through linear regression of concentration data. Additionally, it details microbial inactivation kinetics, explaining the concepts and practical applications of D-value and z-value for process optimization.
Science
English
6 topics
18 Oct 2026
By NPTEL IIT Guwahati
Temperature Distribution and Heat Penetration Studies
This lecture covers the principles of thermal process establishment in food processing. It explains the purpose and methodology of temperature distribution (TD) tests in retorts and heat penetration (HP) tests within packaged foods. It also details the mathematical modeling and evaluation methods, including the general method and Ball's formula method.
Science
English
5 topics
18 Oct 2026
By NPTEL IIT Guwahati