# data[].attributes.body
Hydrogen
liberated by action of active metals like magnesium and zinc with dilute hydrochloric acid or dilute sulphuric acid.

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oxygen
liberated on heating-1) metal nitrates line Pb(NO3)2  2)metal oxides like HgO,PbO2 3)oxysalts lilke potassium chlorate,dichromate.permanganate etc.

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Formula-H₂
Nature: Neutral
Colour: Colourlesss
Odour: Odourless
test : a burning wooden splinter is brought near it, it goes off and gas burns with pale blue fame producing pop sound

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Water vapour
it is liberated by heating
a)hydrated salts like copper sulphate pentahydrate
b)metal hydroxides except NaOH and KOH
c)metal hydrogen carbonates or metal hydrogen sulphites

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Formula-O2
Nature-neutral

colour-colourless
test : rekindles a glowing splinter

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Carbon dioxide
Heat metallic carbonate(except sodium carbonate and potassium carbonate) or add dilute acid to any carbonate or hydrogen carbonate.

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Formula: Cl2
- It is a greenish yellow gas having a pungent irritating smell.
-  It turns most blue litmus paper red then bleaches it.
- It turns moist starch iodide paper blue black.

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Carbon dioxide (CO2)
Colourless and odourless gas. Turns moist blue litmus faint red. When the gas is passed through lime water,it turns milky due to the formation of white precipitate of calcium carbonate.

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Formula- NO₂
Nature- acidic
Colour- brown
Odour- irritating
Confirmatory test- it liberates violet vapours (iodine vapour) from potassium iodide solution.

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Nature: Acidic
Color: Colourless
Formula: SO₂
Odour: Pungent smell
It changes orange/yellow solution of acidified potassium dichromate green.

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H2S
H2S has a foul rotten odor smelling like rotten eggs
it is poisounous corrosive and flamable
confirmatiory test: an iron is made to react with H2S if the compound is found to have less bacteria H2S is presence is confirmed.

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Methods of preparation:
a)  by heating metal sulphites except Na2SO3 and K2SO3.
b)  by heating metal hydrogen sulphites.
c)  by the action of metal sulphites or metal hydrogen sulphites with dil. HCl or dil. H2SO4.

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formula=HCl
nature=acidic
colour=colourless
odour=odourless
When the gas is passed through silver nitrate solution,a white precipitqte of silver chloride is formed.

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Liberated when a metal chloride or ammonium chloride is boiled with conc. sulphuric acid

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It is liberated:
- by heating MnO2,PbO2,Pb3O4,KMnO4 or K2CRr2O7 with conc. HCl.
- by the action of bleaching powder with dil. HCl or dil.H2SO4.

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a)sulphur di oxide
acidic potassium dichromate solution turns orange to green

b) The gas is basic in nature.
Ammonia

c) Name of Gas C is Hydrogen Chloride.
The product obtained is Ammonium Chloride (NH4Cl).
Type of reaction: Combination, Neutralization, Exothermic.

d) The gas is acidic in nature
The given gas is chlorine(Cl2).

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-heating of thioacetamide forms H2S.
- It is liberated by the action of dil. HCl or dil. H2SO4 on metal sulfides.

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Preparation- produced on heating a heavy metal nitrate such as copper nitrate.
It is liberated by-
(a) by heating metal nitrates. (except NaNO3 and KNO3)
(b) by heating metal nitrates with conc. H2SO4.

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a) Nitrogen Dioxide
b) Sulphur Dioxide
c) Oxygen

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a) Hydrogen Sulphide. It turns lead acetate paper black.
b) Zinc sulphide and dilute hydrochloric acid

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Formula: H₂O
Nature: Neutral
Colour: Colourless
Test: It turns white anhydrous copper sulphate blue.

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Helium
Neon
Argon
Krypton
Xenon
Radon
Carbon Monoxide
Nitric Oxide