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3. a. The gas is H2S (hydrogen sulphide). Production of hydrogen sulfide can be detected when ferrous sulfide, a black precipitate, is produced as a result of ferrous ammonium sulfate reacting with H2S gas
b. Hydrogen sulphide is typically evolved from iron sulphide, that is broken into small lumps and then treated with dilute hydrochloric acid or sulfuric acid

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- a  brown gas is formed.
- CuO is black

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if u burning splinter is introduced it starts burning duue to the presence of oxygen

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turns moist blue litmus red (acidic in nature)

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It turns moist blue litmus paper red

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color of CuO is black

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Two colorless gas (NH₃) AND (HCl) is formed.

NH₄Cl - White sublimate

it is a reversible reaction;
bought about by heat ONLY and thus called THERMAL DISSOCIATION

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- Pb(NO3)2 is a white crystals
- brown gas is formed, pungent odour, which is acidic in nature.
- another colourless and odourless gas is formed. this gas when introduced to a glowing splinter catches fire, and is neutral to litmus test.
- Decomposition and endothermic.

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decomposition reaction

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burning splinter is introduced it start burning due to the presence of oxygen

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this is a decomposition reeaction
ab--> a+b

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(NH4)2Cr2O7 ---> N2 + 4H2O + Cr2
endothermic reaction,
thermal dissociation

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Sublimation and Deposition of Iodine

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What is the name of gas A?
Sulpher dioxide

Changes orange or yellow solution green.