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प्रश्न
Balance the given equation:
Fe + O2 
Fe2O3
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उत्तर
4Fe + 3O2 → 2Fe2O3
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संबंधित प्रश्न
Correct and balance the following equation:
Ca + H2O 
CaOH + H
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are non-metals.
State one characteristic of the chemical reaction which takes place when quicklime is treated with water
Give one example of an endothermic reaction.
The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) potassium dichromate solution and sulphur dioxide
(b) potassium permanganate solution and sulphur dioxide
(c) potassium permanganate solution and lemon juice
(d) potassium dichromate solution and carbon dioxide.
Which of the following is not an endothermic reaction?
(a) CaCO3 → CaO + CO2
(b) 2H2O →2H2 + O2
(c) 6CO2 + 6H2O → C6H12O6 + 6O2
(d) C6H12O6 + 6O2 → 6CO2 + 6H2O
Name the various types of chemical reactions.
Write word equation for the following skeletal equation:
\[\ce{FeCl2 + Cl2 -> FeCl3}\]
Write word equation for the following skeletal equation:
\[\ce{Ca + O2 → CaO}\]
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
Balance the following equation. Also name the product formed.
K2O + H2O → KOH
Balance the following equation:
Zn + KOH → K2ZnO2 + H2
Balance the following equation:
MnO2 + HCl → MnCl2 + H2O + Cl2
Balance the following equation:
KOH + Cl2 → KCl + KClO + H2O
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – lead [IV] oxide.
What is meant by ‘reactants’ and ‘products’ in a chemical equation?
Balance the following simple equation:
H2S + Cl2 → S + HCl
Balance the following simple equation:
Zn + NaOH → Na2ZnO2 + H2
What are products? Explain with the help of example.
Which of the following statements about the given reaction are correct?
`3"Fe"("s") + 4"H"_2"O"("g") -> "Fe"_3"O"_4("s") + 4"H"_2("g")`
- Iron metal is getting oxidised
- Water is getting reduced
- Water is acting as reducing agent
- Water is acting as oxidising agent
