Advertisements
Advertisements
Question
Which one of the following processes involve chemical reactions?
Options
Storing of oxygen gas under pressure in a gas cylinder
Liquefaction of air
Keeping petrol in a china dish in the open
Heating copper wire in the presence of air at high temperature.
Advertisements
Solution
Heating copper wire in the presence of air at high temperature.
Explanation -
Copper will react with oxygen present in air upon strong heating to form copper (II) oxide or cupric oxide.
`2"Cu"+ underset(("Air"))("O"_2) overset("Heat")(->) 2"CuO"`
APPEARS IN
RELATED QUESTIONS
Write the balanced equation for the following chemical reaction.
\[\ce{Hydrogen + Chlorine -> Hydrogen chloride}\]
Balance the following equation:
`Fe+ H_2O → Fe_3 O_4+H_2`
Balance the following equation. Also name the products formed.
`H_2 + CI_2 → HCI`
Balance the following equation. Also name the products formed.
`Na + H_2 O → Na OH + H_2`
Balance the following equation. Also name the products formed.
`Zn+ HCI → ZnCI _2 + H_2`
Balance the following equation. Also name the products formed.
`K_2 O + H_2 O → KOH`
Balance the following equation. Also name the products formed.
`PbCO _3 → PbO +CO_2`
Differentiate between a ‘word equation’ and a ‘molecular equation’ with a suitable example.
Balance the following equation:
\[\ce{K + H2O->KOH + H2}\]
Balance the following equation:
\[\ce{H2S + Cl2->S + HCl}\]
Balance the following important equation:
NaOH + H2SO4 → Na2SO4 + H2O
Balance the following important equation:
ZnO + NaOH → Na2ZnO2 + H2O
Balance the following important equation:
KMnO4 + HCl → KCl + MnCl2 + H2O + Cl2
Balance the following important equation:
NH3 + O2 → NO + H2O (catalytic oxidation of NH3)
It is necessary to balance a chemical equation in order to satisfy the law of:
Magnesium ribbon is rubbed before burning because it has a coating of ____________.
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
Which of the following are combination reactions?
- `2"KClO"_3 overset("Heat")(->) 2"KCl" + 3"O"_2`
- `"MgO" + "H"_2"O" -> "Mg"("OH")_2`
- `4"Al" + 3"O"_2 -> 2"Al"_2"O"_3`
- `"Zn" + "FeSO"_4 -> "ZnSO"_4 + "Fe"`
Which among the following change is exothermic or endothermic in nature?
Decomposition of ferrous sulphate
Identify the types of reaction mentioned above. Give one example for type in the form of a balanced chemical equation.
