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प्रश्न
Why zinc and aluminium are considered to have a unique nature. Give balanced equations to support your answer.
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उत्तर
They react with acids and can even react with hot concentrated alkalis to form hydrogen and soluble salt.
Zn + 2NaOH → Na2ZnO2 + H2
2Al + 6NaOH→ 2Na2Al O3 + 3H2
Oxides and hydroxides of zinc and aluminum are amphoteric. They react with both bases and acids to give salt and water.
ZnO + 2HCl → ZnCl2 + H2O
ZnO + 2NaOH →Na2ZnO2 + H2O
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संबंधित प्रश्न
In the following reaction between lead sulphide and hydrogen peroxide:
\[\ce{PbS_{(s)} + 4H2O2_{(aq)} -> PbSO4_{(s)} + 4H2O_{(l)}}\]
- Which substance is reduced?
- Which substance is oxidised?
The process of respiration is ______.
You are given the following chemical equation:
\[\ce{Mg_{(s)} + CuO_{(s)} -> MgO_{(s)} + Cu_{(s)}}\]
This equation represents:
Fill in the blank
Oxidation is the removal of ......................and addition of ....................
Name:
a solid that is an oxidizing agent.
Complete and balance the following equation:
Zn +_________________→ZnCl2 + H2
With reference to oxidation & reduction reaction – complete the statement given by filling in the blanks with only the words (a) Addition (b) Removal.
‘Oxidation is a chemical reaction involving ____ of oxygen to a substance or ____ of hydrogen from a substance. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance.
Rusting of iron involves a chemical reaction which is a combination of:
In the reaction of iron with copper sulphate solution:
CuSO4 + Fe → Cu + FeSO4
Which option in the given table correctly represents the substance oxidized and the reducing agent?
| OPTION | Substance Oxidized | Reducing Agent |
| A | Fe | Fe |
| B | Fe | FeSO4 |
| C | Cu | Fe |
| D | CuSO4 | Fe |
Identify the oxidising agent (oxidant) in the following reactions
`3"Fe" + 4"H"_2"O" -> "Fe"_3"O"_4 + 4"H"_2`
