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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
Define the following in terms of gain or loss of hydrogen with one example:
Oxidation
Define the following in terms of gain or loss of hydrogen with one example:
Reduction
The electron releasing tendency of zinc is ______ than that of copper.
Describe briefly the ionic concept of oxidation and reduction. Give an equation to illustrate.
For the reaction PbO + H2→ Pb + H2O, which of the following statements is wrong?
Complete and balance the following equation:
Fe + H2O →___________+____________
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.
Give two test for an oxidising agent.
Rusting of iron involves a chemical reaction which is a combination of:
What are reducing agents? Give examples.
