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प्रश्न
What happens when zinc granules are treated with dilute solution of H2SO4, HCl, HNO3, NaCl and NaOH Also write the chemical equations if reaction oçcurs.
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उत्तर
- With dilute H2SO4: Hydrogen gas evolves -
`"Zn"("s") + "H"_2"SO"_4 ("dil".) -> "ZnSO"_4("aq") + "H"_2("g")` - With dilute HCl: Hydrogen gas evolves -
`"Zn"("s") + 2"HCl" ("dil".) -> "ZnCl"_2("aq") + "H"_2("g")` - With dilute HNO3: Nitrous oxide gas evolves. It is colourless.
`4"Zn"("s") + 10"HNO"_3("aq") -> 4"Zn"("NO"_3)_2("aq") + 5"H"_2"O"("l") + "N"_2"O"("g")` - With NaCl : There is no chemical reaction, with NaOH : Hydrogen gas evolves:
`"Zn"("s") + 2"NaOH"("aq") -> underset("Sod. Zincare")("Na"_2"ZnO"_2("aq")) + "H"_2("g")` - NaOH solution
Zn(s) + 2 NaOH (aq) → Na2ZnO2(aq) + H2
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संबंधित प्रश्न
Which of the statements about the reaction below are incorrect?
\[\ce{2PbO(s) + C(s) → 2Pb(s) + CO2(g)}\]
- Lead is getting reduced.
- Carbon dioxide is getting oxidised.
- Carbon is getting oxidised.
- Lead oxide is getting reduced.
When SO2 gas is passed through saturated solution of H2S, the following reaction occurs:
SO2 + 2H2S → 2H2O + 3S
In this reaction, which substance is oxidised and which one is reduced?
When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?
Explain the following in terms of gain or loss of oxygen with one example:
Reduction
Define the following in terms of gain or loss of hydrogen with one example:
Oxidation
MULTIPLE CHOICE QUESTIONS
The process of adding oxygen to a substance is called
- oxidation.
- reduction.
- displacement.
- hydrogenation.
The electron releasing tendency of zinc is ______ than that of copper.
Give the general group study of hydrogen with reference to
burning
State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.
H2S + Cl2→ 2HCl + S
Divide the above equation into oxidation and reduction half-reactions.
Name:
a substance that oxidizes concentrated HCl to chlorine.
Complete and balance the following equation:
H2 + S → ___________
Select the correct answer from the symbol in the bracket.
The element, which like hydrogen is a strong reducing agent.
Explain the following reaction with their balanced chemical equation.
Hydrogen sulphide reacts with sulphur dioxide.
\[\ce{MnO2 + 4HCl -> + 2H2O + Cl2}\]
Identify the substance oxidized in the above equation.
Identify the reducing agent in the following reactions
`2"H"_2 + "O"_2 -> 2"H"_2"O"`
The tarnishing of metals is due to the formation of ______.
Choose the odd one out and write the reason:
The metallic oxide which can be reduced by using common reducing agents is ______.
