Advertisements
Advertisements
Question
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not. Explain why?
Advertisements
Solution
Zinc (Zn) is placed above hydrogen in the activity series. It therefore, displaces hydrogen from dilute HCl.
`"Zn"("s") + 2"HCl"("aq") -> "ZnCl"_2("aq") + "H"_2("g")`
Copper is placed below hydrogen and therefore, does not react with dilute HCl.
Cu (s) + HCl (aq) → No action.
APPEARS IN
RELATED QUESTIONS
Explain the following in term Oxidation of gain or loss of oxygen with two example.
What is meant by rust?
Name the following:
The process in which oxygen is added or hydrogen is removed.
Identify the substances that are oxidised and the substances that are reduced in the following reaction.
\[\ce{CuO_{(s)} + H2_{(g)} -> Cu_{(s)} + H2O_{(l)}}\]
How would you change a metal like Cu into its ions?
Complete and balance the following equation:
CuO +__________→ Cu +___________
Complete and balance the following equation:
Fe + H2O →___________+____________
Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine.
Give two tests for a reducing agent.
Identify the following reactions as oxidation or reduction
- Na → Na+ + e
- Fe3+ + 2 e- → Fe+
Identify the oxidising agent (oxidant) in the following reactions
`"CuSO"_4 + "Zn" -> "Cu" + "ZnSO"_4`
Which among the following are physical or chemical change?
Curding of milk
Oxidizing agents are otherwise called ______.
Choose the odd one out and write the reason:
Identify the following reactions as oxidation/reduction/redox reaction
Zn + CuSO4 → Cu + ZnSO4
In the redox reaction:
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
State whether the given chemical reaction is a redox reaction or not. Justify your answer.
\[\ce{MnO_2 + 4HCl->MnCl_2 +2H_2O + Cl_2}\]
