Advertisements
Advertisements
Question
Why zinc and aluminium are considered to have a unique nature. Give balanced equations to support your answer.
Advertisements
Solution
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
APPEARS IN
RELATED QUESTIONS
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?
In the reaction represented by the equation:
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
- name the substance oxidised.
- name the oxidising agent.
- name the substance reduced.
- name the reducing agent.
Fill in the blank
Oxidation is the removal of ......................and addition of ....................
Identify the substances that are oxidised and the substances that are reduced in the following reaction.
\[\ce{CuO_{(s)} + H2_{(g)} -> Cu_{(s)} + H2O_{(l)}}\]
Give the general group study of hydrogen with reference to
reducing power
Divide the following reactions into oxidation and reduction half-reaction:
Zn + Cu2+ → Cu + Zn 2+
Complete and balance the following equation:
Zn +_________________→ZnCl2 + H2
Give two test for an oxidising agent.
Give two tests for a reducing agent.
Oxidation is a process which involves ____________.
