Advertisements
Advertisements
Question
When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reaction. Name
- substance oxidised, and
- substance reduced.
Advertisements
Solution
When magnesium ribbon burns in air, it reacts with oxygen to form magnesium oxide.
\[\ce{2Mg_{(s)} + O2_{(g)} -> 2MgO_{(s)}}\]
- Magnesium (Mg)
- Oxygen (O2)
APPEARS IN
RELATED QUESTIONS
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Define redox reaction.
Give scientific reason.
It is reccommended to use air tight container for storing oil for long time.
State whether the following conversion is oxidation or reduction:
K → K+ + e-
Complete and balance the following equation:
\[\ce{K + H2O -> }\]________+ ________
Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example.
Give two test for an oxidising agent.
Write chemical formula for rust.
Find the oxidation number of the elements in the following compounds.
- C in CO2
- Mn in MnSO4
- N in HNO3
Identify the oxidising agent (oxidant) in the following reactions
`"CuSO"_4 + "Zn" -> "Cu" + "ZnSO"_4`
During the reaction of some metals with dilute hydrochloric acid, following observations are made.
The temperature of the reaction mixture rises when aluminium (Al) is added.
Explain this observation giving suitable reason.
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained :
- Write a balanced chemical equation for the reaction involved.
- What other name can be given to this precipitation reaction?
- On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
Oxidizing agents are otherwise called ______.
Identify the following reactions as oxidation/reduction/redox reaction
Zn + CuSO4 → Cu + ZnSO4
Identify the following reactions as oxidation/reduction/redox reaction
2Mg +O2 → 2MgO
Find the oxidation number of the element in the following compound.
Mg in MgO
When hydrogen gas is passed over black copper oxide, a reddish-coloured layer of copper is formed.
Answer the questions that follow based on this reaction.
- Write the equation.
- What type of reaction is it?
- Complete the blanks:
In this reaction, an oxygen atom goes away from CuO (copper oxide), which means that ______ of copper oxide takes place, whereas a hydrogen molecule takes up an oxygen atom and water (H2O) is formed, meaning ______ of hydrogen takes place.
Answer the questions based on the equation below:
\[\ce{CH3 - CH2 - OH ->[{[O]}][K2Cr2O7/H2SO4] CH3 - COOH}\]
- What type of reaction is it?
- What is the role of the chemical written on the arrow?
- Give one example of one such type of chemical as in answer (b).
