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प्रश्न
Which among the following are physical or chemical change?
Burning of Liquefied Petroleum Gas (LPG)
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उत्तर
Chemical
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संबंधित प्रश्न
Corrosion can be prevented by using ……………. solution.
The chemical formula for rust is.............. .
Define reduction in terms of gain or loss of hydrogen with one example.
In the context of redox reactions, the removal of hydrogen from a substance is known as:
(a) oxidation
(b) dehydration
(c) reduction
(d) dehydrogenation
Give scientific reason.
It is reccommended to use air tight container for storing oil for long time.
Give the general group study of hydrogen with reference to
burning
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+
Reacting with water, an active metal produces
Name:
a gas that is oxidizing as well as a reducing agent.
When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.
When Ag is exposed to air it gets a black coating of ____________.
Identify the reducing agent in the following reactions
`2"H"_2 + "O"_2 -> 2"H"_2"O"`
Which among the following are physical or chemical change?
Heating of an iron rod to red hot
Why do we store silver chloride in a dark coloured bottle?
What is rancidity?
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.
State the change in colour observed in following case mentioning the reason:
Copper powder is strongly heated in air.
The oxidizing agent in the equation \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\] is ______.
