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प्रश्न
Which among the following are physical or chemical change?
Evaporation of petrol
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उत्तर
Physical
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संबंधित प्रश्न
Give one example of an oxidation-reduction reaction which is also a displacement reaction.
Define the following in terms of gain or loss of hydrogen with one example:
Oxidation
State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.
PbO + CO → Pb + CO2
Divide the following reactions into oxidation and reduction half-reaction:
Zn + Cu2+ → Cu + Zn 2+
Divide the above equation into oxidation and reduction half-reactions.
A metal oxide that is reduced by hydrogen is
Name:
a substance that oxidizes concentrated HCl to chlorine.
Name:
a substance that will reduce aqueous Iron(III)ions to iron(II)ions.
Name:
a liquid that is an oxidizing agent as well as a reducing agent.
Complete and balance the following equation:
Zn +_________________→ZnCl2 + H2
Complete and balance the following equation:
CuO +__________→ Cu +___________
State a reason why, when hydrogen is passed over heated copper oxide, the resultant product formed, differs in colour from the original reactant.
Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example.
State what is oxidising agent. Give an example of oxidising agent in the gaseous, liquid, and solid form.
Rusting of iron involves a chemical reaction which is a combination of:
Which among the following are physical or chemical change?
Burning of Liquefied Petroleum Gas (LPG)
Which among the following are physical or chemical change?
Curding of milk
Write a short note on oxidizing and reducing agents.
The tarnishing of metals is due to the formation of ______.
Find the oxidation number of the element in the following compound.
Zn in ZnSO4
