Advertisements
Advertisements
प्रश्न
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
विकल्प
oxidation
reduction
उत्तर
reduction
\[\ce{Cl- ->Cl}\] [∵ gain of electron]
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
Give reason.
Acidic soil is treated with quick lime.
Give reason.
Wasp sting is treated with vinegar.
What are oxides ?
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
Define chemical reaction.
Explain the following reaction with one suitable example of Displacement reaction.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
What happens when cane sugar is strongly heated? Mention any two changes in it.
The chemical change is ______.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
Acid rain is a result of ______.