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प्रश्न
The chemical change is ______.
पर्याय
water to clouds
growth of a tree
cow dung to bio-gas.
ice-cream to molten ice-cream.
उत्तर
The chemical change is cow dung to bio-gas.
APPEARS IN
संबंधित प्रश्न
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
State what you would observe when the following substance is heated in a glass test tube red lead.
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
What is the role of a catalyst in a chemical reaction?
What is the difference between reactants and products?
