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प्रश्न
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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उत्तर
During a chemical reaction transfer of energy takes place.
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संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
What are homogenous reactions ?
Is kerosene an electrolyte or a non-electrolyte ?
Explain the type of reactions on the basis of the direction of reaction.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Explain by writing a word equation.
Respiration is a chemical change.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give a chemical test to distinguish between the following gases.
HCl and H2S
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
The changes in which new substance with new chemical properties are formed are ______.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Write the equation for the process of formation of rust.
