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प्रश्न
Balancing a chemical equation is based on
पर्याय
Law of conservation of mass
Mass of reactants and products
Symbols and formulae
None of the above
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उत्तर
Law of conservation of mass.
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संबंधित प्रश्न
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
What are biocatalysts ?
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
Fill in the blank
A new substance is always formed in a _______ change.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
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Write the chemical reaction where the following changes are observed.
Precipitate is formed
What do you observe? When
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\[\ce{NH3 + O2 ->[\Delta]}\]
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
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- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
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Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Complete the table given below.
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If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
Write the chemical reaction of baking soda with lemon.
Write a note on the following:
Fermentation
