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प्रश्न
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
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उत्तर
CaCO3 → CaO + CO2 => Decomposition reaction
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
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
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FILL IN THE BLANK
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What are chemical reactions?
Complete the statement by filling the gap using an appropriate term from the terms given in the bracket.
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An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
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Potassium fluoride
Write the chemical reaction where the following changes are observed.
Gas is evolved
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
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- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Give balanced equation for the following conversion affected by heat alone on the substance:
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Explain the term chemical reaction with special reference to reactants and products.
Which of the following is not an “element + element → compound” type reaction?
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- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
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Choose the correct option from below:
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
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The reaction of H2 gas with oxygen gas to form water is an example of ______.
Both CO2 and H2 gases are ______.
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