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प्रश्न
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
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उत्तर
A change in which the substance can be brought back to its original state is called a reversible change.
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संबंधित प्रश्न
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
FILL IN THE BLANK
Negatively charged ions are called ..........
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Write true or false :
Hydrogen sulphide has rotten egg smell .
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Name: Gas with rotten egg smell.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
Burning of paper is a ______ change.
_____ is the basic material to manufacture urea.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
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.
What changes do you expect?
Write the equation for the process of formation of rust.
How would you show that the settling of curd is a chemical change?
When carbon dioxide is passed through lime water ______.
What is the difference between reactants and products?
