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प्रश्न
Fill in the blank
A new substance is formed in a _______ change.
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उत्तर
A new substance is formed in a chemical change.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
FILL IN THE BLANK
Negatively charged ions are called ..........
Name three reducing agents ?
When electric current is passed through acidulated water ______ of water takes place.
Give an example of the following chemical change.
Two gases combine to form white solid
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
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.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
The chemical change is ______.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Iron and rust are the same substances.
Write the chemical reaction of baking soda with lemon.
