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प्रश्न
True or false
New substances are formed in a chemical change.
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Write true or false :
When potassium iodide solution is added to lead acetate solution a red precipitate is formed.
Balancing a chemical equation is based on
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Define an electrochemical reaction.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
What do you observe? When
Barium chloride is added to sodium sulphate solution
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
Give an example of the following chemical changes.
A reaction where colour change is noticed.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Limestone contains ______ mainly.
A reaction between an acid and a base is called ______.
Which of the following is a chemical change?
What is thermochemical reactions?
Write the effects of chemical reactions.
