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प्रश्न
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
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उत्तर
In some chemical reactions an insoluble precipitate is formed when two solutions are mixed.
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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.
Condensation of steam is not a chemical change.
How do the following help in bringing about a chemical change?
catalyst .
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
How is precipitate formation in a chemical reaction indicated?
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
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A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
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].
______ gas causes tears in our eyes while cutting onions.
The water we drink is a combination of hydrogen and oxygen.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
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?
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Write the equation for the process of formation of rust.
Write a note on the following:
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Write the characteristics of chemical change.
______ is the chemical name of limestone.
