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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
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
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
Fill in the blank:
The substances which undergo chemical change are called _______
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Define the following term:
Precipitate
Give an example of a reaction where the following are involved:
Close contact
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Limestone contains ______ mainly.
A chemical change may involve –
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
______ is the chemical name of rust.
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
