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प्रश्न
Write true or false :
When potassium iodide solution is added to lead acetate solution a red precipitate is formed.
पर्याय
True
False
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उत्तर
False
APPEARS IN
संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
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
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
Fill in the blank:
The substances which undergo chemical change are called _______
Write true or false :
Hydrogen sulphide has rotten egg smell .
Explain the following reaction with one suitable example of Displacement reaction.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Give an example of a reaction where the following are involved
Electricity
Give an example of a reaction where the following are involved
Catalyst
Write the chemical reaction where the following changes are observed.
Physical state is changed
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Give an example of a photochemical reaction.
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
________ is a chemical substance which alters the speed of a chemical reaction.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
Write the characteristics of chemical change.
______ is the chemical name of rust.
