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प्रश्न
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
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उत्तर
- 2Na + H2O → 2NaOH + H2
- AgNO3 + NaCl → AgCl + NaNO3
- 2KClO3 → 2KCl + 3O2
- 6CO2 + 6H2O → C6H12O6 + 6O2
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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.
Iron pipes coated with zinc do not get rusted easily.
Complete and balance the following chemical equation:
\[\ce{Pb(NO3)2 ->[Heat]}\]
Give a reason.
Wasp sting is treated with vinegar.
FILL IN THE BLANK
In a ............ change, new substances are formed.
Explain the following reaction with one suitable example of Decomposition reaction
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Give an example of a reaction where the following are involved
Catalyst
What is a chemical change? Give two examples of chemical change?
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
Classify the following processes into physical or chemical changes:
- Beating of aluminium metal to make aluminium foil.
- Digestion of food.
- Cutting of a log of wood into pieces.
- Burning of crackers.
Give an example of a chemical reaction for the following situation:
A change in colour is observed
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 a note on the catalyst.
Write a note on the following:
Curdling of milk
