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प्रश्न
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
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उत्तर
When sodium chloride is added to the silver nitrate solution, a white curdy precipitate of silver chloride is formed.
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संबंधित प्रश्न
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Fill in the blank
A new substance is always formed in a _______ change.
Fill in the blank.
Melting of ice is a _______ change.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Give an example of the following chemical changes.
A reaction where colour change is noticed.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
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(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
