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प्रश्न
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
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उत्तर
Melting of ice, melting of butter
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संबंधित प्रश्न
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
Explain,giving one example of the following chemical changes:
Reversible reaction
What do you understand by precipitation reaction? Explain with examples.
Give a chemical test to distinguish between the following gases.
HCl and H2S
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
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 – Addition of dilute hydrochloric acid to silver nitrate.
Rusting of iron is ______.
When magnesium is burnt in the air, a new substance is formed which is ______.
