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प्रश्न
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Pressure
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उत्तर
Pressure:
It causes the reacting molecules, to come together and collide with greater intensity.
Example:
Production of ammonia.
\[\ce{N2 + 3H2 ⇌[Fe - 450°C][200 atoms.] 2 NH3 + \triangle}\]
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संबंधित प्रश्न
Complete and balance the following equation:
NaOH + ............ 
Na2 SO4 + H2O
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are elements.
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When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
What is the colour of this precipitate? Name the compound precipitated.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – lead [IV] oxide.
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
\[\ce{C +2S -> CS2}\]
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Heat energy
CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]
State the information provided by the above chemical equation.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Fe2O3 + 2H2 → 2Fe + 3H2O
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
