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प्रश्न
Give one example of an endothermic reaction.
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उत्तर
When nitrogen and oxygen are heated to a very high temperature (about 3000°C), they combine to form nitrogen monoxide, and a large amount of heat is absorbed in this reaction.
\[\ce{\underset{Nitrogen}{N2_{(g)}} + \underset{Oxygen}{O2_{(g)}} + Heat -> \underset{Nitrogen monoxide}{2NO_{(g)}}}\]
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संबंधित प्रश्न
Give one example of a chemical reaction.
What do you understand by endothermic reactions?
One of the following is an exothermic reaction. This is:
A colourless lead salt, when heated, produces a yellow residue and brown fumes.
(a) Name the lead salt.
(b) Name the brown fumes.
(c) Write a chemical equation of the reaction involved.
Balance the following equation. Also name the product formed.
`"NaNO"_3 → "NaNO"_2 + "O"_2` Name of product (s)
While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:
Mass of water in the beaker = 40 g
Mass of raisins before soaking = 5 g
Mass of raisins after soaking for 2 hours = 8 g
Mass of water left in the beaker after the experiment = 35 g
The percentage of water absorbed by raisins is:
Balance the following equation:
Pb3O4 → PbO + O2
Balance the following equation:
NO2 +H2O → HNO2 + HNO3
Write the balanced chemical equation of the following reaction. sodium hydroxide + sulphuric acid → sodium sulphate + water
Write the balanced chemical equation of the following reaction. potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
Write the balanced chemical equation of the following reaction.
potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
Write the balanced chemical equation of the following reaction.
aluminium sulphate + sodium hydroxide → sodium sulphate + sodium meta aluminate + water.
Define: Endothermic reaction
Answer the following question:
How do acids and bases react with each other? What is the name of the process? What product is obtained from these reactions?
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.
Write word equation for the following molecular equation:
Na2SO3 + 2HCl [dil.] → 2NaCl + H2O + SO2 [g]
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Copper [II] sulphate to sodium hydroxide.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Fe2O3 + 2H2 → 2Fe + 3H2O
When aqueous solutions of potassium iodide and lead nitrate are mixed an insoluble substance separates out. The chemical equation for the reaction involved is:
