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प्रश्न
Give a chemical test to distinguish between the following gases.
H2 and O2
उत्तर
| Hydrogen | Oxygen |
| Apply a burning splint to the gas: Pure hydrogen burns with a pale blue Flame when a burning splint is brought near it. | Apply a burning splint to the gas: It rekindles a glowing wooden splinter. |
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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
FILL IN THE BLANK
In a ............ change, new substances are formed.
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Fill in the blank:
The substances which undergo chemical change are called _______
Explain the following reaction with one suitable example of Decomposition reaction
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Write the chemical reaction where the following changes are observed.
Precipitate is formed
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
What do you observe when H2S is passed through a lead nitrate solution.
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
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 acid to an active metal.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Write the chemical reaction of baking soda with lemon.
