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प्रश्न
How is a flame test performed?
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उत्तर
The flame test is a qualitative test used in chemistry to help determine the identity or possible identity of a metal or metalloid ion found in an ionic compound. If the compound is placed in the flame of a gas burner, there may be a characteristic color given off that is visible to the naked eye.
Example: The test is performed by dipping a wire or wooden splint into a sample solution or coating it with the powdered metal salt. The color of a gas flame is observed as the sample is heated. If a wooden splint is used, it's necessary to wave the sample through the flame to avoid setting the wood on the fire.
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संबंधित प्रश्न
What does the symbol (aq) represent in a chemical equation?
Write the balanced equation for the following reaction, and add the state symbols:
Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.
One of the following does not happen during a chemical reaction. This is:
(a) Breaking of old chemical bonds and formation of new chemical bonds
(b) Formation of new substances with entirely different properties
(c) Atoms of one element change into those of another element to form new products.
(d) A rearrangement of atoms takes place to form new products.
What happens when silver nitrate solution is added to sodium chloride solution?
Write the equation for the reaction which takes place.
Balance the following equation. Also name the product formed.
`"Na"+ "H"_2 "O" → "NaOH"+ "H"_2`
What information does the following chemical equation convey?
Zn + H2SO4 → ZnSO4+ H2
Write the balanced chemical equation of the following reaction.
zinc sulphide + oxygen → zinc oxide + sulphur dioxide
Name the following:
A catalyst which increases the rate of a chemical reaction.
Give an example of a chemical equation in which two reactants form:
three product
Which of the following are exothermic processes?
- Reaction of water with quick lime
- Dilution of an acid
- Evaporation of water
- Sublimation of camphor (crystals)
