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प्रश्न
Give a chemical test to distinguish between the following gases.
HCl and Cl2
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उत्तर
| Hydrogen chloride | Chlorine |
| Colour of gas: The gas is colourless. | Colour of gas: The gas is greenish-yellow. |
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संबंधित प्रश्न
Write true or false .
A black residue is formed when sugar is heated .
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Water boiling into water vapour is an example of chemical change.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
______ is the chemical name of limestone.
