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प्रश्न
Indicate whether the following statement is true or false:
All elements are artificially prepared
विकल्प
True
False
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उत्तर
False
Correct Statement: All elements are made up of a limited number of basic substances
APPEARS IN
संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
Define: Compounds
Give one example for the following types of mixtures :
misicible liquids
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Vinegar
Indicate whether the following statement is true or false:
Metals can be polished.
Tick (√) the correct alternative from the choice given for the following statement
The most ductile metal.
Explain the difference between Metals and non-metals.
Represent with the help of a simple chart how matter is classified into pure or impure substances & further into elements, compounds & mixtures, with elements further segmented.
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal other than carbon that shows allotropy.
