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प्रश्न
Select the correct answer to the statement given below:
A compound containing carbon, oxygen and calcium.
पर्याय
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
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उत्तर
Chalk
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संबंधित प्रश्न
Define mixture.
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Name: a non-metal which is lustrous
Name: Three different forms of carbon
Name: A form of carbon used as a gem
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Fill in the blank
A metal which is a poor conductor of electricity is _______.
Fill in the blank
A liquid non-metal is _______.
Tick (√) the correct alternative from the choice given for the following statement.
Sulphur and carbon are
Differentiate between the terms –
elements, compounds & mixtures.
Write the names of elements from the following symbol:
Fe
Explain the difference between Atoms and molecules.
Select the correct answer to the statement given below:
A metalloid
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
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 |
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
Name the constituents of water.
Complete the table:
| Element | Latin Name | Symbol |
| Mercury | ______ | Hg |
| Lead | Plumbum | ______ |
| Iron | ______ | Fe |
| Potassium | Kalium | ______ |
Reason out
Elements are called semimetals.
