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प्रश्न
Give the symbols of: Carbon, calcium, copper, chlorine, cobalt, argon.
उत्तर
Carbon is C, Chlorine is Cl, Calcium is Ca, Cobalt is Co Copper is Cu, Argon is Ar.
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संबंधित प्रश्न
Fill in the blan
An ________ is a homogeneous mixture of two or more metals.
What is the difference between a pure substance and a mixture ?
Give Two Examples for Each of the Following: Inert Gases
Differentiate between:
Homogenous and heterogenous substances
Name: Two substances used to make electric wires
Give the name of the radical - SO4
Match the statements in List I – 1 to 10 correct answers in List II-A to J.
| List I | LIst II | ||
| 1 | Fluorine and chlorine | A | Nitrogen |
| 2 | A diatomic molecule | B | Boron |
| 3 | A molecule containing the elements hydrogen and oxygen. | C | Reactants |
| 4 | A metalloid - showing properties of both metals and non-metals. | D | Chemical Formula |
| 5 | The term used for the substances which take part in the chemical reaction | E | Halogens |
| 6 | The term represents a substance by means of symbols. | F | Water |
| 7 | The term used for the substances formed as a result of a chemical reaction | G | Nitric Acid |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | H | Products |
| 9 | The chemical name for nitrogen monoxide. | I | Phosphorus |
| 10 | A polyatomic molecule. | J | Zinc Chloride |
Select the correct answer from the choice given below.
The element which is malleable
‘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.
Give three differences between elements & compounds with relevant examples.
