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प्रश्न
Correct the following statement:
CO and Co both represents cobalt.
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उत्तर
CO is a Carbon monoxide and Co is an element named Cobalt.
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संबंधित प्रश्न
What are the different types of mixtures ?
Give Two Examples for Each of the Following: Non-metals
State four differences between compounds and mixtures.
Name: a Metal Which is brittle
Give two examples of Metalloids.
Define: Atom
Give reason: Graphite is used to make a lead of the pencils.
Answer the following question:
Why are copper and aluminium used to make electric wires?
Find the atomicity of the Following molecule:
Dinitrogen Oxide
Fill in the blank
A diatomic gaseous element is _______.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Give the name of the radical - SO4
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
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 |
State four differences between – elements, compounds and mixtures with suitable examples.
Select the correct answer to the statement given below:
The chemical name for dinitrogen oxide [N20].
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
Elements are made up of______ kinds of atoms.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Name the constituents of water.
