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प्रश्न
Select the correct answer from the choice in the bracket.
The positively charged particle of an atom.
विकल्प
electron
proton
neturon
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उत्तर
proton
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संबंधित प्रश्न
Define: Elements
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Sand
Define Elements.
Give two examples of Metals.
What is meant by 2H and H2
State the number of atoms of CaCO3
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 liquid non-metal is _______.
Indicate whether the following statement is true or false:
Metals can be polished.
Indicate whether the following statement is true or false:
Noble gases are high reactive
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
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 |
Select the correct answer to the statement given below:
A compound containing carbon, oxygen and calcium.
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
What are elements? What are they made of?
______ is a mixture of gases.
