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प्रश्न
Select the correct answer from the choice in the bracket.
The least reactive metal.
विकल्प
magnesium
silver
copper
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उत्तर
silver
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संबंधित प्रश्न
Fill in the blank
Use of a ................. to separate the components of a mixture of solids is based on the difference in the size of the components
Define the term: Element
Give one example for the following types of mixtures :
misicible liquids
Differentiate between:
Homogenous and heterogenous substances
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Sand
Give two applications of chromatography.
Give two examples of the following.
Inert gases
What is meant by 2H and H2
State the number of atoms of CaCO3
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Give the name of the radical - OH
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 |
Write the names of elements from the following symbol:
Xe
State four differences between – elements, compounds and mixtures with suitable examples.
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
There are ______ number of known elements.
Non-metal conducting electricity :______ :: Metal conducting electricity : Copper
Atoms: Fundamental particle of an element::______ : Fundamental particles of a compound.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
