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प्रश्न
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
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उत्तर
Molecule: Atoms of the same element or different elements combine to form a molecule. It is the smallest particle of a substance – which can normally exist independently and can retain, the physical and chemical properties of the substance.
Examples
Monoatomic molecule: Metals – Na, Mg, etc.
Diatomic molecule: H2, O2, N2.
Polyatomic molecule: O3, P4.
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संबंधित प्रश्न
Give one example for the following type of mixtures
solid-solid homogenous mixture.
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Name the technique that you use if only the solid component of a solution is required.
Give two examples of the following.
Metals which are soft
Give two examples of the following.
Non-metals which are lustrous
Complete the statement given below by filling in the blanks with the correct words.
From the elements – He, Br, Pt, and O; the element which is metallic is ____, an inert element is ____, forms a triatomic molecule is ____, is liquid at room temperature is_ ___.
Complete the statement given below by filling in the blank with the correct word.
From the elements nitrogen, chlorine, bromine, the element present in the atmosphere is ________.
Select the correct answer to the statement given below:
A metalloid
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.
Give two example of elements.
