Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?

एका वाक्यात उत्तर

Oxygen is an element. It contains the atoms of oxygen of the same kind.

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पाठ 10: Matter Around Us - Exercise [पृष्ठ १२४]

पाठ 10 Matter Around Us
Exercise | Q VI. 2. | पृष्ठ १२४

Define a pure substance. How many types of pure substances do you know?

State the number of atoms of CaCO₃

Give the name of the radical - CO₃

Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.

Select the correct answer from the choice given below.
The element which is malleable

Write the names of elements from the following symbol:

Select the correct answer to the statement given below:

A non-metal which exists in the liquid state.

Give a reason for the following statement:

Components in a mixture are present in varying proportions and not in a fixed proportion.

Give an example of two liquids which form homogenous.

Select the correct answer from A, B, C, D & E for the statement given below :

A diatomic molecule.