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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

What Are Molecules ?

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प्रश्न

What are molecules ?

एका वाक्यात उत्तर
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उत्तर

Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.

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पाठ 1: Matter and Its Composition - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 1 Matter and Its Composition
Additional questions | Q 7

संबंधित प्रश्‍न

Fill in the blank :

The state of matter with definite volume and definite shape is called______


Fill in the blank

Any matter which has a definite _______ but no definite shape is called a _______


Define matter. Give four examples of matter.


Which type of elements, metals or non-metals, show the property of brittleness ?


Name one element, one compound and one mixture.


You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?


Which of the two will scatter light : soap solution or sugar solution ? Why ?


A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.


If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.


Fill in the following blank :

Milk is a .................... solution but vinegar is a .................... solution.


How will you test whether a given solution is a colloidal solution ?


What will happen if a saturated solution is :

  1. heated
  2. cooled

What difference in the property of two miscible liquids enables their separation by fractional distillation ?


What difference in the properties of oil and water enable their separation by a separating funnel ?


How will you separate a mixture containing sand and sugar ?


How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).


The technique which is used to separate particles of a solid suspended in a liquid quickly is called :


Which of the following cannot be separated from air by the process of fractional distillation ?


What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?


Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?


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