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प्रश्न
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
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उत्तर
Starch solution and milk will show Tyndall effect.
This is because in a milk solution and starch solution (colloidal solutions) the size of solute particles is big enough to scatter the light passing through it.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
All kinds of matter
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
The best evidence for the existence and movement of particles in liquids was provided by :
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What is meant by saying that metals are lustrous ?
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
What elements do the following compounds contain ?
Sugar, Common salt
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Name the process which can be used to recover salt from an aqueous salt solution.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Which one of the following scrap metal cannot be separated by magnetic separation ?
Name one pair of liquids which can be separated by using a separating funnel.
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
The property which allows the metals to be hammered into their sheets is ______.
Rusting of an article made up of iron is called
Define the term matter.
