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प्रश्न
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
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उत्तर
True Solutions: Salt solution and sugar solution.
Colloidal Solutions: Starch solution, ink, and blood
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संबंधित प्रश्न
Solids have definite shape and definite volume.
Liquids have definite shape and definite volume.
The best evidence for the existence and movement of particles in liquids was provided by :
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
What is the other name for impure substances ? Give two examples of impure substances.
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.
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Define Aerosol Give one example.
One of the following is a solid foam. This one is :
Name the process you would use to separate a mixture of water and alcohol.
Which of the following cannot be separated from air by the process of fractional distillation ?
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
Give an example of liquid in gas.
