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प्रश्न
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
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उत्तर
If a mixture contains iron fillings as one of the constituents, it can be separated by using a magnet.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Fill in the blank :
The substances which can flow are called ________
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Name the property which allows metals to be hammered into thin sheets.
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.
State whether the following statement is true or false :
Sponge is an example of solid sol.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
What difference in the properties of oil and water enable their separation by a separating funnel ?
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
How will you separate water from mustard oil ?
One of the following does not undergo sublimation. This one is :
Liquids have ______.
Define the term matter.
