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प्रश्न
How is the impurity of iron present in several substances removed in industries ?
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उत्तर
The impurity of iron present in several substances in the industries is removed using electromagnets. Waste materials supplied to the industries contain a number of scrap metals including iron.
Iron objects stick to the electromagnet and are collected at a separate place, leaving behind other objects.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Explain why steel is used to make railway lines.
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
The three important metalloids are.............................. and ..........................
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
The element which is not common between the compounds called baking soda and soda ash is
The property/properties which enable copper metal to be used for making electric wires is/are :
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Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
How will you separate a mixture of iron filings and powdered carbon ?
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
Stars including Sun are covered in ______.
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Gases do not diffuse very easily.
Define the term matter.
Define the term matter.
