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प्रश्न
Which one of the following scrap metal cannot be separated by magnetic separation ?
पर्याय
nickel
cobalt
chromium
steel
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उत्तर
chromium
Chromium does not have magnetic property. Therefore, it will not be attracted by a magnet.
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संबंधित प्रश्न
Solids have definite shape and definite volume.
Liquids have definite volume but do not have definite shape.
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Define matter. Give four examples of matter.
Name the property which enables metals to be drawn into wires.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Name a metal which has a low melting point.
Which of the following is not an element ?
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
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 largest particles ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
What difference in the properties of oil and water enable their separation by a separating funnel ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
How will you separate a mixture containing sand and sugar ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Name the metals that are used in jewellery.
All the matter made of ______.
