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प्रश्न
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
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उत्तर
Metals: Mercury, sodium, magnesium, copper
Non-metals: Diamond, sulphur, iodine, carbon, helium
Metalloids: Arsenic, germanium, boron
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संबंधित प्रश्न
All kinds of matter
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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
Name the property which enables metals to be drawn into wires.
State two physical properties on the basis of which metals can be distinguished from non-metals.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Choose the correct answer.
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Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
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Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Explain how, impure copper sulphate can be purified by crystallisation.
What is chromatography ? State its two applications.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Define the term matter.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
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Which statement is not correct for a mixture
Solid is an arrangement of particles ______.
