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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
पर्याय
Oxygen
Diamond
Zinc
Graphite
Gold
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उत्तर
Diamond
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संबंधित प्रश्न
Tick the most appropriate answer
Solutions are
- heterogeneous mixtures.
- compounds
- homogeneous mixtures.
- elements
Is food that we eat a mixture ?
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Indicate whether the following statement is true or false:
A compound is made up of just one kind of atom
Indicate whether the following statement is true or false:
Molecules combine to form atoms
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Write the names of elements from the following symbol:
Ir
Define the terms elements, compounds & mixtures with a view to show their basic difference.
The first letter of an element is always written in ______ letter.
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two or more coloured constituents are soluble in some solvent.
