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प्रश्न
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
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उत्तर
Calcium carbonate (Marble) — CaCO3
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संबंधित प्रश्न
State the number of atoms of H2SO4
Name: Two substances used to make electric wires
Name A substance used as an insulator.
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Write the names of elements from the following symbol:
Si
Select the correct answer from the choice in the bracket.
The positively charged particle of an atom.
Elements are broadly classified into metals and non-metals. State six general differences in the physical properties of metals and non-metals. State two metals and two non-metals which contradict with the general physical properties – giving reasons. State one difference in property between metalloids and noble gases.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Reason out
Elements are called semimetals.
