Chemical formula for sulphurous acid is:
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What are Aldehydes ?
The Chemical formula of Ammonium nitrate is ___________.
The Chemical formula of Methanol is _____.
The common name of lead (II) sulphide is
There are ............ metalloids in the modern periodic table.
Atomic number of an atom gives the number of which of the following ?
The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 2nd group and the 4th period?
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