Which of the following green house gases has the greatest heat-trapping ability?
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The Chemical formula of Methanol is _____.
Chemical formula for sulphurous acid is:
The Chemical formula of Ammonium nitrate is ___________.
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?
There are ............ metalloids in the modern periodic table.
The common name of lead (II) sulphide is
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