3. ATOMS AND MOLECULES
easy

निम्न में कितने परमाणु विद्यमान है ?

$(i)$ $H _{2} S$ अण एवं

$(ii)$ $PO _{4}^{3-}$ आयन ?

Option A
Option B
Option C
Option D

Solution

$(i) $ $2$ atom of hydrogen $+$ $1$ atom of sulphur

             $=$ three $(3)$ atoms (in a $H_2S$ molecule).

$(ii)$ $1$ atom of phosphorus $+$ $4$ atoms of oxygen

              $=$ five $(5)$ atoms (in a $PO_4^{3-}$ ion).

Standard 9
Science

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