State whether following statements are true or false
a) Mass of 1 mole of substance is called as its formula mass .
b) Thomson proposed that nucleus of an atom contains protons and neutrons .
c) An electron has a mass much less than a proton .
d) Ina pure chemical compound , elements are always present in a definite proportion by mass .
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Answer:
a.false
b.false
c.true
d.true
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