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a) Calcium flouride is a compound, Barium is a element
Hydrogen nitrate is a compound, Copper is a element, Magnesium oxide is a compound and Aluminium Oxide is a compound.
b) Calcium, Flourine, Aluminium, oxygen, nitrogen, hydrogen, copper, magnesium.
Q3: 2N + 3O2 -------- 2N2O3.
2Zn + 2HNO3 --------- 2Zn(NO3)2 + H2
4Al + 3O2 --------- 2Al2O3
CaCO3 + 2HCL --------- CaCl2 + H2O + CO2
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