Question

Chemical formula of a compound is
M3X. Valencies of elements Mand X
are respectively -
1 and 3
2 and 4
3 and 1
2 and 3​

Answer 1

Explanation:

Element X is Na.Its oxide is Na2O and mass will be = 23 + 23 + 16 = 62

Element Y is Al and oxide is Al2O3 and mass will be 27+ 27 + {16*3} = 102.

Element Z is sulphur and oxide is SO2 and mass = 32 + {2*16} = 64

Difference in atomic mass of X and Y = 4.

32/4 = 8 = Oxygen's atomic no.

Answer 2

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