A. Mass of an atom itself is in fraction
B. Atomic masses are average masses of isobars
C. Atmoic masses are average masses of isotopes proportional to their relative abundance
D. Atmoic masses are average masses of isotopes
12
Percentage of calcium in calcium carbonate is___________________?
0
How many isotopes have odd atomic number ?
A. 80%
B. 30%
C. 40%
D. 20%
0
The number of moles of CO2 which contains 16 g of oxygen is__________________?
A. 154
B. 280
C. 86
D. 300
0
The volume occupied by 2.8 g of N2 at STP______________________?
A. 0.25
B. 0.5
C. 0.75
D. 1
0
Which one of the following has the maximum number of isotopes ?
A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3
0
moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?
A. oxygen
B. carbon
C. tin
D. chlorine
1
Which of the following terms is not used for ionic compound ?
A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole
0
The number of isotopes of elements with even mass number and even atomic number are ________________?
A. formula unit
B. empirical formula
C. molecular formula
D. formula mass
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