For which of the following compounds the term empirical formula cannot be applied ?
A. NaCl
B. H2O
C. CCI4
D. It can be applied to all mentioned above
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
A. lighter
B. intermediate
C. heavier
D. are collected at same time
Isotopes of the same elements has__________________?
A. different number of protons
B. same number of neutrons
C. different number of neutrons
D. same mass number (nucleon number)
Mostly elements have fractional atomic masses because of______________________?
A. Mass of an atom itself is in fraction
B. Atomic masses are average masses of isobars
C. Atomic masses are average masses of isotopes proportional to their relative abundance
D. Atomic masses are average masses of isotopes
The number of moles of CO2 which contains 16 g of oxygen is__________________?
A. 0.25
B. 0.5
C. 0.75
D. 1
The volume occupied by 2.8 g of N2 at STP______________________?
A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3
Which one of the following has the maximum number of isotopes ?
A. oxygen
B. carbon
C. tin
D. chlorine