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
Chemistry MCQs
The number of moles of CO2 which contains 16 g of oxygen is__________________?
A. 0.25
B. 0.5
C. 0.75
D. 1
How many isotopes have odd atomic number ?
A. 154
B. 280
C. 86
D. 300
Percentage of calcium in calcium carbonate is___________________?
A. 80%
B. 30%
C. 40%
D. 20%
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. Atmoic masses are average masses of isotopes proportional to their relative abundance
D. Atmoic masses are average masses of isotopes
Which of the following is not a macromolecule ?
A. sand
B. haemoglobin
C. diamond
D. maltose
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)
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
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
The properties of an element mosly corresponds to that isotope which has greater_________________?
A. Mass number
B. Atomic mass
C. Relative abundance
D. all of the above
