Which of the following are isoelectronic species ?
A. H+ H H-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+
Chemistry Mcqs
1 a.m.u =__________________?
1 a.m.u =__________________?
A. 1.6 x 10-27 kg
B. 1.6 x 10-24 kg
C. 1.6 x 10-26 kg
D. 1.6 x 10-28 kg
The properties of an element mosly corresponds to that isotope which has greater_________________?
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
For which of the following compounds the term empirical formula cannot be applied ?
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__________________?
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__________________?
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)
Which of the following is not a macromolecule ?
Which of the following is not a macromolecule ?
A. sand
B. haemoglobin
C. diamond
D. maltose
Mostly elements have fractional atomic masses because of______________________?
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
Percentage of calcium in calcium carbonate is___________________?
Percentage of calcium in calcium carbonate is___________________?
A. 80%
B. 30%
C. 40%
D. 20%
How many isotopes have odd atomic number ?
How many isotopes have odd atomic number ?
A. 154
B. 280
C. 86
D. 300