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%

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

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

Which of the following are isoelectronic species ?

A. H+ h h-
B. Li+ na+ k+
C. C1- br- i
D. F- ne na+

Molecular ions are formed by passing______________________?

A. High energy electron beam
B. ? – particle
C. X-rays
D. All of the above

Which one is true about isotope ?

A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. Same chemical properties