Options:
- A. 80%
- B. 30%
- C. 40%
- D. 20%
View Answer
C. 40%
Chemistry
Mostly elements have fractional atomic masses because of______________________?
Options:
- 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
View Answer
C. Atmoic masses are average masses of isotopes proportional to their relative abundance
Which of the following is not a macromolecule ?
Options:
- A. sand
- B. haemoglobin
- C. diamond
- D. maltose
View Answer
D. maltose
Mass spectrometer is used to determine Mass number of isotopes and___________________?
Options:
- A. Atomic number
- B. Relative abundance
- C. Electronic configuration
- D. All of the above
View Answer
B. Relative abundance
Isotopes of the same elements has__________________?
Options:
- A. different number of protons
- B. same number of neutrons
- C. different number of neutrons
- D. same mass number (nucleon number)
View Answer
C. different number of neutrons
The number of peaks obtained in mass spectrometry shows____________________?
Options:
- A. Relative abundance
- B. Average mass of element
- C. Number of isotopes
- D. Relative isotopic mass
View Answer
C. Number of isotopes
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
Options:
- A. lighter
- B. intermediate
- C. heavier
- D. are collected at same time
View Answer
A. lighter
Empirical formula of chloroform is____________________?
Options:
- A. CH2 C12
- B. CH3C1
- C. CC14
- D. CHCL3
View Answer
D. CHCL3
For which of the following compounds the term empirical formula cannot be applied ?
Options:
- A. NaCl
- B. H2O
- C. CCI4
- D. It can be applied to all mentioned above
View Answer
D. It can be applied to all mentioned above
Molecular mass of water (18g) means__________________?
Options:
- A. 1-mole molecules of water
- B. 1-gram molecule of water
- C. 3-gram atoms
- D. all
View Answer
D. all