21 Which of the following statements is wrong about isotopes ? Chemistry Medium Full question → A they possess different mass number B they possess different physical properties C they possess same chemical properties D they possess different position in the periodic table
22 The mass of decimole of electrons (NA) is___________________? Chemistry Medium Full question → A 1.008 mg B 0.184 mg C 0.054 mg D 5.4 mg
23 Which one of the following is not the mono isotopic element ? Chemistry Medium Full question → A arsenic B uranium C iodine D nickel
24 Which of the following terms is used for the mass of chlorine 35.5 ? Chemistry Medium Full question → A relative atomic mass B mass number C atomic weight D relative isotopic mass
25 Size of molecule depends upon________________? Chemistry Medium Full question → A Atomicity B Shape of molecule C Both A and B D Difficult to predict
26 Avogadros number may represent_________________? Chemistry Medium Full question → A volume of particles B number of particles C mass of particles D All of the above
27 The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________? Chemistry Medium Full question → A Gas B Liquid C Volatile solid D All
28 Which of the following ion formation is always exothermic ? Chemistry Medium Full question → A Uni-negative B Uni-positive C Di-negative D Di-positive
29 Which one is true about isotope ? Chemistry Medium Full question → A Same number of neutrons B Same mass number C Same physical properties D Same chemical properties
30 Molecular ions are formed by passing______________________? Chemistry Medium Full question → A High energy electron beam B ? – particle C X-rays D All of the above
31 Which of the following are isoelectronic species ? Chemistry Medium Full question → A H+ H H- B Li+ Na+ K+ C C1- Br- I D F- Ne Na+
32 1 a.m.u =__________________? Chemistry Medium Full question → 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
33 The properties of an element mosly corresponds to that isotope which has greater_________________? Chemistry Medium Full question → A Mass number B Atomic mass C Relative abundance D all of the above
34 For which of the following compounds the term empirical formula cannot be applied ? Chemistry Medium Full question → A NaCl B H2O C CCI4 D It can be applied to all mentioned above
35 When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________? Chemistry Medium Full question → A lighter B intermediate C heavier D are collected at same time
36 Isotopes of the same elements has__________________? Chemistry Medium Full question → A different number of protons B same number of neutrons C different number of neutrons D same mass number (nucleon number)
37 Which of the following is not a macromolecule ? Chemistry Medium Full question → A sand B haemoglobin C diamond D maltose
38 Mostly elements have fractional atomic masses because of______________________? Chemistry Medium Full question → 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
39 Percentage of calcium in calcium carbonate is___________________? Chemistry Medium Full question → A 80% B 30% C 40% D 20%
40 How many isotopes have odd atomic number ? Chemistry Medium Full question → A 154 B 280 C 86 D 300