The mass of decimole of electrons (NA) is___________________? April 15, 2025 by admin A. 1.008 mg B. 0.184 mg C. 0.054 mg D. 5.4 mg
Which of the following statements is wrong about isotopes ? April 15, 2025 by admin 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
Qualitative analysis is carried out for _________________? April 15, 2025 by admin A. identification of elements B. estimation of amounts of elements C. molar ration of elements D. molar volume of elements
Combustion analysis is performed to determine__________________? April 15, 2025 by admin A. Empirical formula B. Molecular mass C. Molecular formula D. Formula mass
Isotopes differ in_________________? April 15, 2025 by admin A. properties which depend upon mass B. arrangement of electrons in orbitals C. chemical properties D. all of the above
Which of the following methods is used to estimate hydrogen in an organic compound ? April 15, 2025 by admin A. Combustion method B. Dumas method C. Kjeldahls method D. All of the above methods are for different purposes
The nucleus of an atom of every element will always contain____________________? April 15, 2025 by admin A. neutrons B. protons and electrons C. protons D. protons and neutrons
When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ? April 15, 2025 by admin A. 0.5 B. 1 C. 1.5 D. 2
Dempsters mass spectrometer has number of zones / parts_________________? April 15, 2025 by admin A. 5 B. 4 C. 3 D. 2
All the following variables are used to describle gases except__________________? April 15, 2025 by admin A. pressure B. volume C. moles D. density
