An elements X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance…
An elements X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance of 90% and…
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Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which…
Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements…
Millikan’s contributions to the development of atomic theory is the determination of
Millikan’s contributions to the development of atomic theory is the determination of A. charge on electron B. positive…
An oxide XO2 has a vapour density of 32. What is the atomic mass of…
An oxide XO2 has a vapour density of 32. What is the atomic mass of X? A. 32…
Cancerous growths are cured by exposure to
Cancerous growths are cured by exposure to A. γ – rays B. β – rays C. α –…
A particle that contains 9 protons, 10 neutrons and 10 electrons is a
A particle that contains 9 protons, 10 neutrons and 10 electrons is a A. negative ion B. positive…
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen? [H…
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen? [H = 1, O…
25cm3 of a gas X contains Z molecules at 15oC and 75 mmHg. How many…
25cm3 of a gas X contains Z molecules at 15oC and 75 mmHg. How many molecules will 25…
Sucrose is made up of
Sucrose is made up of A. glucose and glucose B. glucose and fructose C. fructose and fructose D.…
Alkanones are generally obtained by the oxidation of
Alkanones are generally obtained by the oxidation of A. primary alkanols B. secondary alkanols C. tertiary alkanols D.…