Chlorine atom, in its third excited state, reacts with fluorine to form a compound X. The formula and shape of X are :
ClF5, pentagonal
ClF4, tetrahedral
ClF4, pentagonal bipyramidal
ClF7, pentagonal bipyramidal
In Fischer-Ringe's method of separation of nobles gas mixture from air ....... is used
90% CaC2 + 10% CaCl2
coconut charcoal
soda lime + potash solution
90% CaCO3 + 10% urea
In the Dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173 K. Which one of the following gaseous mixtures is not adsorbed on to the charcoal?
Ar, Kr
Xe, Ar
He, Ne
Xe, Kr
C.
He, Ne
Among the given options, only He and Ne are remained unadsorbed on the coconut charcoal at -100°C (173 K). This is because their boiling point is less than -100°C (He = 4 K and Ne = 27 K).
Which of the following is not correct?
Iodine oxidises sodium thiosulphate to sodium tetrathionate
Sodium thiousulphate is soluble in water
Ozone is used to identify the presence of unsaturation in alkenes
Sodium thiosulphate reacts with iodine to form sodium sulphate
Which one of the following pairs of reactants does not form oxygen when they react with each other?
F2, NaOH solution (hot, conc.)
F2, H2O
Cl2, NaOH solution (cold, dilute)
CaOCl2, H2SO4 (dilute, small amount)
What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?
Ne > Ar > Kr
Ar > Ne > Kr
Ar > Kr > Ne
Ne > Kr > Ar
Which of the following is not a peroxy acid ?
Perphosphoric acid
Pernitric acid
Perdisulphuric acid
Perchloric acid