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
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
Hydrolysis of NCl3 gives NH3 and X. Which of the following is X?
HClO4
HClO3
HOCl
HClO2
C.
HOCl
Hydrolysis of NCl3 gives NH3 or NH4OH and HClO as-
NCl3 + 4H2O → NH4OH + 3HOCl
Which of the following is not a peroxy acid ?
Perphosphoric acid
Pernitric acid
Perdisulphuric acid
Perchloric acid