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Q17) The maximum concentration of nitrogen is present in: [AFMC 2003]



SOLUTION

nitrolim is -- CaCN2
calcium ammonium nitrate -- 5Ca(NO3)2. NH4NO3 .10H2O
ammonium sulphate -- (NH4)2SO4
urea -- CH4N2O
Urea contain 28% of ammonia which highest of all above
Answer: (d)


Q18) Which is the most reactive species of phosphorus? [AFMC 2003]



SOLUTION

White phosphorus reacts with moist air. It is the most reactive in phosphorous allotropes
Answer: (a)



Q19) In aqua-regia the ratio of conc. HNO3 and conc. HCl present is : [2003]



SOLUTION

one part HNO3and three part HCl
Answer: (a)



Q20) Which of the following is pyrophosphoric acid [ AIIMS 1987]



SOLUTION

pyrophosphoric acid is obtained by condensing two molecules of H3PO4
Answer: (b)


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