Q.1
Which is most explosive? [ Roorkeet 1989]
  • a) NCl3
  • b) PCl3
  • c) AsCl3
  • d) All
Q.2
The boiling points of the following hydrides follow the order. [EAMCET 1999]
  • a) SbH3 > NH3 > AsH3 > PH3
  • b) NH3 > PH3 > AsH3 > SbH3
  • c) NH3 > AsH3 >PH3 > SbH3
  • d) SbH3 > AsH3 > NH3 > PH3
Q.3
Which statement is wrong regarding nitrogen? [AFMC 1998]
  • a) Supporter of life
  • b) Hydrogen bonding
  • c) Lighter than air
  • d) Low boiling point
Q.4
4HNO3 +P4O10 → 4HPO3 +X In the above reaction. the product X is [1999]
  • a) NO2
  • b) N202
  • c) N2O4
  • d) N2O5
Q.5
Ammonia and sodium hypochlorite reacts to produce [2000]
  • a) NH2OH
  • b) NH2NH2
  • c) N2
  • d) NO
Q.6
P2O5 is an anhydride of.. [AFMC 2000]
  • a) HPO3
  • b) H3PO4
  • c) H3PO3
  • d) H2P2O7
Q.7
Nessler's reagent is used for the test of [AFMC 2000]
  • a) CO32-
  • b) CO2
  • c) NH4+
  • d) SO42-
Q.8
White phosphorus reacts with caustic soda. the products are PH3 and NaH2O2 ... [ IIT 1980]
  • a) Oxidation
  • b) reduction
  • c) Oxidation and reduction
  • d) Neutralisation
Q.9
PCl5 exists but NCl5does not because .. [ EAMCET 1982]
  • a) Nitrogen has no vacant d-orbitals
  • b) NCl5 is unstable
  • c) Nitrogen atom is much smaller
  • d) Nitrogen is highly inert
Q.10
or the manufacture of NH3 by the following reaction N2 + 3H2 →2NH3+ 21.9 kCal the favorable conditions are [AFMC 2001 ]
  • a) low temperature, high pressure and catalyst
  • b) high temperature, high pressure and catalyst
  • c) high temperature, low pressure and catalyst
  • d) low temperature, low pressure and catalyst
Q.11
Which of the following fluoride does not exist? [ MP CEE 1993]
  • a) NF5
  • b) PF5
  • c) AsF5
  • d) SbF5
Q.12
NH4Cl solution is
  • a) Neutral
  • b) acidic
  • c) basic
  • d) amphoteric
Q.13
The laughing gas is
  • a) Nitrous oxide
  • b) Dintrogen trioxide
  • c) Nitric oxide
  • d) Nitrogen peroxide
Q.14
Which of the following is most metallic ... { MP CET 1993]
  • a) P
  • b) As
  • c) Sb
  • d) Bi
Q.15
Mixture used for the tips of match stick is .. [ DPMT 1984]
  • a) S + K
  • b) Sb2S3
  • c) K2Cr2O7 + S + White P
  • d) K2Cr2O7 + K + S
Q.16
Which of the following is tetrabasic acid? [ CPMT 1988]
  • a) Orthophosphoric acid
  • b) Hypophosporoic acid
  • c) Metapphosphoric acid
  • d) Pyrophosphoric acid
Q.17
Phosphine is prepared by the action of .. {MP PMT 1988]
  • a) P and H2SO4
  • b) P and NaOH
  • c) P and HS
  • d) P and HNO3
Q.18
The maximum concentration of nitrogen is present in: [AFMC 2003]
  • a) nitrolim
  • b) calcium ammonium nitrate
  • c) ammonium sulphate
  • d) urea
Q.19
Which is the most reactive species of phosphorus? [AFMC 2003]
  • a) White
  • b) Red
  • c) Scarlet
  • d) Violet
Q.20
In aqua-regia the ratio of conc. HNO3 and conc. HCl present is : [2003]
  • a) 1 : 3
  • b) 3 : 1
  • c) 2 : 3
  • d) 3 : 2
Q.21
Which of the following is pyrophosphoric acid [ AIIMS 1987]
  • a) H3PO4
  • b) H4P2O7
  • c) H4P2O5
  • d) H3PO4
Q.22
Lapis lazuli is : [2004]
  • a) ferrous sulphate
  • b) copper sulphate
  • c) sodium aiuminosilicate
  • d) zinc sulphate
Q.23
Which of the following oxides of nitrogen is solid? [AFMC 2004]
  • a) NO2
  • b) N2O
  • c) N2O3
  • d) N2O5
Q.24
Nitrous oxide is known as : [2004]
  • a) breathing gas
  • b) laughing gas
  • c) exercising gas
  • d) laboratory gas
Q.25
A colourless gas with the smell of rotten fish is : [2005]
  • a) H2S
  • b) PH3
  • c) SO2
  • d) none of these
Q.26
Formula for tear gas is : [2005]
  • a) COCl2
  • b) CCl3NO2
  • c) N2 O
  • d) none of these
Q.27
A gas mixture contains O2 and N2 in the ratio of 1: 4 by weight. The ratio of their number of molecules is: [2006]
  • a) 1:8
  • b) 1:4
  • c) 3:16
  • d) 7:32
Q.28
Pure silicon doped with phosphorus is a: [2006]
  • a) metallic conductor
  • b) insulator
  • c) n-type semiconductor
  • d) p-type semiconductor
Q.29
A brown ring appears in the test for [2007]
  • a) nitrate
  • b) nitrite
  • c) bromide
  • d) iron
Q.30
Which of the following oxides of nitrogen is the anhydride of nitrous acid [AFMC 2007]
  • a) NO
  • b) N2O3
  • c) N2O4
  • d) N2O5
0 h : 0 m : 1 s