Q.1
In the following reaction the product A is PCl5 + water → HCl + A [BVP pune 2002]
  • a) H2P2O4
  • b) H2P2O7
  • c) H3PO4
  • d) H3PO3
Q.2
Of the following compounds, the most acidic is ... [ MP PMT 2002]
  • a) As2O3
  • b) P2O3
  • c) Sb2O3
  • d) Bi2O3
Q.3
In nitrogen family, the H-M-H bond angle in the hydrides gradually becomes closer to 90° on going from N to Sb. This shows that gradually
  • a) The basic strength of the hydrides increases
  • b) Bond energies of M-H bonds increases
  • c) Almost pure p-orbitals are used for M-H bonding
  • d) The bond pairs of electrons become nearer to the central atom
Q.4
The number of P-O-P bonds in cyclic metaphosphoric acid is .. [ IIT screening test 2000]
  • a) Zero
  • b) Two
  • c) three
  • d) four
Q.5
Which of the following comounds is explosive in nature? [ MPPMT 2001]
  • a) Phosphrous trichloride
  • b) Nitrogen trichloride
  • c) Hyponitrous acid
  • d) Nitrosyl chloride
Q.6
Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group. This is due to ... [ KCET 2002]
  • a) Dissimilar electronic configuration
  • b) Larger size of phosphorus atom
  • c) Reactivity of phosphorus
  • d) Inert nature of nitrogen
Q.7
Sodium pyrophosphate is .. [ CPMT 2003]
  • a) Na2P2O7
  • b) Na4P2O7
  • c) Na3PO4
  • d) Na2PO2
Q.8
The three important oxidation states of phosphorus are .. [ Kerala MEE 2002]
  • a) -3, +3 and +5
  • b) -3, +3 and -5
  • c) -3, +4 and -4
  • d) -3, +3 and +4
Q.9
Oxidation number of nitrogen is highest in .. [ j and K CEE 2003]
  • a) N3H
  • b) N2H4
  • c) NH2OH
  • d) NH3
Q.10
Ionic radii of As3+, Sb3+,and Bi3+ follow the order ... [ EAMCET 2001]
  • a) As3+ > Sb3+ > Bi3+
  • b) Sb3+ > Bi3+ > As3+
  • c) Bi3+ > As3+ > Sb3+
  • d) Bi3+ > Sb3+ > As3+
Q.11
In PO43- ion, the formal charge on each oxygen atom and P - O bond order respectively are ... [ CBSE PMT 1998]
  • a) -0.75, 1.25
  • b) -3, 1.25
  • c) -0.75, 1.0
  • d) -0.75, 0.6
Q.12
The nitride ion in in lithium nitride is composed of .. [ KCET 2000]
  • a) 7 protons + 10 electrons
  • b) 10 protons + 10 electrons
  • c) 7 protons + 7 electrons
  • d) 10 protons + 7 electrons
Q.13
Most common material of phosphorus are [ Kerala MEE 2002]
  • a) Hydroxyapatite and kernite
  • b) Colemanite and fluorapatite
  • c) Borax and fluorapatite
  • d) Hydroxyapatite and fluorappatite
Q.14
For H3PO3 and H3PO4, correct choice is? [ IIT screening test 2003]
  • a) H3PO3 is diabasic and reducing
  • b) H3PO3 is diabasic and non-reducing
  • c) H3PO4 is tribasic and reducing
  • d) H3PO3 is tribasic and non-reducing
Q.15
The correct formula of salt formed by the neutralization of hypophosphorus acid with NaOH i [ GUJCET 2007]
  • a) Na3PO2
  • b) Na3PO3
  • c) NaH2PO2
  • d) Na2HPO2
Q.16
Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalency becomes less pronounced and trivalency becomes more pronounced due to ... [ Tamilnadu CET 2001]
  • a) Non metallic character
  • b) Inert pair effect
  • c) High electronegativity
  • d) Large ionization energy
Q.17
What may be expected to happen when phosphine gas is mixed with chlorine gas [ AIEEE 2003]
  • a) PCl3 and HCl are formed and the mixture warms up
  • b) PCl5 and HCl are formed and the mixture cools down
  • c) PH3.Cl2 is formed with worming up
  • d) The mixture only cools down
Q.18
Nitrogen shows different oxidation states in the range [ Kerala MEE 2003]
  • a) 0 to +5
  • b) -3 to +5
  • c) -5 to +3
  • d) +3 to +5
Q.19
Nitrogen forms N2 but phosphorus is converted into P4 from Pthe reson for this is ... [ CBSE PMT 2001]
  • a) Triple bond is present between phosphorus atoms
  • b) pπ - pπ bonding is weak
  • c) pπ - pπ bonding is strong
  • d) Multiple bond is formed easily
Q.20
The number of σ bonds in P4P10 is .. [ AIEEE 2002]
  • a) 6
  • b) 16
  • c) 20
  • d) 7
Q.21
Which element is used in the preparation of pesticides? .. [ GUJCET 2009]
  • a) Arsenic
  • b) Bismuth
  • c) Antimony
  • d) Nitrogen
Q.22
Which of the following statements are true about P4O6 and P4O10
  • a) Both gives H3PO3 and H3PO4 respectively
  • b) Each P is combined with six O- atoms in P4O6 and each P with four O - atoms in P4O10
  • c) Each P-atom is in the center of tetrahedral in both and possess four P-O-P bond structure
  • d) All P-O bonds are similar in both of them
Q.23
The oxyacid of phosphorus in which phosphorus has lowest oxidation state is ... [ EAMCET 1999]
  • a) Hypophosphrous acid
  • b) Orthosphosphoric acid
  • c) Pyrophosphoric acid
  • d) Metaphosphoric acid
Q.24
The oxidation number of As in H2AsO4- is ... [ CPMT 2001]
  • a) +6
  • b) +5
  • c) -7
  • d) +9
Q.25
Which of the following pentafluorides can not be formed? [ J and K CEE 2003]
  • a) PF5
  • b) AsF5
  • c) SbF5
  • d) BiF5
Q.26
Arrange the following in order of increasing acidity H3PO4 , H2CO3 , HCl, HI
  • a) H3PO4, HCl, H2CO3, HI
  • b) H3PO4, H2CO3, HCl,HI
  • c) H2CO3,H3PO4, HCl,HI
  • d) None of these
Q.27
One of the oxidants used with liquid propellants is .. [ kerala MEE 2001]
  • a) Ammmonium perchlorate
  • b) Nitrocellulose
  • c) Phosphorous pentoxide
  • d) Nitrogen tetroxide ( N2O4)
Q.28
Which of the following element is most metallic? [ MPPMT 2002]
  • a) P
  • b) As
  • c) Sb
  • d) Bi
Q.29
he true statement for the acids of phosphorus H3PO2 , H3PO3 and H3PO4 is .. [ AIIMS 2003]
  • a) The order of their acidity is H3PO4 > H3PO3 > H3PO2
  • b) All of them are reducing in nature
  • c) All of them are tribasic acids
  • d) The geometry of phosphorus is tetrahedral in all three
Q.30
Which of the following compound does not exists
  • a) AsCl5
  • b) SbCl3
  • c) BiCl5
  • d) SbCl5
0 h : 0 m : 1 s