Q.1.
In the following reaction the product A is PCl5 + water → HCl + A [BVP pune 2002]
-
20%
a) H2P2O4
-
0%
b) H2P2O7
-
80%
c) H3PO4
-
0%
d) H3PO3
Q.2.
Of the following compounds, the most acidic is ... [ MP PMT 2002]
-
60%
a) As2O3
-
40%
b) P2O3
-
0%
c) Sb2O3
-
0%
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
-
25%
a) The basic strength of the hydrides increases
-
25%
b) Bond energies of M-H bonds increases
-
25%
c) Almost pure p-orbitals are used for M-H bonding
-
25%
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]
-
17%
a) Zero
-
17%
b) Two
-
50%
c) three
-
17%
d) four
Explanation
Q.5.
Which of the following comounds is explosive in nature? [ MPPMT 2001]
-
40%
a) Phosphrous trichloride
-
60%
b) Nitrogen trichloride
-
0%
c) Hyponitrous acid
-
0%
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]
-
0%
a) Dissimilar electronic configuration
-
75%
b) Larger size of phosphorus atom
-
25%
c) Reactivity of phosphorus
-
0%
d) Inert nature of nitrogen
Q.7.
Sodium pyrophosphate is .. [ CPMT 2003]
-
40%
a) Na2P2O7
-
40%
b) Na4P2O7
-
0%
c) Na3PO4
-
20%
d) Na2PO2
Q.8.
The three important oxidation states of phosphorus are .. [ Kerala MEE 2002]
-
75%
a) -3, +3 and +5
-
25%
b) -3, +3 and -5
-
0%
c) -3, +4 and -4
-
0%
d) -3, +3 and +4
Q.9.
Oxidation number of nitrogen is highest in .. [ j and K CEE 2003]
-
0%
a) N3H
-
50%
b) N2H4
-
0%
c) NH2OH
-
50%
d) NH3
Q.10.
Ionic radii of As3+, Sb3+,and Bi3+ follow the order ... [ EAMCET 2001]
-
25%
a) As3+ > Sb3+ > Bi3+
-
25%
b) Sb3+ > Bi3+ > As3+
-
25%
c) Bi3+ > As3+ > Sb3+
-
25%
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]
-
50%
a) -0.75, 1.25
-
0%
b) -3, 1.25
-
50%
c) -0.75, 1.0
-
0%
d) -0.75, 0.6
Q.12.
The nitride ion in in lithium nitride is composed of .. [ KCET 2000]
-
50%
a) 7 protons + 10 electrons
-
0%
b) 10 protons + 10 electrons
-
0%
c) 7 protons + 7 electrons
-
50%
d) 10 protons + 7 electrons
Q.13.
Most common material of phosphorus are [ Kerala MEE 2002]
-
0%
a) Hydroxyapatite and kernite
-
0%
b) Colemanite and fluorapatite
-
0%
c) Borax and fluorapatite
-
100%
d) Hydroxyapatite and fluorappatite
Q.14.
For H3PO3 and H3PO4, correct choice is? [ IIT screening test 2003]
-
0%
a) H3PO3 is diabasic and reducing
-
50%
b) H3PO3 is diabasic and non-reducing
-
0%
c) H3PO4 is tribasic and reducing
-
50%
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]
-
0%
a) Na3PO2
-
0%
b) Na3PO3
-
100%
c) NaH2PO2
-
0%
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]
-
0%
a) Non metallic character
-
50%
b) Inert pair effect
-
25%
c) High electronegativity
-
25%
d) Large ionization energy
Q.17.
What may be expected to happen when phosphine gas is mixed with chlorine gas [ AIEEE 2003]
-
25%
a) PCl3 and HCl are formed and the mixture warms up
-
25%
b) PCl5 and HCl are formed and the mixture cools down
-
25%
c) PH3.Cl2 is formed with worming up
-
25%
d) The mixture only cools down
Q.18.
Nitrogen shows different oxidation states in the range [ Kerala MEE 2003]
-
0%
a) 0 to +5
-
75%
b) -3 to +5
-
0%
c) -5 to +3
-
25%
d) +3 to +5
Q.19.
Nitrogen forms N2 but phosphorus is converted into P4 from Pthe reson for this is ... [ CBSE PMT 2001]
-
25%
a) Triple bond is present between phosphorus atoms
-
25%
b) pπ - pπ bonding is weak
-
0%
c) pπ - pπ bonding is strong
-
50%
d) Multiple bond is formed easily
Q.20.
The number of σ bonds in P4P10 is .. [ AIEEE 2002]
-
0%
a) 6
-
75%
b) 16
-
0%
c) 20
-
25%
d) 7
Explanation
Q.21.
Which element is used in the preparation of pesticides? .. [ GUJCET 2009]
-
25%
a) Arsenic
-
25%
b) Bismuth
-
25%
c) Antimony
-
25%
d) Nitrogen
Q.22.
Which of the following statements are true about P4O6 and P4O10
-
50%
a) Both gives H3PO3 and H3PO4 respectively
-
50%
b) Each P is combined with six O- atoms in P4O6 and each P with four O - atoms in P4O10
-
0%
c) Each P-atom is in the center of tetrahedral in both and possess four P-O-P bond structure
-
0%
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]
-
25%
a) Hypophosphrous acid
-
75%
b) Orthosphosphoric acid
-
0%
c) Pyrophosphoric acid
-
0%
d) Metaphosphoric acid
Q.24.
The oxidation number of As in H2AsO4- is ... [ CPMT 2001]
-
25%
a) +6
-
25%
b) +5
-
25%
c) -7
-
25%
d) +9
Q.25.
Which of the following pentafluorides can not be formed? [ J and K CEE 2003]
-
0%
a) PF5
-
50%
b) AsF5
-
0%
c) SbF5
-
50%
d) BiF5
Q.26.
Arrange the following in order of increasing acidity H3PO4 , H2CO3 , HCl, HI
-
25%
a) H3PO4, HCl, H2CO3, HI
-
25%
b) H3PO4, H2CO3, HCl,HI
-
0%
c) H2CO3,H3PO4, HCl,HI
-
50%
d) None of these
Q.27.
One of the oxidants used with liquid propellants is .. [ kerala MEE 2001]
-
0%
a) Ammmonium perchlorate
-
0%
b) Nitrocellulose
-
25%
c) Phosphorous pentoxide
-
75%
d) Nitrogen tetroxide ( N2O4)
Q.28.
Which of the following element is most metallic? [ MPPMT 2002]
-
33%
a) P
-
0%
b) As
-
33%
c) Sb
-
33%
d) Bi
Q.29.
he true statement for the acids of phosphorus H3PO2 , H3PO3 and H3PO4 is .. [ AIIMS 2003]
-
25%
a) The order of their acidity is H3PO4 > H3PO3 > H3PO2
-
25%
b) All of them are reducing in nature
-
0%
c) All of them are tribasic acids
-
50%
d) The geometry of phosphorus is tetrahedral in all three
Q.30.
Which of the following compound does not exists
-
0%
a) AsCl5
-
25%
b) SbCl3
-
25%
c) BiCl5
-
50%
d) SbCl5