Group 15 of the periodic table consists of the elements N, P, As, Sb and Bi. On passing from N to Bi, the oxides of the elements of general formula M2O3 becomes... [ DEC1994]
0%
a) Stronger reducing agent
0%
b) More ionic
100%
c) More basic
0%
d) More volatile
Q.2.
The sides of match box have coating of .. [ BHU 1995]
0%
a) Potassium chloride and red lead
33%
b) Potassium chlorate and antimony sulphide
67%
c) Antimony sulphide and red phosphorus
0%
d) Antimony sulphide and red lead
Q.3.
White P when boiled with strong solution of caustic soda produces.. { CPMT 1989]
67%
a) Phosphine
33%
b) Posh acid
0%
c) Phosphorous acid
0%
d) none
Q.4.
Which of the following reacts rapidly with oxygen in air at ordinary temperature
33%
a) White P
67%
b) Red P
0%
c) N2
0%
d) N2O
Q.5.
The sequence of acidic character is .. [ CPMT 1993]
0%
a) SO2 > CO2 > CO > N2O5
33%
b) SO2 >N2O5 > CO > CO2
0%
c) N2O5 > SO2 > CO > CO2
67%
d) N2O5 > SO2 > CO2 >CO
Q.6.
Among the following oxides, the least acidic is ... [ CBSE PMT1996]
0%
a) P4O6
100%
b) P4O10
0%
c) As4O6
0%
d) AS4O10
Q.7.
When orthophosphoric acid is heated to 600°C, the product formed is ... [ CBSE PMT 1989]
0%
a) PH3
67%
b) P2O5
33%
c) H3PO3
0%
d) HPO3
Q.8.
Amongst the following elements ( whose electronic configurations are given below), the one having the highest ionization energy is [ IIT 1990]
0%
a) Ne]3s2 3p1
33%
b) [Ne] 3s2 3p3
33%
c) [Ne] 3s23p2
33%
d) [Ar] 3d10 4s2 4p3
Q.9.
Structure of white phosphorus is ... [ BHU 1994]
0%
a) Square planar
0%
b) Pyramidal
67%
c) Tetrahedral
33%
d) Trigonal planar
Q.10.
Among the following species, identify the isostructureal pairs... [ IIT 1996] NF3, NO3- , BF3 H3O+, HN3
0%
a) [NF3,NO3-] and [ BF3, H3O+]
0%
b) [NF3, HN3] and [NO3-, BF3]
100%
c) [NF3, H3O+] and [NO3-, BF3]
0%
d) [NF3, H3O+] and [HN3,BF3]
Q.11.
Red P can be obtain form white P by .. [ KCET 1989]
67%
a) Heating it with a catalyst in an inert atmosphere
0%
b) Distilling it in an inert atmospheres
33%
c) Dissolving it an inert atmosphere
0%
d) Melting and pouring liquid in to water
Q.12.
Phosphine is produced by adding water to .. [KCET 1991]
0%
a) CaC2
33%
b) HPO3
67%
c) Ca3P2
0%
d) P4O10
Q.13.
The element with the highest first ionization potential is [ Roorkee Screening test 1993]
0%
a) Boron
33%
b) Carbon
67%
c) Nitrogen
0%
d) Oxygen
Q.14.
P2O5 is used extensively as a [BVP 2003]
0%
a) Reducing agent
33%
b) Oxidising agent
33%
c) Dehydrating agent
33%
d) Preservative
Q.15.
Which is not an acid salt? [ MLNR 1989]
0%
a) NaH2PO3
0%
b) NaH2PO2
100%
c) Na3HP2O6
0%
d) Na4P2O7
Q.16.
the oxidation state of phosphorus in Ba(H2PO2)2 is ... { IIT 1990]
0%
a) +3
33%
b) +2
33%
c) +1
33%
d) -1
Q.17.
Which of the following is amphotoric? [ Haryana CEET 1994]
0%
a) CO2
33%
b) Sb2O3
0%
c) MgO
67%
d) Mn2O3
Q.18.
Which of the following halides is the most acidic? [ Haryana CEET 1996]
67%
a) PCl3
0%
b) SbCl3
33%
c) BiCl3
0%
d) CCl4
Q.19.
When aluminium phosphide is treated with dil. sulphuric acid.. [ KCET 1989]
67%
a) SO2 is liberated
0%
b) PH3 is evolved
0%
c) H2S is evolved
33%
d) H2 is evolved
Q.20.
P2O5 is heated with water to give .. [ CBSE PMT 1991]
0%
a) Hypophosphrous acid
33%
b) Phosphorous acid
33%
c) Hypohosphoric acid
33%
d) Orthophosphoric acid
Q.21.
Bcl3 is planar molecule where as NCl3 is pyramidal because .. [ CBSE PMT 1995]
67%
a) BCl3 ha no lone pair of electrons but NC3 has a lone pair
0%
b) B - Cl bond is more planer than N - Cl bond
33%
c) Nitrogen atom is smaller than boron atom
0%
d) N - Cl bond is more covalent than B- Cl bond
Q.22.
Phosphide ion has the electronic structure similar to that of .. [ CPMT 1988]
33%
a) Nitride ion
0%
b) Fluoride ion
67%
c) Sodium ion
0%
d) Chloride ion
Q.23.
There is very little difference in acid strength in the series H3PO4, H3PO3 and H3PO2 because
0%
a) Phosphorus in these acid exists in different oxidation states
100%
b) Number of unprotonated oxygen responsible for increase of acidity due to inductive effect remains the same
0%
c) Phosphorus is not a highly electronegative element
0%
d) Phosphorus oxides are less electronegative element
Q.24.
Constitution of superphosphate is .. [ COPMT1993]
33%
a) Gypsum and calcium dihydrogen phosphate
0%
b) Gypsum and calcium phosphate
67%
c) Gypsum and H3P4
0%
d) Calcium phosphate and H3PO4
Q.25.
In the P3-, S2- and Cl- ions the increasing order of size is ... [ AIIMS 1996]
67%
a) Cl- < S2- < P3-
0%
b) P3- < S2- < Cl-
0%
c) S2- < Cl- < P3-
33%
d) S2- < P3- < Cl-
Q.26.
Which of the following oxides will be least acidic? [ MP PMT 1990]
0%
a) P4O6
33%
b) P4O10
67%
c) As2O6
0%
d) As4O10
Q.27.
CN- ion and N2 are isoelectronic but in contrast to CN-, N2 is chemically inert because ... [ IIT1992]
0%
a) Low bond energy
67%
b) Absence of bond polarity
0%
c) Unsymmetrical electron distribution
33%
d) Presence of more number of electrons in bonding orbitals
Q.28.
By action of hot conc. H2SO4, phosphorus changes to [ Roorkee Screening test 1992]
0%
a) Phosphorous acid
67%
b) Orthophosphoric acid
0%
c) Metaphosphoric acid
33%
d) Pyrophosphoric acid
Q.29.
The most acidic of the following compounds is .. [ Bihar CEE 1995]
33%
a) P2O3
33%
b) Sb2O3
0%
c) B2O3
33%
d) As2O3
Q.30.
Which of the following is an oxyacid?
0%
a) Ba(OH)2
50%
b) Mg(OH)2
25%
c) H3PO3
25%
d) HCl
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