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NEET Chemistry MCQ
Nitrogen Family Mcq Neet Chemistry
Quiz 5
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Q.1
In the following reaction the product A is PCl5 + water → HCl + A [BVP pune 2002]
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a) H2P2O4
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b) H2P2O7
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c) H3PO4
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d) H3PO3
Explanation
Answer: (c)
Q.2
Of the following compounds, the most acidic is ... [ MP PMT 2002]
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a) As2O3
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b) P2O3
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c) Sb2O3
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d) Bi2O3
Explanation
Pentaoxides are more acidic than trioxides and acidic nature decreases down the group from N to Bi Answer:(b)
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
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a) The basic strength of the hydrides increases
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b) Bond energies of M-H bonds increases
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c) Almost pure p-orbitals are used for M-H bonding
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d) The bond pairs of electrons become nearer to the central atom
Explanation
As we go down the bonded pairs goes' farther apart from the central atom. this suggest that orbitals used for bonding are closer to pure p orbitals. And angle becomes closer to 90° Answer: (c)
Q.4
The number of P-O-P bonds in cyclic metaphosphoric acid is .. [ IIT screening test 2000]
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a) Zero
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b) Two
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c) three
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d) four
Explanation
Cyclic metaphosphoric acid (HPO3)3 which contains three P-O-P bonds Answer: (c)
Q.5
Which of the following comounds is explosive in nature? [ MPPMT 2001]
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a) Phosphrous trichloride
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b) Nitrogen trichloride
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c) Hyponitrous acid
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d) Nitrosyl chloride
Explanation
Answer: (b)
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]
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a) Dissimilar electronic configuration
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b) Larger size of phosphorus atom
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c) Reactivity of phosphorus
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d) Inert nature of nitrogen
Explanation
Due to large size of P, it have d-orbitals and show +5 oxidation state which is more stable than N Answer:(b)
Q.7
Sodium pyrophosphate is .. [ CPMT 2003]
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a) Na2P2O7
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b) Na4P2O7
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c) Na3PO4
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d) Na2PO2
Explanation
Answer: (b)
Q.8
The three important oxidation states of phosphorus are .. [ Kerala MEE 2002]
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a) -3, +3 and +5
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b) -3, +3 and -5
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c) -3, +4 and -4
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d) -3, +3 and +4
Explanation
There important oxidation states of P are -3 in PH3, +3 in P2O3 and +5 in P2O5 Answer: (a)
Q.9
Oxidation number of nitrogen is highest in .. [ j and K CEE 2003]
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a) N3H
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b) N2H4
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c) NH2OH
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d) NH3
Explanation
Oxidation number of N in N3H is -1/3 which is lowest negative number Answer: (a)
Q.10
Ionic radii of As3+, Sb3+,and Bi3+ follow the order ... [ EAMCET 2001]
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a) As3+ > Sb3+ > Bi3+
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b) Sb3+ > Bi3+ > As3+
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c) Bi3+ > As3+ > Sb3+
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d) Bi3+ > Sb3+ > As3+
Explanation
Down the group ionic radii increases Answer:(d)
Q.11
In PO43- ion, the formal charge on each oxygen atom and P - O bond order respectively are ... [ CBSE PMT 1998]
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a) -0.75, 1.25
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b) -3, 1.25
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c) -0.75, 1.0
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d) -0.75, 0.6
Explanation
Four oxygen have total formal charge = -3 One oxygen have formal charge = -3/4 = -0.75 Total P - O bonds in PO43- ion = 5 Therefore , p - O bond order = 5/4 = 1.25 Answer: (a)
Q.12
The nitride ion in in lithium nitride is composed of .. [ KCET 2000]
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a) 7 protons + 10 electrons
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b) 10 protons + 10 electrons
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c) 7 protons + 7 electrons
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d) 10 protons + 7 electrons
Explanation
N3- ion has 7 protons and 7+3 = 10 electrons Answer: (a)
Q.13
Most common material of phosphorus are [ Kerala MEE 2002]
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a) Hydroxyapatite and kernite
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b) Colemanite and fluorapatite
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c) Borax and fluorapatite
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d) Hydroxyapatite and fluorappatite
Explanation
Answer: (d)
Q.14
For H3PO3 and H3PO4, correct choice is? [ IIT screening test 2003]
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a) H3PO3 is diabasic and reducing
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b) H3PO3 is diabasic and non-reducing
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c) H3PO4 is tribasic and reducing
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d) H3PO3 is tribasic and non-reducing
Explanation
H3PO3 contains Two P-OH units thus dibasic and reducing Answer:(a)
Q.15
The correct formula of salt formed by the neutralization of hypophosphorus acid with NaOH i [ GUJCET 2007]
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a) Na3PO2
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b) Na3PO3
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c) NaH2PO2
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d) Na2HPO2
Explanation
hypophosphorus is mono protic acid Answer: (c)
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]
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a) Non metallic character
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b) Inert pair effect
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c) High electronegativity
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d) Large ionization energy
Explanation
Due to inert pair effect +5 oxidation state becomes less stable and +3 oxidation state becomes more stable down the group Answer: (b)
Q.17
What may be expected to happen when phosphine gas is mixed with chlorine gas [ AIEEE 2003]
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a) PCl3 and HCl are formed and the mixture warms up
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b) PCl5 and HCl are formed and the mixture cools down
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c) PH3.Cl2 is formed with worming up
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d) The mixture only cools down
Explanation
PH3 + 3Cl2 → PCl3 + 3HCl ( exothermic reaction) Answer:(a)
Q.18
Nitrogen shows different oxidation states in the range [ Kerala MEE 2003]
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a) 0 to +5
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b) -3 to +5
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c) -5 to +3
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d) +3 to +5
Explanation
Answer: (b)
Q.19
Nitrogen forms N2 but phosphorus is converted into P4 from Pthe reson for this is ... [ CBSE PMT 2001]
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a) Triple bond is present between phosphorus atoms
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b) pπ - pπ bonding is weak
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c) pπ - pπ bonding is strong
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d) Multiple bond is formed easily
Explanation
In case of phosphorous pπ - pπ bond is very weak and thus p2 is unstable Answer: (b)
Q.20
The number of σ bonds in P4P10 is .. [ AIEEE 2002]
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a) 6
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b) 16
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c) 20
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d) 7
Explanation
In P4O10 there are 16 sigma bonds and four π bonds Answer: (b)
Q.21
Which element is used in the preparation of pesticides? .. [ GUJCET 2009]
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a) Arsenic
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b) Bismuth
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c) Antimony
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d) Nitrogen
Explanation
Answer:(a)
Q.22
Which of the following statements are true about P4O6 and P4O10
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a) Both gives H3PO3 and H3PO4 respectively
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b) Each P is combined with six O- atoms in P4O6 and each P with four O - atoms in P4O10
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c) Each P-atom is in the center of tetrahedral in both and possess four P-O-P bond structure
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d) All P-O bonds are similar in both of them
Explanation
Answer: (a)
Q.23
The oxyacid of phosphorus in which phosphorus has lowest oxidation state is ... [ EAMCET 1999]
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a) Hypophosphrous acid
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b) Orthosphosphoric acid
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c) Pyrophosphoric acid
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d) Metaphosphoric acid
Explanation
in Hypophosphrous acid ( H3PO2) contains P in +1 oxidation state Answer: (a)
Q.24
The oxidation number of As in H2AsO4- is ... [ CPMT 2001]
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a) +6
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b) +5
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c) -7
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d) +9
Explanation
2+ x -8 = -1 x = +5 Answer: (b)
Q.25
Which of the following pentafluorides can not be formed? [ J and K CEE 2003]
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a) PF5
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b) AsF5
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c) SbF5
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d) BiF5
Explanation
Due to inert pair effect in Bi +5 oxidation state is less stable than +3 Answer:(d)
Q.26
Arrange the following in order of increasing acidity H3PO4 , H2CO3 , HCl, HI
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a) H3PO4, HCl, H2CO3, HI
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b) H3PO4, H2CO3, HCl,HI
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c) H2CO3,H3PO4, HCl,HI
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d) None of these
Explanation
Answer: (c)
Q.27
One of the oxidants used with liquid propellants is .. [ kerala MEE 2001]
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a) Ammmonium perchlorate
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b) Nitrocellulose
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c) Phosphorous pentoxide
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d) Nitrogen tetroxide ( N2O4)
Explanation
Answer: (d)
Q.28
Which of the following element is most metallic? [ MPPMT 2002]
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a) P
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b) As
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c) Sb
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d) Bi
Explanation
Down the group metallic character increases Answer: (d)
Q.29
he true statement for the acids of phosphorus H3PO2 , H3PO3 and H3PO4 is .. [ AIIMS 2003]
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a) The order of their acidity is H3PO4 > H3PO3 > H3PO2
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b) All of them are reducing in nature
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c) All of them are tribasic acids
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d) The geometry of phosphorus is tetrahedral in all three
Explanation
Answer:(d)
Q.30
Which of the following compound does not exists
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a) AsCl5
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b) SbCl3
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c) BiCl5
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d) SbCl5
Explanation
Due to inert pair effect in Bi , BiCl5 does not exists Answer: (c)
0 h : 0 m : 1 s
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