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NEET Chemistry MCQ
Nitrogen Family Mcq Neet Chemistry
Quiz 3
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Q.1
Which of the following is a cyclic phosphate [ Haryana CEET 1196]
0%
a) H3P3O10
0%
b) H6P4O13
0%
c) H5P5O15
0%
d) H7P5O16
Explanation
metaphosphate have cyclic structure with general formula (HPO3)n Answer: (c)
Q.2
What may be expected to happen when phosphine gas is mixed with Hydrogen chloride gas[ AIEEE 2003]
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a) The mixture only cools down
0%
b) PCl3 and HCl are formed and the mixture warms up
0%
c) PCl5 and HCl are formed and mixture cools down
0%
d) PH4.Cl is formed with warming up
Explanation
PH3 + HCl → PH4Cl Answer: (d)
Q.3
On adding excess of ammonium hydroxide to a copper chloride solution. [MH CET 1999]
0%
a) A deep blue solution is obtained
0%
b) No change is observed
0%
c) Blue precipitate of copper hydroxide is obtained
0%
d) Black precipitate of copper oxide is obtained
Explanation
On adding excess of ammonium hydroxide to a copper chloride solution a deep blue solution of [Cu(NH3)4]2+ion is formed. Answer:(a)
Q.4
Phosphine is produced by adding water to [ KCET 1991]
0%
a) CaC2
0%
b) HPO3
0%
c) Ca3P2
0%
d) P4P10
Explanation
Ca3P2 → 2PH3 + 3Ca(OH)2 Answer: (c)
Q.5
The brown ring test for NO2- and NO3- is due to the formation of complex ion with a formula [ KCET 2000]
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a) [ Fe(H2O)5NO ]2+
0%
b) Mg3N2
0%
c) NH3
0%
d) MgO
Explanation
Answer: (a)
Q.6
The P-P-P bond angle in white phosphorus is [ MPCET 1991]
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a) 120°
0%
b) 109° 28'
0%
c) 90°
0%
d) 60°
Explanation
Four atoms pf P4 white phosphorous molecule occupy corners of regular tetrahedron so P-P-P bond angle is 60° Answer: (d)
Q.7
The acid which forms two series of salt [ haryana CEET 1995]
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a) H3PO4
0%
b) H3PO3
0%
c) H3BO3
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d) H3PO2
Explanation
H3PO3 is dibasic and form two series of salts Answer:(b)
Q.8
Which one of following substance has highest proton affinity [ AIEEE 2003 ]
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a) H2O
0%
b) H2S
0%
c) NH3
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d) PH3
Explanation
NH3 has most easily available lone pair and hence shows great proton affinity Answer: (c)
Q.9
NH3 and BF3 form an adduct readily because thy form [ KCET 2000]
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a) A coordinate bond
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b) A hydrogen bond
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c) An ionic bond
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d) A covalent bond
Explanation
NH3 has a lone pair of electron and BF3 is electron deficient compound thus coordinate bond formation occurs between NH3 and BF3 to form adduct NH3 → BF3 Answer: (a)
Q.10
The correct sequence of decreases in the bond angle of the following hydrides is [ MPCET 2002]
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a) NH3 > PH3 > AsH3 > SbH3
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b) NH3 > AsH3 > PH3 > SbH3
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c) SbH3 > AsH3 > PH3 > NH3
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d) PH3 > NH3 > AsH3 > SbH3
Explanation
Due to decrease in electronagtivity Bond angle of group 15 element Hydrides follows the order NH3 > PH3 > AsH3 > SbH3Answer: (a)
Q.11
Which of the following compound is not known ..[MP PMT 1988]
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c) NCl5
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a) NCl3
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b) NI3
0%
d) SbCl3
Explanation
Oxidation state of N can not be +5 due to non availability of d-orbital Answer:(c)
Q.12
P - O - P bond is present in
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a) H4P2O7
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b) H4P2O5
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c) Both (a) and (b)
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d) None of the these
Explanation
Answer: (c)
Q.13
Which of the following fluoride does not exist? [ MPCET 1993 ]
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a) NF5
0%
b) PF5
0%
c) AsF5
0%
d) SbF5
Explanation
Nitrogen can not show pentavalency Answer: (a)
Q.14
Brown colour in HNO3 can be removed by
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a) Adding Mg power
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b) Boiling the acid
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c) Passing HN3 through acid
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d) Passing air through warm acid
Explanation
Answer: (d)
Q.15
Read P can be obtained white P by [ Kernataka CET 1989]
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a) Heating in an atmosphere
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b) Distilling it in a inert atmosphere
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c) Dissolving it in CS2 and crystallizing
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d) Melting it and pouring the liquid into water
Explanation
Heat red P in inert atomsphere at 240-250°C Answer:(a)
Q.16
metal X on heating in nitrogen gas gives Y, Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives blue colour, Y is
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a) Mg(NO3)2
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b) Mg3N2
0%
c) NH3
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d) MgO
Explanation
3Mg + N2 → Mg3N2 Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3 4NH3 + CuSO4 → [ Cu(NH3)4 ] SO4 ( is of blue colour) Answer: (b)
Q.17
Which of the following has highest dipole moment? [ Haryana CEET 2000]
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a) NH3
0%
b) PH3
0%
c) AsH3
0%
d) SbH3
Explanation
Dipole moment of group 15 hydrides decreases down the group due to decrease in electronegativity from N to Bi. Thus NH3 has highest dipole moment Answer: (a)
Q.18
When ammonia is passed over heated copper oxide, the metallic copper is obtained. the reaction shows that ammonia is [ MPCET 2002]
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a) A dehydrating agent
0%
b) An oxidizing agent
0%
c) A reducing agent
0%
d) A nitrating agent
Explanation
Answer: (c)
Q.19
Group 15 of the periodic table consists of the element N, P, As, Sb, and Bi. On passing from N to Bi, the oxides of the elements of general formula M2O3 become
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a) Stronger reducing agents
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b) More ionic
0%
c) More basic
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d) More volatile
Explanation
Basic character of the of oxides of group 15 element increases down the group Answer:(c)
Q.20
Which oxide does not acts as reducing agent ? [ MPCET 1990]
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a) NO
0%
b) NO2
0%
c) N2O
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d) N2O5
Explanation
N2O5 has nitrogen in +5 oxidation state. Nitrogen can't acquire oxidation number higher than +5 and thus can't act as reducing agent but act as strong strong oxidising agent Answer: (d)
Q.21
Which of the following is used as fertilizer? [ CPMT 1998]
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a) CaC2
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b) NaAlO2
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c) Ca(H2PO4)2 . H2O +CaSO4
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d) All the three
Explanation
Answer: (c)
Q.22
In modern process, white phosphorus is manufactured by .. [ CPMT 1994]
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a) Heating a mixture of phosphorite mineral with sand and coke in an electric furnace
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b) Heating calcium phosphate with lime
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c) Heating bone ash with coke
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d) Heating phosphate mineral with sand
Explanation
2Ca3(PO4)2 + 6caSiO3 → 6CaSiO3 + P4P10 P4O10 + 10C → P4 + 10CO Answer: (a)
Q.23
When excess of water is added to BiCl3 solution .. [ AFMC 1994]
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a) Ionization of BiCl3 is increased
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b) A white ppt of Bi(OH)3 is obtained
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c) BiCl3 is hydrolysed to give white ppt of BiOCl
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d) BiCl3 is precipitated
Explanation
BiCl3 + H2O → 2Hcl + BiOCl ( white ppt) Answer:(c)
Q.24
Which of the following is a cyclic phosphate? [ Haryana CEET 1996]
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a) H3P3O10
0%
b) H6P4O13
0%
c) H5P5O15
0%
d) H2P5O16
Explanation
H5P5O15 is metaphosphoric acid which is pentameric . (HPO3) and will give cyclic phosphate Answer: (c)
Q.25
Phosphine is not obtained by the reaction when ... [ MP PMT 1989]
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a) White P is heated with NaOH
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b) Red P is heated with NaOH
0%
c) Ca3P2
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d) P4O6 is boiled with water
Explanation
Red P does not react with NaOH. Only white P reacts with NaOH or KOH to form PH3 Answer: (b)
Q.26
Aqueous solution of ammonia consist of .. [ CBSE PMT 1991]
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a) H+
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b) OH-
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c) NH4+
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d) NH4+ and OH-
Explanation
Answer: (d)
Q.27
Phosphrous pentaoxide find use as .. { BHU 1993]
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a) An oxidising agent
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b) A reducing agent
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c) A bleaching agent
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d) A dehydrating agent
Explanation
Answer:(d)
Q.28
Which of the following has least covalent [ CPMT 1996]
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a) PH3
0%
b) P2H62+
0%
c) P3H5+
0%
d) PH4+
Explanation
The formal charge distributed on each P -H bond is P2H6+2 = +2/6 = +0.33; On each P-H bond in P3P5+ = +1/5 = +0.2 On each P-H bond in PH4+ = +1/4 = +0.25. Therefore, the least covalent P_H bond present in P2H62+ Answer: (b)
Q.29
EAch of the following is true of white and red phosphorus except that they ... [ CBSE PMT 1989]
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a) Are both soluble in CS2
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b) Can be oxidised by heating in air
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c) Consist of the same kind of atom
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d) Can be converted into one another
Explanation
Only white P is soluble in CS2 Answer: (a)
Q.30
In P4O6 number of oxygen atoms bonded to each phosphorous atom is ... [MP PMT 1995]
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a) 1.5
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b) 2
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c) 3
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d) 4
Explanation
Each P is bonded with three O atoms Answer: (c)
0 h : 0 m : 1 s
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