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NEET Chemistry MCQ
Nitrogen Family Mcq Neet Chemistry
Quiz 2
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Q.1
The electronegativity of the following elements increases in the order .. [ IIT 1987]
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a) C, N, Si, P
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b) N, Si, C, P
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c) Si, P, C, N
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d) P, Si, N, C
Explanation
electro negativity increases from left to right in period and increases from bottom to top in group thus option (c) is correct Answer: (c)
Q.2
Hydrolysis of NCl3 gives NH3 and X, Which of the following is X?[AFMC 2008]
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a) HClO4
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b) HClO3
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c) HOCl
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d) HClO2
Explanation
Complete reaction is NCl3 + 3H3O→ NH3 + 3HClO ( is X) Answer: (c)
Q.3
The brown ring test for nitrates depends on [AFMC 2008]
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a) the reduction of nitrate to nitric oxide
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b) oxidation of nitric oxide to nitrogen dioxide
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c) reduction of ferrous sulphate to iron
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d) oxidising action of sulphuric acid
Explanation
Brown ring is formed during the test is due to formation of [Fe(NO)]SO4 It detect the presence of Nitrate. Thus nitrate(NO3-) ion is reduced to nitric oxide. Oxidation state of N is changed from +5 to +2 Answer: (a)
Q.4
Which acid has P - P linkage? [AFMC 2009]
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a) Hypophosphoric acid
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b) Pyrophosphoric acid
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c) Metaphosphoric acid
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d) Orthophosphoric acid
Explanation
Structures are as follows From above it is clear P-P bond exists only in Hypophosphoric acid Answer: (a)
Q.5
Which of the following element occurs free in nature? [ CPMT 1988]
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a)N
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b) P
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c) As
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d) Sb
Explanation
Answer: (a)
Q.6
hich of the following element shows oxidation state + 1 to + 5 in its oxide? [2010]
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a) N
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b) P
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c) As
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d) F
Explanation
Possible oxidation states for F is -1 For As is +5,-3 For P is +5 and 3 For N is 1 to +5 Answer: (a)
Q.7
PbO2 on reaction with cone. HNO3 gives [2010]
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a) PbNO2 + O2
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b) Pb(N03)2 + H2O+ ½(O2 )
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c) Pb+N2+H2O
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d) Pb(OH)2 + NO
Explanation
complete reaction is PbO2 + HNO3 → Pb(NO3)2 + H2O + ½(O2) Answer: (b)
Q.8
Urea is preferred to ammonium sulphate as a nitrogenous fertilizer because: [2010]
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a) it is more soluble in water
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b) it is cheaper than ammonium sulphate
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c) it is quite stable
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d) it does not cause acidity in the soil
Explanation
Urea is preferred to ammonium sulphate as nitrogenous fertilizer because it does not cause acidity in soil Answer : (d)
Q.9
In nitrogen family, the H-M-H bond angle in the hydrides gradually becomes closer to 90째 on going from N to Sb. This shows that gradually [2011]
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a) The basic strength of the hydrides increases
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b) Almost pure p-orbitals are used for M-H bonding
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c) The bond energies of H-M-H bonds increase
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d) The bond pairs of electrons become nearer to the central atom.
Explanation
From S to Sb electrons get filled in same orbit Therefore due to bonded electron repulsion H-M-H angle becomes closer to 90O Answer: (b)
Q.10
Phosphorus is manufactured by heating in a furnace
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a) Bone ash, sodium chloride and coke
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b) Bone ash, silica and coke
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c) Bone ash, silica and lime
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d) Bone ash, coke and lime stone
Explanation
Answer : (b)
Q.11
Which of the following does not belong to p-block element ( GUJCET 2008)
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a) Sr
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b) Po
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c) As
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d) Ga
Explanation
Sr is s-block element Answer: (a)
Q.12
The most stable hydride is .. [EAMCET 1988]
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a) NH3
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b) PH3
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c) AsH3
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d) SbH3
Explanation
Electro negativity decreases down the group and atomic radius increases as a result difference in electronegativity decreases and stability decreases. Nitrogen is most electronegative in group .Thus NH3 is most stable in given options Answer: (a)
Q.13
Phosphorus pentaoxide is widely used as ( GUJCET 2010)
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a) reducing agent
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b) oxidizing agent
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c) dehydrating agent
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d) bleaching agent
Explanation
Answer : (c) and b
Q.14
Given are H3PO3, H3PO4, H4P2O6, and H4P2O Which of the above oxoacids results into three series of salts Explanation is provided, please click on
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a )H4P2O7
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b) H3PO4
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c) H3PO3
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d) H3PO3
Explanation
The formula of phosphoric acid is H3PO4.It can give 3 hydrogen or three-protonic acid Forms two types of salts phosphite (Normal) and hydrogen phosphite (Acidic). H2PO4(-) dihydrogen phosphate like NaH2PO4 HPO4(2-) hydrogen phosphate like Na2HPO4 PO4(3-) phosphate like Na3PO4 Answer: (b)
Q.15
Producer gas is a mixture of [AIIMS 1998, 2000]
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a) CO + H2
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b) H2 + CH4
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c)CO +N2
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d) CO +H2O
Explanation
Producer gas is a mixture of CO and Nitrogen Answer : (c)
Q.16
Nitrogen dioxide [ Karnatak CET 1989]
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a) Dissolves in water forming HNO3
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b) Does not dissolve in water
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c) Dissolves in water to form HNO2 and gives off O2
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d) Dissolves in water to form a mixture of nitrous and nitric acid
Explanation
N2 or 2NO2 + H2O → HNO2 + HNO3 Answer: (d)
Q.17
The stability of hydrides follows the order [ Punjab CET 1996 ]
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a) NH3 > PH3 AsH3 > SbH3
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b) NH3 < PH3 < SbH3 < AsH3
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c) PH3 > NH3 > AsH3 > SbH3
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d) AsH3 > NH3 > PH3 > SbH3
Explanation
Thermal stability of hydrides of group 15 elements decreases down the group hence following order NH3 > PH3 AsH3 > SbH3 This is because, on moving down the group M-H bond strength decreases since the size of central atom increases from N to Sb Answer: (a)
Q.18
When AgNO3 is heated strongly the products formed are [ Roorkee 1990]
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a) No and NO2
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b) NO2 and O2
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c) NO2 and N2O
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d) NO and O2
Explanation
2 AgNO3 → Ag + 2NO2 + O2 Answer:(b)
Q.19
In the manufacture of ammonia by Heber's process, which of the following is unfavourable? [ KCET 2004 ]
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a) Increasing the temperature
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b) Increasing the pressure
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c) Reducing the temperature
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d) Removing ammonia as it is formed
Explanation
It is exothermic reaction hence increase in temperature disfavors the reaction Answer: (a)
Q.20
Ammonia compound which on heating does not give NH3 [ Roorkee 1993]
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a) (NH4)2SO4
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b) (NH4)2CO3
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c) NH4NO2
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d) NH4Cl
Explanation
NH4NO2 → N2 + 2H2O Answer: (c)
Q.21
Which of the following is metaphosphoric acid? [ J and K CET 2002]
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a) H3P3O9
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b) H5P3O10
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c) H9P2O7
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d) H3PO4
Explanation
Metaphosphoric acid is (HPO3)n hence H3P3O9 Answer: (a)
Q.22
Among the trihalides of nitrogen which one is most basic? [ Punjab CET 1997]
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a) NF3
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b) NCl3
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c) NI3
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d) NBr3
Explanation
Basic strength of nitrogen trihalides follows the order NF3 < NCl3 < NBr3 < NI3 Answer:(c)
Q.23
N forms NCl3 whereas P can form PCl3 and PCl5 why? [ Orissa JEE 2004]
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a) P has low lying 3d-orbitals, which can be used for bonding but N does not have 3d-orbitals in its valance shell
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b) N atoms is larger than P in size
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c) P is more reactive towards Cl than N
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d) None of these
Explanation
Answer: (a)
Q.24
The number of hydroxyl group in pyrophosphoric acid is [ KCET 1993]
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a) 3
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b) 4
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c) 5
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d) 7
Explanation
From above structural formula Hydroxyl group are 4 Answer: (b)
Q.25
When a vapour, at atmospheric pressure was gradually heated from 25°C its colour was found to deepen at first and then to fade as the temperature was raised above 160°C. At 600°C , the vapour was almost colourless, but its colour deepens when the pressure was raised at this temperature. the vapour was
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a) The bromine
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b) A mixture of nitrogen dioxide and dinitrogen tetraoxide
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c) Pure nitrogen dioxide
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d) Pure dinitrogen tetraoxide
Explanation
On heating N2O4 it converted into Brown coloured NO2 on further heating it is converted into colourless NO Answer: (d)
Q.26
When NH3 is passed over heated CuO, it is oxidized to [ Roorkee 1992]
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a) N2
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b) NO2
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c) HNO2
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d) N2O
Explanation
2NH3 + 3CuO → N2 + 3Cu + 3H2O Answer:(a)
Q.27
Which of the following oxide of nitrogen is a coloured gas [ IIT 1987 ]
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a) N2O
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b) NO
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c) N2O4
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d) NO2
Explanation
NO2 is brown coloured gas Answer: (d)
Q.28
The bond present in N2O5 are [ IIT 1986]
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a) Only ionic
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b) Covalent and coordinate
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c) Only covalent
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d) Covalent ionic
Explanation
Due loan pair Nitrogen can form Coordinate bonds Answer: (b)
Q.29
P4O10 is not used to dry NH3 gas because [ KCET 2001]
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a) P4O10 reacts with moisture in NH3
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b) P4O10 is not a drying agent
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c) P4O10 is acidic and NH3 is basic
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d) P4O10 is basic and NH3 is acidic
Explanation
P4O10 is acidic and NH3 is basic and reaction takes place between two P2O5 + 6NH3 + 3H2O → 2(NH4)3PO4 Answer: (c)
Q.30
Which of the following is paramagnetic? [ MPCET 1990]
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a) NO
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b) N2O4
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c) P4O6
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d) N2O5
Explanation
NO has a three electron bond Answer:(a)
0 h : 0 m : 1 s
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