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NEET Chemistry MCQ
Nitrogen Family Mcq Neet Chemistry
Quiz 1
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Q.1
Which is most explosive? [ Roorkeet 1989]
0%
a) NCl3
0%
b) PCl3
0%
c) AsCl3
0%
d) All
Explanation
Answer: (a)
Q.2
The boiling points of the following hydrides follow the order. [EAMCET 1999]
0%
a) SbH3 > NH3 > AsH3 > PH3
0%
b) NH3 > PH3 > AsH3 > SbH3
0%
c) NH3 > AsH3 >PH3 > SbH3
0%
d) SbH3 > AsH3 > NH3 > PH3
Explanation
Answer: (a)
Q.3
Which statement is wrong regarding nitrogen? [AFMC 1998]
0%
a) Supporter of life
0%
b) Hydrogen bonding
0%
c) Lighter than air
0%
d) Low boiling point
Explanation
Nitrogen is present in atmosphere ( about 71.8%). Oxygen supports life. Nitrogen don not have such direct influence Answer: (a)
Q.4
4HNO3 +P4O10 → 4HPO3 +X In the above reaction. the product X is [1999]
0%
a) NO2
0%
b) N202
0%
c) N2O4
0%
d) N2O5
Explanation
By balancing reaction we get 2N2O5 Answer: (d)
Q.5
Ammonia and sodium hypochlorite reacts to produce [2000]
0%
a) NH2OH
0%
b) NH2NH2
0%
c) N2
0%
d) NO
Explanation
NH3 + NaOCl → NH2Cl + NaOH 2NH3 + NH2Cl → NH2NH2 + NH4Cl Answer: (b)
Q.6
P2O5 is an anhydride of.. [AFMC 2000]
0%
a) HPO3
0%
b) H3PO4
0%
c) H3PO3
0%
d) H2P2O7
Explanation
P2O5 is dimer exists as P4O10 P4O10 + 6H2O → 4H3PO4 Answer: (b)
Q.7
Nessler's reagent is used for the test of [AFMC 2000]
0%
a) CO32-
0%
b) CO2
0%
c) NH4+
0%
d) SO42-
Explanation
Nessler’s reagent is prepared by following reaction 2KI + HgCl2 → HgI2 + 2KCl 2KI + HgI2 → K2HgI4 ( is called as Nessler’s reagent) Nessler’s reagent gives brown ppt. when reacts with ammonia 2K2HgI4 + NH3 + 3KOH → H2N-HgO-HgI + 7KI + 2H2O Answer: (c)
Q.8
White phosphorus reacts with caustic soda. the products are PH3 and NaH2O2 ... [ IIT 1980]
0%
a) Oxidation
0%
b) reduction
0%
c) Oxidation and reduction
0%
d) Neutralisation
Explanation
P4 + 3NaOH + 3H2O → PH3 + 3NaH2PO2 In phosphine (PH3), phosphorus has been reduced from zero to -3 and in sodium hypophosphite ( NaH2PO2), phosphorus has been oxidised from zero to +1 Answer: (c)
Q.9
PCl5 exists but NCl5does not because .. [ EAMCET 1982]
0%
a) Nitrogen has no vacant d-orbitals
0%
b) NCl5 is unstable
0%
c) Nitrogen atom is much smaller
0%
d) Nitrogen is highly inert
Explanation
Due to non availability of d orbital in N Answer: (a)
Q.10
or the manufacture of NH3 by the following reaction N2 + 3H2 →2NH3+ 21.9 kCal the favorable conditions are [AFMC 2001 ]
0%
a) low temperature, high pressure and catalyst
0%
b) high temperature, high pressure and catalyst
0%
c) high temperature, low pressure and catalyst
0%
d) low temperature, low pressure and catalyst
Explanation
Reaction is exothermic as heat is positive. Therefore low temperature will favour reaction in forward direction. And high pressure will again shift the reaction in forward direction as in forward direction number of becomes less Answer: (a)
Q.11
Which of the following fluoride does not exist? [ MP CEE 1993]
0%
a) NF5
0%
b) PF5
0%
c) AsF5
0%
d) SbF5
Explanation
Due to non availability of d orbital in Nitrogen, NF5 do not exist Answer: (a)
Q.12
NH4Cl solution is
0%
a) Neutral
0%
b) acidic
0%
c) basic
0%
d) amphoteric
Explanation
NH4Cl is the salt of strong acid and weak base NH4+ will hydrolyses water to produce H+ makes solution acidic Answer: (b)
Q.13
The laughing gas is
0%
a) Nitrous oxide
0%
b) Dintrogen trioxide
0%
c) Nitric oxide
0%
d) Nitrogen peroxide
Explanation
Nitrous oxide is also used as anesthetic Answer: (a)
Q.14
Which of the following is most metallic ... { MP CET 1993]
0%
a) P
0%
b) As
0%
c) Sb
0%
d) Bi
Explanation
Answer: (d)
Q.15
Mixture used for the tips of match stick is .. [ DPMT 1984]
0%
a) S + K
0%
b) Sb2S3
0%
c) K2Cr2O7 + S + White P
0%
d) K2Cr2O7 + K + S
Explanation
Answer: (c)
Q.16
Which of the following is tetrabasic acid? [ CPMT 1988]
0%
a) Orthophosphoric acid
0%
b) Hypophosporoic acid
0%
c) Metapphosphoric acid
0%
d) Pyrophosphoric acid
Explanation
Contain four P - OH groups and hence tetrabasic acid Answer: (d)
Q.17
Phosphine is prepared by the action of .. {MP PMT 1988]
0%
a) P and H2SO4
0%
b) P and NaOH
0%
c) P and HS
0%
d) P and HNO3
Explanation
White phosphorus is used P4 + 3NaOH + 3H2O → PH3(phosphine) + 3NaH2PO2 Answer: (b)
Q.18
The maximum concentration of nitrogen is present in: [AFMC 2003]
0%
a) nitrolim
0%
b) calcium ammonium nitrate
0%
c) ammonium sulphate
0%
d) urea
Explanation
nitrolim is -- CaCN2 calcium ammonium nitrate -- 5Ca(NO3)2. NH4NO3 .10H2O ammonium sulphate -- (NH4)2SO4 urea -- CH4N2O Urea contain 28% of ammonia which highest of all above Answer: (d)
Q.19
Which is the most reactive species of phosphorus? [AFMC 2003]
0%
a) White
0%
b) Red
0%
c) Scarlet
0%
d) Violet
Explanation
White phosphorus reacts with moist air. It is the most reactive in phosphorous allotropes Answer: (a)
Q.20
In aqua-regia the ratio of conc. HNO3 and conc. HCl present is : [2003]
0%
a) 1 : 3
0%
b) 3 : 1
0%
c) 2 : 3
0%
d) 3 : 2
Explanation
one part HNO3and three part HCl Answer: (a)
Q.21
Which of the following is pyrophosphoric acid [ AIIMS 1987]
0%
a) H3PO4
0%
b) H4P2O7
0%
c) H4P2O5
0%
d) H3PO4
Explanation
pyrophosphoric acid is obtained by condensing two molecules of H3PO4 Answer: (b)
Q.22
Lapis lazuli is : [2004]
0%
a) ferrous sulphate
0%
b) copper sulphate
0%
c) sodium aiuminosilicate
0%
d) zinc sulphate
Explanation
Lapis lazuli is mineral of aluminosilicate Answer: (c)
Q.23
Which of the following oxides of nitrogen is solid? [AFMC 2004]
0%
a) NO2
0%
b) N2O
0%
c) N2O3
0%
d) N2O5
Explanation
N2O5 is anhydride of HNO3 it is in solid form others are in gaseous form Answer: (d)
Q.24
Nitrous oxide is known as : [2004]
0%
a) breathing gas
0%
b) laughing gas
0%
c) exercising gas
0%
d) laboratory gas
Explanation
Answer: (b)
Q.25
A colourless gas with the smell of rotten fish is : [2005]
0%
a) H2S
0%
b) PH3
0%
c) SO2
0%
d) none of these
Explanation
phosphine is a colour less gas with the smell of rotten fish Answer: (b)
Q.26
Formula for tear gas is : [2005]
0%
a) COCl2
0%
b) CCl3NO2
0%
c) N2 O
0%
d) none of these
Explanation
Answer: (b)
Q.27
A gas mixture contains O2 and N2 in the ratio of 1: 4 by weight. The ratio of their number of molecules is: [2006]
0%
a) 1:8
0%
b) 1:4
0%
c) 3:16
0%
d) 7:32
Explanation
Weight Ratio 1:4 thus mole ratio 1/32 : 4/28 1/32: 1/7 or 7:32 Answer: (d)
Q.28
Pure silicon doped with phosphorus is a: [2006]
0%
a) metallic conductor
0%
b) insulator
0%
c) n-type semiconductor
0%
d) p-type semiconductor
Explanation
Silicon is semi-metal and phosphorus is penta-valent. Phosphorus will donate electrons. Thus it will be n-type semiconductor Answer: (c)
Q.29
A brown ring appears in the test for [2007]
0%
a) nitrate
0%
b) nitrite
0%
c) bromide
0%
d) iron
Explanation
Brown ring is formed during the test is due to formation of [Fe(NO)]SO4 It detect the presence of Nitrate. Answer: (a)
Q.30
Which of the following oxides of nitrogen is the anhydride of nitrous acid [AFMC 2007]
0%
a) NO
0%
b) N2O3
0%
c) N2O4
0%
d) N2O5
Explanation
Nitrogen sesquioxide or dintrogen trioxide (N2O3) is the anhydride of nitrous acid (HNO2). It is an acidic oxide of nitrogen 2HNO2→N2O3+H2O ( dehydration process) Answer: (b)
0 h : 0 m : 1 s
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