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NEET Chemistry MCQ
Oxygen Family Mcq Neet Chemistry
Quiz 3
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Q.1
The geometry of H2S and its dipole monet are [ IIT 1999]
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a) Angular and non zero
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b) Angular and zero
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c) linear and non zero
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d) Linear and zero
Explanation
sp3 and two loan pairs occupy vertices of pyramidal structure Answer: (a)
Q.2
By passing H2S gas in acidified KMnO4 solution, we get [ MP CEE 1998]
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a) K2S
0%
b) S
0%
c) K2SO3
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d) MnO2
Explanation
2KMnO4 + 3H2SO4 + 5H2S → K2SO4 + H2O + 2MnSO4 Answer: (b)
Q.3
All the elements of oxygen family are [ MP PMT 1998]
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a) Non metals
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b) Metalloids
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c) Radioactive
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d) Polymorphic
Explanation
All the elements of oxygen family exist in more than one form ( polymorphic) Answer:(d)
Q.4
When sulphur is boiled with Na2SO3 solution, the compound formed is [ Roorkee Screeing test 1992]
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a) Sodium sulphide
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b) Sodium sulphate
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c) Sodium perdulphate
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d) Sodium thiosulphate
Explanation
NaSO3 + S → Na2S2O3 ( sodium thiosulphate also called as hypo) Answer: (d)
Q.5
Identify the incorrect statement with respect to ozone .. [ AIIMS 1994]
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a) Ozone is formed in the upper atmosphere by photochemical reaction involving dioxygen
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b) Ozone is more reactive than dioxygen
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c) Ozone is diamagnetic whereas dioxygen in paramagentic
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d) Ozone protects the earth's inhabitants by absorbing gamma-radiations
Explanation
Ozone absorbs ultra violet radiations Answer: (d)
Q.6
Which type of bond is there in H2S molecule [ Pb PMT 1998]
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a) Ionic
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b) Covalent
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c) Coordinate
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d) All of these
Explanation
Answer: (b)
Q.7
Which of the following behaves as both oxidising and reducing agent? [ AFMC 1995]
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a) H2SO4
0%
b) SO2
0%
c) H2S
0%
d) HNO3
Explanation
Answer:(b)
Q.8
Which of the following formula represents the fuming sulphuric acid ... [ CPMT 1992]
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a) H2S2O4
0%
b) H2SO5
0%
c) H2S2O7
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d) H2S2O8
Explanation
Answer: (c)
Q.9
A substance on treatment with dil. H2SO4 liberated a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. These reactions indicates the presence of ... [ IIT screening
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a) CO32-
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b) S2-
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c) SO32-
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d) NO2-
Explanation
Since colourless gas turns baryta water ( Ba(OH)2 solution) turbid and turing acidic solution of dichromate solution green indicate evolution of SO2 . And can be obtain only from SO32- out of the options given Answer: (c)
Q.10
K2CS3 can be called potassium [ CPMT 1994]
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a) Sulphocyanide
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b) Thiocarbide
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c) Thiocarbonate
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d) Thiocyanate
Explanation
Answer: (c)
Q.11
Bromine water reacts with SO2 to form? [ AFMCE 1994]
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a) H2O + HBr
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b) H2SO4 + HBr
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c) HBr and S
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d) S and H2O
Explanation
Br2 + 2H2O + SO2 → 2HBr + H2SO4 Answer:(b)
Q.12
Hydrolysis of one mole of peroxodisulphuric acid produces ... [ IIT 1996]
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a) Two moles of sulphuric acid
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b) Two moles of peroxomonosulphuric acid
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c) One mole of sulphuric acid and one mole of peroxomonosulphuric acid
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d) One mole each of sulphuric acid, peroxomonosulphric acid nd hydrogen peroxide
Explanation
H2S2S8 + H2O → H2SO4 + H2SO5 ( peroxomonosulphuric acid) Answer: (c)
Q.13
The final acid obtained during the manufacture of H2SO4, by contact process is [ SCRA 1991]
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a) H2SO4(conc.)
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b) H2SO4(dil.)
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c) H2SO4
0%
d) H2S2O7
Explanation
In contact process SO3 is dissolved in H2SO4 Answer: (d)
Q.14
Acidified solutions of sodium thiosulphate are unstable because in thiosulphate .. [ AIIMS 1994]
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a) The two sulphur atoms are at unstable oxidation state of +2
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b) The two sulphur atoms are at different oxidation states of +6 and -2
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c) The S-S bonds are unstable
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d) Thio compounds contains S in oxidation state of zero
Explanation
Thiosulphate ion (S2O32-) contains two sulphur atoms in different oxidation state of +6 and -2 and is highly unstable in presence of acidic medium. Na2S2O3 +2Hcl → 2NaCl + SO2 + S + H2O Answer: (b)
Q.15
Sulphuric acid reacts with Pcl5 to give .. [ Haryana CEET 1996]
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a) Thionyl chloride
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b) Sulphur monochloride
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c) Sulphuryl chloride
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d) Sulphur tetrachloride
Explanation
2PCl5 + H2SO4 → POCl3 + HCl + SO2Cl2 9sulphuryl chloride) Answer:(c)
Q.16
Which of the following does not show hydrogen bonding? [ AIIMS 1998]
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a) H2S
0%
b) H2O
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c) N2O
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d) Fe3O4
Explanation
Electro negativity of S is very low thus does not show hydrogen bonding Answer: (a)
Q.17
If cold barium nitrate is mixed with H2SO4, which of the following is formed? [ CPMT 1995]
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a) HNO2 + BaSO4
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b) HNO3 + BaSO4
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c) BaSO4 + NO2
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d) BaSO4 + N2 O3
Explanation
Ba(NO2)2 + H2SO4 → BaSO4 + 2HNO2 Answer: (a)
Q.18
In the reaction H2S ⇔ 2H+ + S2- when NH4OH is added then ...... [ Manipal PMT 1994]
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a) S2- is precipitated
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b) No action takes place
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c) Concentration of S2 decreases
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d) Concentration of S2 increases
Explanation
H2S ⇔ 2H+ + S2- 2NH4OH ⇔ 2NH4+ + 2OH- 2H+ + 2OH- → 2H2O Thus concentration of S2- increases Answer: (d)
Q.19
The acid which as a peroxy linkage is .[ CBSE PMT 1994]
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a) Sulphurous acid
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b) Pyrosulphuric acid
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c) Dithionic acid
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d) Caro's acid
Explanation
Caro's acid is H2SO5 which contain one S - O - OH peroxy linkage Answer:(d)
Q.20
Sulphur molecule is .. [ AFMC 1991]
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a) Diatomic
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b) Triatomic
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c) Tetra atomic
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d) Octatomic
Explanation
Sulphur molecule contains 8 atoms of sulphur Answer: (d)
Q.21
The number of dative bonds in sulphuric acid molecule is [ MP PET 2002]
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a) 0
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b) 1
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c) 2
0%
d) 4
Explanation
Sulphuric acid have two coordinate bond with Oxygen Answer: (c)
Q.22
Number of bonds in SO2 are .. [ DEC 2001]
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a) Two σ and two π
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b) Two σ and one π
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c) Two σ and two π and one lone pair
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d) None of these
Explanation
Answer: (c)
Q.23
Molecular shapes of SF4, CF4 and Xe4 are [ IIT screening test 2000]
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a) same, with 2, 0, 1 lone pair of electrons respectively
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b) same, with 0, 1, 2 lone pairs of electrons respectively
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c) different, with 0, 1, 2 lone pairs of electrons respectively
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d) different with 1, 0, 2 lone pairs of electrons respectively
Explanation
SF4 (sp3d, trigonal bipyramidal with one equatorial position occupied by 1 lone pair), CF4 (sp3, tetrahedral, no lone pair), XeF4 (sp3d2, square planar, two lone pairs) Answer:(d)
Q.24
When potassium ferrocyanide crystals are heated with conc. H2SO4, the gas evolved is ... [ KCET 2000]
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a) SO2
0%
b) NH3
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c) CO2
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d) CO
Explanation
K4[Fe(CN)6] + 6H2SO4 + 6H2O → 2K2SO4 + FeSO4 + 6CO + 3(NH4)2SO4 Answer: (d)
Q.25
Amongst H2O, H2O, H2Se and H2Te, the one with the highest boiling point is [ IIT screening test 2000]
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a) H2O because of hydrogen bonding
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b) H2Te because of higher molecular weight
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c) H2S because of hydrogen bonding
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d) H2Sc because of lower molecular weight
Explanation
Answer: (a)
Q.26
The compound of sulphur that can be used as refrigerant is .. [ Manipal PMT 2001]
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a) SO2
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b) SO3
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c) S2Cl2
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d) H2SO4
Explanation
Answer: (a)
Q.27
Which of the following species is basic and reducing? [ Chd. CET 2002]
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a) SO32-
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b) SO42-
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c) S2O42-
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d) HSO4-
Explanation
SO32- due to presence of lone pair of electrons on S acts as lewis base and also it is reducing in character Answer:(a)
Q.28
When H2S gas is passed through nitric acid, the product is [ Kerala CEE 2002]
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a) Rhombic S
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b) Prismatic S
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c) Amorphous S
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d) Monoclinic S
Explanation
H2S + |O| ( from(HNO3) → H2O + S (rhombic sulphur) Answer: (a)
Q.29
In OF2 molecule, the total number of bond pairs and lone pairs of electrons present respectively are ... [ DPMT 2002]
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a) 2, 6
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b) 2, 8
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c) 2, 10
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d) 2, 9
Explanation
Answer: (b)
Q.30
Atomicity of sulphur in rhombic sulphur is [ kerala CEE 2001]
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a) 1
0%
b)4
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c) 8
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d) 12
Explanation
rhombic sulphur is S8 molecule Answer: (c)
0 h : 0 m : 1 s
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