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NEET Chemistry MCQ
Oxygen Family Mcq Neet Chemistry
Quiz 1
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Q.1
Which of the following is used to absorb suphur dioxide. [ EAMCET 1980]
0%
a) Conc. H2SO4
0%
b) KOH solution
0%
c) water
0%
d) Anhydrous CaCl2
Explanation
KOH absorbs SO2 to form as salt SO2 + KOH → K2SO3 + H2O Answer: (b)
Q.2
Which of the following oxoacid of sulphur has – O – O – linkage? [NEET 2020]
0%
a) H2S2O8, peroxodisulphuric acid
0%
b) H2S2O7, pyrosulphuric acid
0%
c) H2SO3, sulphurous acid
0%
d) H2SO4, sulphuric acid
Explanation
Answer: (a)
Q.3
Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)? [NEET 2019]
0%
a) H2S < H2O < H2Se < H2Te < H2Po
0%
b) H2O < H2S < H2Se < H2Te < H2Po
0%
c) H2Po < H2Te < H2Se < H2S < H2O
0%
d) H2Se < H2Te < H2Po < H2O < H2S
Explanation
Answer: (c)
Q.4
Which of the following product is formed by the reaction of sulphur dioxide with chlorine in presence of sunlight: [2003]
0%
a) SO2Cl
0%
b) SO2Cl2
0%
c) SOCl2
0%
d) SO3Cl
Explanation
SO2 +Cl2 → SO2Cl2 ( sulphuryl chloride) Answer:(b)
Q.5
Which of the following gas mixture is used by the divers inside the sea? [2004]
0%
a) O2 + He
0%
b) O2+Xe
0%
c) O2 + Ar
0%
d) O2 + N2
Explanation
He is added with oxygen because of its smaller atomic radii. It can come out of tissue cell safely. Answer: (a)
Q.6
Which of the following is not correct? [AFMC 2008]
0%
a) 3O2 ↔ 2O3; ∆H = -284.5 kJ In presence of silent electric discharge
0%
b)Ozone undergoes addition reaction with unsaturated carbon compounds.
0%
c) Sodium thiosulphate reacts with I2 to form sodium tetrathionate and sodium iodide
0%
d) Ozone oxidises lead sulphide to lead sulphate.
Explanation
Option (a) Formation of ozone is endothermic, not exothermic. ozone is more active chemically than oxygen and decomposes readily into oxygen by exothermic reactio. Statement of option (a) is not correct Option (b) Unsaturated hydrocaron have doublebonds hence under go addition reaction option (c) Sodium thiosulfate react with iodine 2Na2S2O3 + I2 → Na2S4O6 + 2NaI Sodium thiosulfate react with iodine to produce tetrathionate sodium and sodium iodide. Option (d) Lead(II) sulfide react with ozone to produce lead(II) sulfate and oxygen. The reaction proceeds at room temperature. PbS + 4O3 → PbSO4 + 4O22 Answer: (a)
Q.7
The number of S-O-S bonds in cyclic SO3 is [2009]
0%
a) 1
0%
b) 2
0%
c) 3
0%
d) none of above
Explanation
SO3 is cyclic trimer SO3three double bonds Answer: (c)
Q.8
The correct formula of salt formed by the neutralization hypophosphorous acid with NaOH is … ( GUJCET 2007)
0%
a) Na3PO2
0%
b) Na3PO3
0%
c) NaH2PO2
0%
d) Na2HPO4
Explanation
hypophosphorous acid chemical formula H3PO2 is monobasic Reaction : H3PO2 + NaOH → NaH2PO2 + H2O Answer:(c)
Q.9
How many atoms are packed differently in cyclic form in an allotrope of monoclinic sulphur? ( GUJCET 2008)
0%
a) 2
0%
b) 10
0%
c) 8
0%
d) 6
Explanation
Sulphur and selenium exist as octa-atomic molecules ( eight atoms per molecule)and have puckered ring structure Answer: (c)
Q.10
Which of the following non-metal possesses the atomicity half that of sulphur? [ J and K CET 2002]
0%
a) Nitrogen
0%
b) Oxygen
0%
c) Phosphorus
0%
d) Arsenic
Explanation
Phosphorus has atomicity four (P4) while sulphur has eight (S8 Answer: (c)
Q.11
Bond angle is minimum for
0%
a) H2O
0%
b) H2S
0%
c) H2Se
0%
d) H2Te
Explanation
Lesser electroneagtive element lesser is the bond angle in the given option Te is least negative Answer: (d)
Q.12
There is no S - S bond in ... [ IIT 1991]
0%
a) S2O42-
0%
b) S2O52-
0%
c) S2O32-
0%
d) S2O72-
Explanation
In S2O72- there is S - O - S bond Answer:(d)
Q.13
About H2SO4 which is incorrect [ CPMT 1986]
0%
a) Reducing agent
0%
b) Dehydrating agent
0%
c) Sulphonating agent
0%
d) Highly viscous
Explanation
Answer: (a)
Q.14
A gas which can not be collected over water is ... [ IIT 1985]
0%
a) N2
0%
b) O2
0%
c) SO2
0%
d) PH3
Explanation
SO2 is highly soluble in water Answer: (c)
Q.15
Number of atoms isn one molecule of sulphur is ... [ EAMCET 1988]
0%
a) 8
0%
b) 4
0%
c) 3
0%
d) None
Explanation
Answer: (a)
Q.16
When conc. H2SO4 comes in contact with sugar, it becomes black due to... [ CPMT 1989]
0%
a) Hydrolysis
0%
b) Hydration
0%
c) Decolourisation
0%
d) Dehydration
Explanation
Answer:(d)
Q.17
Which liberates SO2 with dil H2SO4 [CPMT 1991]
0%
a) Na2SO42-
0%
b) NaHSO4
0%
c) Na2SO3
0%
d) Na2S
Explanation
Na2SO3 + H2SO4 → Na2SO42- + SO2 + H2O Na2SO42- and NaHSO4 do not react with H2SO4 Na2S Answer: (c)
Q.18
Which oxides of nitrogen is used as a catalyst in the lead chamber process for manufacture of H2SO4
0%
a) NO
0%
b) NO2
0%
c) N2O3
0%
d) N2O5
Explanation
Answer: (a)
Q.19
The oxidation states of the most electronegative element in the products of the reaction of BaO2 with dil. H2SO4 are [ IIT 1991]
0%
a) 0 and 1
0%
b) -1 and -2
0%
c) -2 and 0
0%
d) -2 and +1
Explanation
BaO2 + H2SO4 → BaSO4 + H2O2 Most electro negative element is Oxygen , Oxygen have -2 oxidation state in in BaSO4, while in H2O2 oxidation state is -1 Answer:(b)
Q.20
Bleaching action of SO2 is due to .. [ CPMT 1986]
0%
a) Reduction
0%
b) Oxidation
0%
c) Hydrolysis
0%
d) Its acidic nature
Explanation
In presence of moisture, SO2 bleaches due to reduction SO2 + 2H2O → H2SO4 + 2H and the bleaching is temporary. The colour is restored when bleach article is exposed to air Answer: (a)
Q.21
The hybridization of sulphure in SO2 is [ IIT 1998]
0%
a) sp
0%
b) sp3
0%
c) sp2
0%
d) dsp2
Explanation
Total valence electrons = 6+6+6 =18 Now 18 ÷ 8 = 2(Q) + 2(R1) R1 ÷ 2 = 2 ÷ 2 = 1 Total of Q1 + Q2+R1 = 2+1+0 = 3 Thus sp2 hybridization Answer: (c)
Q.22
Hypo is used in photography to ... [ Pb CET 1989]
0%
a) reduce AgBr grains to metallic silver
0%
b) Convert metallic silver to silver salt
0%
c) Remove undecomposed silver bromide as a soluble complex
0%
d) Remove reduced silver
Explanation
AgBr +2 Na2S2O3 → Na3 [ Ag(S2O3)2] Undecomposed AgBr forms a soluble complex with hypo, It is washed with water and the image is fixed Answer: (c)
Q.23
When SO2 is passed through acidified K2Cr2O7 solution
0%
a) the solution turn blue
0%
b) the solution is decolourised
0%
c) SOSO2 is reduced
0%
d) Green Cr2(SO4)3 is formed
Explanation
K2Cr2O7 + SO2 + H2SO4 → K2SO4 + H2O + Cr2(SO4)3(green coloured) Answer:(d)
Q.24
The chemical reaction between Na2S2O3 and I2 in aqueous medium produces.
0%
a) Na2S + NaI + H2S
0%
b) Na2SO4 + NaI + H2O
0%
c) Na2SO2 + NaI + H2O
0%
d) Na2S4O6 + NaI + H2O
Explanation
Na2S2O3 + I2 → Na2S4O6 + 2NaI Answer: (d)
Q.25
Which shows maximum catenation property .. [ AIIMS 1983]
0%
a) S
0%
b) Se
0%
c) Te
0%
d) O
Explanation
S8 exists Answer: (a)
Q.26
The products of the chemical reaction between Na2S2O3, Cl2 and H2O are .. [ EAMCET 1989]
0%
a) S + HCl + Na2S
0%
b) S + HCl + Na2SO4
0%
c) S + HCl + Na2SO3
0%
d) S+ NaClO3 + H2O
Explanation
Na2S2O3 + Cl2 + H2O → Na2SO4 + S + 2HCl Answer: (b)
Q.27
Which of the following has the highest dipole moment? [ Pb CET 1991]
0%
a) CO2
0%
b) F2
0%
c) H2O
0%
d) BeF2
Explanation
Except H2O all other compounds are linear and symmetric thus have dipole moment zero Answer:(c)
Q.28
Oleum is ... [ CBSE PMT 1991]
0%
a) Castor oil
0%
b) Oil of vitriol
0%
c) Fuming H2SO4
0%
d) None of them
Explanation
Answer: (c)
Q.29
As a fixing agent in photography, sodium thiosulphate is used for .. [ Pb.CET 1989]
0%
a) Dissolving out unreacted sliver bromide
0%
b) Converting silver halides to metallic silver
0%
c) Reducing solubility of AgBr
0%
d) Preventing overdeveloping and fogging
Explanation
Answer: (a)
Q.30
Iodine oxidises the S2O32- ion to .... [AFMC 1990]
0%
a) SO32-
0%
b) SO42-
0%
c) S4O62-
0%
d) S2-
Explanation
S2O32- + I2 →S4O62- + 2I- Answer: (c)
0 h : 0 m : 1 s
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