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NEET Chemistry MCQ
Oxygen Family Mcq Neet Chemistry
Quiz 2
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Q.1
Which of the following is oxidised by SO2 [ BHU 1986]
0%
a) Mg
0%
b) K2Cr2O7
0%
c) KMnO4
0%
d) All
Explanation
2Mg + SO2 → 2MgO + S Answer:(a)
Q.2
Which one is known as oil of vitriol? [ CPMT 1988]
0%
a) H2SO3
0%
b) H2SO4
0%
c) H2S2O7
0%
d) H2S2O8
Explanation
Answer: (b)
Q.3
What is formed when Cl2 is bubbled through molten sulphur .. [ DPMT 1986]
0%
a) SOCl2
0%
b) SCl2
0%
c) S2Cl2
0%
d) SCl4
Explanation
S8 (liquid) + 4 Cl2(gas) → 4S2Cl2 (gas) Answer: (c)
Q.4
The acid used in lead storage cells is [ Roorkee Screening test 1989]
0%
a) Phosphoric acid
0%
b) Nitric acid
0%
c) Sulphuric acid
0%
d) Hydrochloric acid
Explanation
Answer: (c)
Q.5
Which of the following has the least bond angle? [ Pb CET 1991]
0%
a) BeF2
0%
b) H2O
0%
c) NH3
0%
d) CH4
Explanation
H2O bond angle = 104° BeF2 bond angle = 180°NH3 bond angle = 107°CH4 bond angle = 109.5° Answer:(b)
Q.6
When a lead storage battery is discharged.. [ MP PMT 1987]
0%
a) SO2 is evolved
0%
b) PbSO4 is consumed
0%
c) Lead is formed
0%
d) H2SO4 is consumed
Explanation
Answer: (d)
Q.7
S-S bond is not present in ... [ CPMT 1999]
0%
a) S2O42-
0%
b)S2O52-
0%
c) S2O32-
0%
d) S2O72-
Explanation
Answer: (d)
Q.8
Na2S2O3 is prepared by ... { Haryana CEET 2000]
0%
a) Reacting H2S2O3 with NaOH
0%
b) Reducing Na2SO4 with S in alkaline medium
0%
c) Heating NaOH and S
0%
d) Reducing Na2SO4 with S in alkaline medium
Explanation
NaOH +4S → Na2S2O3 +2Na2S + 3H2O Answer: (c)
Q.9
Which statement about H2S is false? [ Rookee screening test 2000]
0%
a) It is covalent compound
0%
b) It is a gas with bad smell
0%
c) It is weak base in water
0%
d) It is strong reducing agent than H2O
Explanation
H2S is weak acid in water, not base Answer:(c)
Q.10
Which of the following is not tetra hedral? [ MP PMT 2001]
0%
a) SCl4
0%
b) SO42-
0%
c) Ni(CO)4
0%
d) NiCl42-
Explanation
SCl4 , S is sp3d hybridized and one equatorial position occupied by a lone pair of electrons giving a see-saw shape to the molecule Answer: (a)
Q.11
Hybridization in SO3 is .. [ Haryana CEET 1999]
0%
a) sp2
0%
b) sp3
0%
c) sp2d
0%
d) sp2d2
Explanation
total valence electrons =6+6+6+6 = 24 Now 24 ÷ 8 = 3 Answer: (a)
Q.12
Which of the following reacts with con. H2SO4 [ EAM CET 1998]
0%
a) Au
0%
b) Ag
0%
c) Pt
0%
d) Pb
Explanation
2Ag + 2H2SO4 → Ag2SO4 + SO2 + 2H2O Au, Pb, Pt do not react with concentrated H2SO4 Answer: (b)
Q.13
Which of the following hydride is most acidic .. [ EAMCET 1998]
0%
a) H2Te
0%
b) H2Se
0%
c) H2O
0%
d) H2S
Explanation
Acidic character increases from top to bottom in a group Answer:(a)
Q.14
Which has maximum number of oxo groups? ... [ HAryana CEET 1994]
0%
a) H2SO4
0%
b) H2SO3
0%
c) H3PO3
0%
d) H3PO4
Explanation
oxo group means S=O or P=O, H2SO4 have two such groups, H2SO3 have one such group H3PO3 and H3PO4 have one P=O group Answer: (a)
Q.15
When a colourless gas is passed through bromine water only decoloration takes place. the gas is .. [ DEC 1994]
0%
a) SO2
0%
b) HBr
0%
c) HCl
0%
d) H2S
Explanation
Bromine water is an oxidising agent. It oxidises SO2 to SO3 and itself reduce to colourless HBr. This SO3 reacts with H2O to produce sulphuric acid Br2 + H2O → 2HBr + | O | SO2 + |O| → SO3 SO3 + H2O → H2SO3 H2S is also reduced by bromine water but there is precepitation of S Answer: (a)
Q.16
Sometimes a yellow turbidity appears while passing H2S gas even in the absence of II group radicals. This is because [ AFMC 1994]
0%
a) Sulphur is present in the mixture as impurity
0%
b) IV group radicals are precipitated as sulphides
0%
c) Of the oxidation of H2S gas by some acid radicals.
0%
d) III group radicals are precipitated as hydroxides
Explanation
Sometimes a yellow turbidity appears while passing H2S gas even in the absence of II group radicals. indicates formation of S due to the oxidation of H2S gas by some oxidising radicals such as NO3- Answer: (c)
Q.17
H2S do not produce metallic sulphite with .. [ AIIMS 1997]
0%
a) CdCl2
0%
b) ZnCl2
0%
c) COCl2
0%
d) CuCl2
Explanation
COCl2 do not contain any metal Answer:(c)
Q.18
The oxidation number of sulphur in S8 in S2F2 and H2S respectively are .. [ IIT 1999]
0%
a) 0, +1 and -2
0%
b) +2, +1, and -2
0%
c) 0, +1 and +2
0%
d) -2, +1 and -2
Explanation
Answer: (a)
Q.19
Oxalic acid when heated with H2SO4 , gives
0%
a) H2O2 and CO2
0%
b) CO and CO2
0%
c) H2O2 and CO
0%
d) CO2 and H2S
Explanation
Answer: (b)
Q.20
Which of the following is called sulphuric anhydride? [ JIPMER 1997]
0%
a) H2S2O7
0%
b) SO3
0%
c) H2S2O3
0%
d) SO2
Explanation
SO3 + H2O → H2SO4 thus SO3 called as sulphuric anhydride Answer: (b)
Q.21
Na2CO3 reacts with SO2 in alkaline solution to give .. [ CPMT 19996]
0%
a) Na2SO3
0%
b) NaHSO3
0%
c) Na2SO4
0%
d) NaHSO4
Explanation
Na2CO3 + SO2 → Na2SO3 + CO2 Answer:(a)
Q.22
Which of the following bonds has the highest energy? [ CBSE PMT 1996]
0%
a) Se - Se
0%
b) Te - Te
0%
c) S - S
0%
d) O - O
Explanation
Answer: (c)
Q.23
Permonosulphuric acid is known as? [ Bihar CEE 1995]
0%
a) Marshall's acid
0%
b) Caro's acid
0%
c) Sulphuric acid
0%
d) None of these
Explanation
H2SOO5 is permonosulphuric acid is peroxomonosulphuric acid which is also called Caro's acid Answer: (b)
Q.24
Na2CO3 reacts with SO2 in alkaline solution to give .. [ CPMT 1996]
0%
a) Na2SO3
0%
b) NaHSO3
0%
c) Na2SO4
0%
d) NaHSO4
Explanation
Na2CO3 + SO2 → Na2SO3 + CO2 Answer: (a)
Q.25
The crystalline form of sulphur stable at room temperature is [ EAMCET 1994]
0%
a) Rhombic sulphur
0%
b) Monoclinic sulphur
0%
c) Plastic sulphur
0%
d) prismatic sulphur
Explanation
Answer:(a)
Q.26
Oxygen is more electronegative than sulphur. Yet H2S is acidic while H2O is neutral. This is because .. [ DEC 1994]
0%
a) Water is a highly associated compound
0%
b) Molecular mass of H2S is more than that of H2O
0%
c) H2S is gaseous under ordinary condition while H2O is a liquid
0%
d) H - S bond is weaker than H - O
Explanation
Answer: (d)
Q.27
Polyanion formation is maximum in ... [ CBSE PMT 1994]
0%
a) Nitrogen
0%
b) Oxygen
0%
c) Sulphur
0%
d) Boron
Explanation
Due to greater tendency for catenation, sulphur shows property of poly-ionation to greater extent. Answer: (c)
Q.28
SO3 can be obtained by ... [ CBSE PMT 1994]
0%
a) S + H2SO4
0%
b) H2SO4 + PCl5
0%
c) CaSO4 + C
0%
d) Heating ferric sulphate
Explanation
Fe(SO4)3 → Fe2O3 + 3SO3 Answer: (d)
Q.29
Sodium thiosulphate is prepared by ... [ IIT 1996]
0%
a) Reducing Na2SO4 solution with H2S
0%
b) Boiling Na2SO3 with alkaline medium
0%
c) Neutralising H2S2O3 solution with NaOH
0%
d) Boiling Na2SO3 with S in an acidic medium
Explanation
In alkaline medium it can be obtained by boiling sodium hydroxide solution with sulphure powder 12NaOH + S8 → 2Na2S2O3 + 4Na2S Answer:(d)
Q.30
What is the oxidation number of sulphur in Na2S4O6 ? [ AIIMS 1998]
0%
a) 2/3
0%
b) 3/2
0%
c) 3/5
0%
d) 5/2
Explanation
Answer: (d)
0 h : 0 m : 1 s
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