JEE Questions for Chemistry Class 12 P Block Elements Quiz 2 - MCQExams.com

White phosphorus is
  • a monoatomic gas
  • P4 , a tetrahedral solid
  • P8 , a crown
  • a linear diatomic molecule
(SiH3)3 N is
  • planar
  • pyramidal
  • octahedral
  • tetrahedral
Conversion of oxygen into ozone is non-spontaneous at
  • all temperature
  • high temperature
  • room temperature
  • low temperature
The atomicity of sulphur in rhombic sulphur is
  • 1
  • 2
  • 4
  • 6
  • 8
When H2S gas is passed through nitric acid, the product is
  • rhombic S
  • prismatic S (colloidal)
  • amorphous S
  • monoclinic S
  • plastic S
The ore that is concentrated by the froth floatation process is
  • cryolite
  • cuprite
  • calamine
  • chalcopyrites
Sulphuric acid has great affinity for water because
  • it hydrolyses the acid
  • it decomposes the acid
  • acid forms hydrates with water
  • acid decomposes water
Oxalic acid when heated with conc. H2SO4, gives
  • H2O2 and CO2
  • CO and CO2
  • H2O2 and CO
  • CO2 and H2S
Which compound does not has S—S bond ?
  • Na2S2O4
  • Na2S4O6
  • Na2S2O3
  • Na2S2O7
Oleum is chemically
  • H2SO3
  • H2SO5
  • H2S2O7
  • H2S2O8
The substance which does not liberate oxygen on treatment with ozone is
  • PbS
  • HCl
  • SO2
  • Hg
The function of Fe(OH)3 in the contact process is
  • to remove arsenic impurity
  • to detect colloidal impurity
  • to remove moisture
  • to remove dust particles
Concentrated sulphuric acid can be reduced by
  • NaCl
  • NaF
  • NaOH
  • NaNO3
  • NaBr
A gas, that relights glowing splinter, is
  • H2
  • O2
  • N2
  • NO2
Which element is not considered as `chalcogens'?
  • Selenium
  • Oxygen
  • Sulphur
  • Polonium
Which of the following salt would give SO2 with hot and dil. H2SO4 and also decolourises Br2 water ?
  • Na2SO3
  • NaHSO4
  • Na2SO4
  • Na2S
Excess of PCl5 reacts with conc. H2SO4 giving
  • chlorosulphonic acid
  • thionyl chloride
  • sulphuryl chloride
  • sulphurous acid
The element evolving two different gases on reaction with conc. sulphuric acid is
  • P
  • C
  • Hg
  • S
  • Sn
H2S is not a/an
  • reducing agent
  • acidic
  • oxidising agent
  • None of these
Sulphur does not exist as S2 molecule because
  • it is less electronegative
  • it is not able to constitute pπ- pπ bonds
  • it has ability to exhibit catenation
  • of tendency to show variable oxidation states
Polyanion formation is maximum in
  • nitrogen
  • sulphur
  • oxygen
  • boron
Oleum is
  • castor oil
  • oil of vitriol
  • fuming H2SO4
  • None of these
The catalyst used in the manufacture of H2 SO4 by contact process is
  • V2O3
  • V2O5
  • FeO
  • Cu
SO2 does not act as
  • bleaching agent
  • oxidising agent
  • reducing agent
  • dehydrating agent
If an allotropic form changes slowly to a stable form. It is called
  • enantiotropy
  • dynamic allotropy
  • monotropy
  • None of these
The most abundant element in the earth crust is
  • O
  • Si
  • H
  • C
Industrial name of H2S2O7 is
  • pyrosulphuric acid
  • Marshall's acid
  • oleum
  • All of these
Bleaching action of SO2 is due to its
  • oxidising property
  • acidic property
  • basic property
  • reducing property
Copper turnings on heating with conc. H2SO4 produce
  • H2S
  • O2
  • SO3
  • SO2
The molecular formula of dithionic acid is
  • H2S2O4
  • H2S2O6
  • H2S2O5
  • H2S2O7
In presence of moisture, SO2 can
  • act as oxidant
  • act as reductant
  • gain electron
  • not act as reductant
Which of the following is not oxidised by O3 ?
  • KI
  • FeSO4
  • KMnO4
  • K2MnO4
Which requires catalyst ?
  • S + O2 → SO2
  • 2SO2 + O2 → 2SO3
  • C + O2 → CO2
  • All of the above
Iodine is formed when potassium iodide reacts with a solution of
  • ZnSO4
  • CuSO4
  • ( NH4 )2 SO4
  • Na2 SO4
The interhalogen having dimeric structure is
  • ClF3
  • BrF3
  • IF3
  • lCl3
Among the following molecule which has the zero dipole moment ?
  • BF3
  • H2O
  • NF3
  • ClO2
Which of the following halides reacts (s) with AgNO3 (aq) to give a precipitate that dissolves in Na2S2O3 (aq)?
  • HCl
  • HBr
  • HI
  • All of these
Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid, is
  • Cl2O
  • Cl2O7
  • ClO2
  • Cl2O6
Which of the following is not a pseudohalide ?
  • RCOO -
  • N3-
  • CNO -
  • CN -
Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl ?
  • MnO2
  • H2S
  • KMnO4
  • Cr2O3
In halogen's group which element has highest electron affinity ?
  • F
  • Cl
  • Br
  • I
Which one is the anhydride of HClO4?
  • ClO2
  • Cl2O7
  • Cl2O
  • Cl2O6
In the manufacture of bromine from sea water, the mother liquor containing bromide is treated with
  • carbon dioxide
  • chlorine
  • iodine
  • sulphur dioxide
ClO- disproportionate into
  • Cl- and O
  • Cl- and ClO3-
  • Cl and O
  • Cl- and O-
The following species will not exhibit disproportionation reaction

  • Chemistry-Class 12 p Block Elements-2401.png
  • 2)
    Chemistry-Class 12 p Block Elements-2402.png

  • Chemistry-Class 12 p Block Elements-2403.png

  • Chemistry-Class 12 p Block Elements-2404.png
Correct order of electron affinities of halogens is
  • F > Cl > Br > I
  • I > Br > Cl > F
  • Cl >F > I > Br
  • Cl > F > Br > I
Which one of the following reactions does not occur ?
  • F2 + 2Cl‒ → 2F‒ + Cl2
  • Cl2 + 2F‒ → 2Cl‒ + F2
  • Br2 + 2I‒ → 2Br‒ + I2
  • Cl2 + 2Br‒ → 2Cl‒ + Br2
Which of the following pairs has bleaching property ?
  • O3 and NO2
  • O3 and H2S
  • SO2 and Cl2
  • Cl2 and NO2
The correct order of heat of formation of halogen acids is
  • HI > HBr > HCl > HF
  • HF > HCl > HBr > HI
  • HCl > HF > HBr > HI
  • HCl > HBr > HF > HI
When chlorine reacts with dil. NaOH under cold conditions, the oxidation state of chlorine changes from zero to
  • -1 and +5
  • +1 and +4
  • +5 and +3
  • -1 and +1
0:0:1


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