JEE Questions for Chemistry Class 12 P Block Elements Quiz 1 - MCQExams.com

SO2 + H2S → Product. The final product is
  • H2O + S
  • H2SO4
  • H2SO3
  • H2S2O3
Crystalline metal can be transformed into metallic glass by
  • Alloying
  • Pressing into thin plates
  • Slow cooling of molten metal
  • Very rapid cooling of the molten metal
Which metal is protected by a layer of it own oxide
  • Al
  • Ag
  • Au
  • Fe
The product formed in the reaction of SOCl2 with white phosphorus is
  • PCl3
  • SO2Cl2
  • SCl2
  • POCl3
Which has the smallest size ?
  • Na +
  • Mg 2+
  • Al 3+
  • P 5+
Solid N2O5 is
  • ionic
  • covalent
  • coordinate covalent
  • metallic
Which of the following phosphorus is the most reactive ?
  • Red phosphorus
  • White phosphorus
  • Scarlet phosphorus
  • Violet phosphorus
Which one of the following is least covalent in nature ?
  • NF3
  • BiF3
  • PF3
  • SbF3
Which of the following oxides, at the same concentration when dissolved in water, results in the most acidic solutions ?
  • CO2
  • B2 O3
  • N2 O5
  • Li2 O2
Which is the anhydride of nitric acid ?
  • NO
  • NO2
  • N2O3
  • N2O5
Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of
  • NO
  • NO2
  • N2O
  • N2O4
Which of the following is tetrabasic acid ?
  • Orthophosphorus acid
  • Orthophosphric acid
  • Metaphosphoric acid
  • Pyrophosphoric acid
Which of the following is most acidic hydride of nitrogen ?
  • N3 H
  • NH3
  • N2 H4
  • Both N3 H and NH3
Soid PCl5 exists as

  • Chemistry-Class 12 p Block Elements-2333.png
  • 2)
    Chemistry-Class 12 p Block Elements-2334.png

  • Chemistry-Class 12 p Block Elements-2335.png

  • Chemistry-Class 12 p Block Elements-2336.png
Extra pure N2 can be obtained by heating
  • NH3 with CuO
  • NH4 NO3
  • (NH4)2 Cr2O7
  • Ba(N3)2
Among the following, the number of compounds that can react with PCl5 to give POCl3 is O2 , CO2 , SO2, H2O, H2SO4, P4O10.
  • 1
  • 2
  • 3
  • 4
The least stable hydride of 15th group elements is
  • NH3
  • PH3
  • AsH3
  • SbH3
  • BiH3
Ammonia is dried over
  • slaked lime
  • calcium chloride
  • phosphorus pentoxide
  • quicklime
Phosphorus pentoxide is widely used as
  • bleaching agent
  • dehydrating agent
  • oxidising agent
  • reducing agent
The reaction of P4 with aqueous NaOH gives
  • P(OH)3
  • P2O5
  • P(OH)5
  • PH3
Which element is used in the preparation of pesticides ?
  • Arsenic
  • Bismuth
  • Antimony
  • Nitrogen
Reaction of PCl3 and PhMgBr would give
  • bromobenzene
  • chlorobenzene
  • triphenyl phosphine
  • dichlorobenzene
The most stable hydride is
  • NH3
  • PH3
  • AsH3
  • SbH3
Which of the element of nitrogen family produce maximum number of oxyacids ?
  • N
  • P
  • As
  • Sb
H3 PO3 has.............. non-ionisable P—H bonds.
  • 3
  • 1
  • 2
  • None of these
Which of the following(s) when heated give nitrogen gas ?
  • (NH4)2 Cr2 O7
  • Ba(N3)2
  • NH4 NO3
  • Both (and (
The catalyst used in the manufacture of ammonia is
  • V2 O5
  • Pt
  • Fe
  • Ni(CO)4
Which is tribasic acid ?
  • H3 PO2
  • H3 PO4
  • H4 P2 O7
  • H3 PO3
Which one of the following pentafluorides cannot be formed ?
  • PF5
  • AsF5
  • SbF5
  • BiF5
Sodium pyrophosphate is represented by which of the following formula ?
  • Na2 P2 O4
  • Na4 P2 O5
  • Na4 P2 O7
  • Na2 P2 O5
Which are the products obtained when ammonia is reacted with excess chlorine ?
  • N2 and NCl3
  • N2 and HCl
  • N2 and NH4Cl
  • NCl3 and HCl
The basicity of H3 PO4 is
  • 2
  • 3
  • 4
  • 5
Zinc and cold dil.HNO3 reacts to produce
  • NO
  • NO2
  • NH4 NO3
  • ZnNO3
The treatment of Cu with dilute HNO3 gives
  • N2O
  • NO

  • Chemistry-Class 12 p Block Elements-2356.png
  • NO2
Which of the following oxyacids of phosphorus is a reducing agent and monobasic ?
  • H3PO2
  • H3PO3
  • H3PO4
  • H4P2O6
Pnicogens are the elements of group
  • 15
  • 13
  • 8
  • zero
Which of the following forms vortex ring?
  • P2O5
  • PH3
  • NH3
  • P4O10
Pb reacts with dilute HNO3 gives
  • NO
  • NH4 NO3
  • N2 O5
  • NO2
Which gas is evolved by the treatment of magnesium with very dilute solution of HNO3
  • N2
  • NO2
  • H2
  • H2O
Which of the following oxide does not form acidic aqueous solution ?
  • N2O3
  • NO2
  • N2O5
  • NO
The metal which does not form ammonium nitrate by reaction with dilute nitric acid is
  • Al
  • Fe
  • Pb
  • Mg
In the electrothermal process, the compound displaced by silica from calcium phosphate is
  • calcium phosphide
  • phosphine
  • phosphorus
  • phosphorus pentoxide
What is the product formed when phosphorus trioxide is dissolved in water ?
  • HPO3
  • H3PO4
  • H3PO3
  • HPO2
Hypophosphorus acid, H3 PO2 is
  • a monobasic acid
  • a tribasic acid
  • a dibasic acid
  • not acidic at all
Which is most thermodynamically stable allotropic form of phosphorus ?
  • Red
  • White
  • Black
  • Yellow
Which blue-liquid is obtained on reacting equimolar amounts of two gases at -30° C ?
  • N2O
  • N2O3
  • N2O4
  • N2O5
The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorus acid is
  • three
  • one
  • two
  • zero
In Ostwald process of manufacturing of HNO3 , catalyst used is
  • Mo
  • Fe
  • Mn
  • Pt
When heated NH3 is passed over CuO, gas evolved is
  • N2
  • N2O
  • HNO3
  • NO2
Which of the following is kept in water ?
  • White phosphorus
  • Sodium
  • Potassium
  • Calcium
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