JEE Questions for Chemistry Class 12 P Block Elements Quiz 4 - MCQExams.com

Which one of the following oxides of nitrogen dimerises into a colourless solid/liquid on cooling ?
  • N2 O
  • NO
  • N2 O3
  • NO2
  • N2 O5
An element belongs to group 15 and third period of the periodic table. Its electronic configuration will be
  • 1s2 2s2 2p3
  • 1s2 2s2 2p4
  • 1s2 2s2 2p6 3s2 3p3
  • 1s2 2s2 2p6 3s2 3p2
NO2 is not obtained on heating
  • AgNO3
  • KNO3
  • Cu(NO3)2
  • Pb(NO3)2
Given are H3PO2, H3PO3, H3PO4 and H4P2O7.Which of the above oxoacids results into two series of salts ?
  • H3PO2
  • H3PO3
  • H3PO4
  • H4P2O7
The reaction of P4 with X leads selectively to P4O6 . The X is
  • dry O2
  • a mixture of O2 and N2
  • moist O2
  • O2 in the presence of aqueous NaOH
In which of the following, NH3 is not used ?
  • Tollen's reagent
  • Nessler's reagent
  • Group reagent for the analysis of IV group basic radicals
  • Group reagent for the analysis of III group basic radicals
If NO2 ( N2O4 ) is dissolved in NaOH, we get solution of
  • NaNO2
  • NaNO3
  • mixture of NaNO2 and NaNO3
  • NaNO4
The correct order of reducing abilities of hydrides of V group elements is
  • NH3 < PH3 < AsH3 < SbH3 < BiH3
  • NH3 > PH3 > AsH3> SbH3 > BiH3
  • NH3 < PH3 > AsH3 > SbH3 > BiH3
  • SbH3 > BiH3 > AsH3 > NH3 > PH3
Which of the following pairs is obtained on heating ammonium dichromate ?
  • N2 and H2 O
  • N2 O and H2 O
  • NO2 and H2 O
  • NO and NO2
The correct order of acidic nature of oxides is in the order
  • NO < N2O < N2O3 < NO2 < N2O5
  • N2O < NO < N2O3 < NO2 < N2O5
  • N2O5 < NO2 < N2O3 < NO < N2O
  • N2O5 < N2O3 < NO2 < NO < N2O
Which of the following is the correct order of increasing enthalpy of vaporisation ?
  • NH3 < PH3 < AsH3
  • AsH3 < PH3 < NH3
  • PH3 < AsH3 < NH3
  • NH3 < AsH3 < PH3
Liquor ammonia bottles are opened only after cooling. This is because
  • it is a mild explosive
  • it generates high vapour pressure
  • Both (and (
  • it is a lachrymatory
The atomicity of phosphorus is X and the PPP bond angle in the molecule is Y . What are X and Y
  • X = 4, Y = 90°
  • X = 4, Y = 60°
  • X = 3, Y = 120°
  • X = 2, Y = 180°
Correct order of decreasing thermal stabililty is as
  • NH3 > PH3 > AsH3 > SbH3
  • PH3 > NH3 > AsH3 > SbH3
  • AsH3 > PH3 > NH3 > SbH3
  • SbH3 > AsH3 > PH3 > NH3
Red P can be obtained by white P by
  • heating it with a catalyst in an inert atmosphere
  • distilling it in an inert atmosphere
  • dissolving it in CS2 and crystallising
  • melting it and pouring the liquid into water
Liquor ammonia is
  • ammonium hydroxide
  • liquefield ammonia gas
  • concentrated solution of NH3 in water
  • a solution of NH3 in alcohol
The correct order of boiling points of the hydrides of nitrogen family is
  • NH3 > PH3 > AsH3 > SbH3
  • PH3 < AsH3 < NH3 < SbH3
  • NH3 < PH3 < SbH3 < AsH3
  • NH3 < PH3 < AsH3 < SbH3
NaNH2 + N2O → X + NaOH + NH3. What is the X ?
  • NaN2
  • Na3N
  • NaN3
  • None of these
P4 + 3NaOH + 3H2O → A + 3NaH2PO2, here A is
  • NH3
  • PH3
  • H3 PO4
  • H3 PO3
The sides of safety matches contains
  • red phosphorus + sand powder
  • P4 S3
  • Ca3 (PO)4 + glass pieces
  • KClO3 , KNO3 , sulphur + antimony
The decreasing values of bond angles from NH3 (107° ) to SbH3 (91° ) down the group-15 of the periodic table is due to
  • increasing bp-bp repulsion
  • increasing p-orbital character in sp3
  • decreasing lp-bp repulsion
  • decreasing electronegativity
As the number of — OH groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength
  • increases
  • decreases
  • remains nearly same
  • remains appropriately same
PCl3 and cold water reacts to produce which of the following ?
  • H3 PO3
  • H3 PO2
  • H4 P2 O7
  • H3 PO4
Which phosphorus reacts with KOH solution to produce phosphine gas ?
  • White phosphorus
  • Red phosphorus
  • Both (and (2)
  • None of the above
Hydrolysis of NCl3 gives NH3 and X. Which of the following is X ?
  • HClO4
  • HClO3
  • HOCl
  • HClO2
Calcium cyanamide on treatment with steam produces
  • NH3 + CaO
  • NH3 + CaHCO3
  • NH3 + CaCO3
  • NH3 + Ca(OH)2
Dinitrogen pentoxide (N2O5), a colourless solid, is prepared by
  • heating NH4NO2 with an excess of oxygen
  • dehydrating HNO3 with CaO
  • dehydrating HNO3 with P4O10
  • heating a mixture of HNO2 and Ca(NO3)2
Incorrect statement for pyrophosphoric acid H4P2O5 is
  • it contains P in + 5 oxidation state
  • it is dibasic acid
  • it is strongly reducing in nature
  • it contains one P —O—P bond
In which of these processes platinum is used as a catalyst?
  • Oxidation of ammonia to form HNO3
  • Hardening of oils
  • Production of synthetic rubber
  • Synthesis of methanol
Iron is dropped in dil. HNO3, it gives
  • ferric nitrate
  • ferric nitrate and NO2
  • ferrous nitrate and ammonium nitrate
  • ferrous nitrate and nitric oxide
When plants and animals decay, the organic nitrogen is converted into inorganic nitrogen. The inorganic nitrogen is in the form of
  • ammonia
  • elements of nitrogen
  • nitrates
  • nitrides
Which of the following is not correct ?
  • Ammonia is used as refrigerant
  • A mixture of Ca(CN)2 and C is known as nitrolim
  • A mixture of Ca(H2PO4)2 and CaSO4 ∙2H2O is known as superphosphate of lime
  • Hydrolysis of NCl3 gives NH3 and HOCl
The structure of orthophosphoric acid is

  • Chemistry-Class 12 p Block Elements-2462.png
  • 2)
    Chemistry-Class 12 p Block Elements-2463.png

  • Chemistry-Class 12 p Block Elements-2464.png

  • Chemistry-Class 12 p Block Elements-2465.png
Which of the following is a tribasic acid ?
  • H3PO4
  • HPO3
  • H4P2O7
  • H4P2O6
Consider the following statements.
I. NCl5 does not exist while PCl5 does.
II. Both O+2 and NO are paramagnetic.
III. The three C—O bonds are not equal in carbonate ion.
IV. Lead prefers to form tetravalent compound.
Which of the above statements are incorrect ?
  • I and III
  • I, III and IV
  • II an III
  • III and IV
When the substances CCl4 , CH4 and CF4 are arranged in order of increasing boiling point, what is the correct order ?
  • CCl4 , CF4 , CH4
  • CH4, CF4 , CCl4
  • CF4 , CCl4 , CH4
  • CF4 , CH4 , CCl4
A crystalline solid X reacts with dil. HCl to liberate a gas Y. Y decolourises acidified KMnO4. When a gas Z is slowly passed into an aqueous solution of Y, colloidal sulphur is obtained X and Z could be respectively
  • Na2S, SO3
  • Na2SO4, H2S
  • Na2SO3, H2S
  • Na2SO4, SO2

Chemistry-Class 12 p Block Elements-2471.png

  • Chemistry-Class 12 p Block Elements-2472.png
  • 2)
    Chemistry-Class 12 p Block Elements-2473.png

  • Chemistry-Class 12 p Block Elements-2474.png

  • Chemistry-Class 12 p Block Elements-2475.png
The correct statements (s) about O3 is (are)
  • O—O bond lengths are equal
  • O3 is diamagnetic in nature
  • O3 has a bent structure
  • All of these
Which of the following statements regarding sulphur is incorrect ?
  • SO2 molecule is paramagnetic
  • The vapour at 200°C consists mostly of S8 rings
  • At 600°C the gas mainly consists of S2 molecules
  • The oxidation state of sulphur is never less than + 4 in its compounds
Which one of the following is not true at room temperature and pressure?
  • P4O10 is a white solid
  • SO2 is a colourless gas
  • SO3 is a colourless gas
  • NO2 is brown gas
Select the incorrect statement among the following.
  • O3 is used as germicide for purification of air
  • In O3 , O—O bonds length is identical with that of molecular oxygen.
  • O3 molecule is angular in shape.
  • O3 is an oxidising agent.
In the laboratory H2S gas is prepared by using black lumps and dil. H2SO4 . The black lumps are
  • FeSO4
  • MnO2
  • FeS
  • FeSO3
Ozone is used for purifying water because
  • it dissociates and release oxygen
  • do not leave any foul smell like chlorine
  • kills bacteria, cyst, fungi and acts as a biocide
  • All of the above
When conc. H2SO4 is heated with P2O5 , the acid is converted into
  • sulphur trioxide
  • sulphur dioxide
  • sulphur
  • a mixture of sulphur dioxide and sulphur trioxide
Which of the following is not a peroxy acid ?
  • Perphosphoric acid
  • Pernitric acid
  • Perdisulphuric acid
  • Perchloric acid
At T (K), 100 L of dry oxygen is present in a sealed container. It is subjected to silent electric discharge, till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at T (K) ?
  • 50
  • 60
  • 30
  • 40
Which one of the following pairs of reactants does not form oxygen when they react with each other ?
  • F2 , NaOH solution (hot, conc.)
  • F2 , H2O
  • Cl2 , NaOH solution (cold, dilute)
  • CaOCl2 , H2 SO4 (dilute, small amount)
In the manufacture of sulphuric acid by contact process, Tyndall box is used to
  • filter dust particles
  • remove impurities
  • convert SO2 to SO3
  • test the presence of dust particles
Among the following oxoacids, the correct decreasing order of acid strength is
  • HOCl > HClO2 > HClO3 > HClO3
  • HClO4 > HOCl > HClO2 > HClO3
  • HClO4 > HClO3 > HClO2 > HOCl
  • HClO2 > HClO4 > HClO3 > HOCl
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