CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 12 - MCQExams.com

Sulphuryl chloride $$(SO_2Cl_2)$$ reacts with white phosphorus $$(P_4)$$ to give:
  • $$PCl_5, SO_2$$
  • $$OPCl_3, SOCl_2$$
  • $$PCl_5, SO_2, S_2Cl_2$$
  • $$OPCl_3, SO_2, S_2Cl_2$$
 Bond energy of $$F_2, Cl_2$$ and $$Br_2$$ follow the order:
  • $$F - F > Cl - Cl > Br - Br$$
  • $$Cl - Cl >Br - Br > F - F$$
  • $$Br - Br > Cl - Cl > F - F $$
  • $$Cl - Cl > F - F > Br - Br $$
Why is argon used in lamps?
  • Argon forms molecules when electricity is passed through it
  • Argon is inert and so does not react with the hot filament
  • Argon is less dense than air
  • Argon produces light when it burns
Ammonia gas can be dried over by:
  • $$Ca{ Cl }_{ 2 }$$
  • conc. $${ H }_{ 2 }S{ O }_{ 4 }$$
  • $${ P }_{ 2 }{ O }_{ 5 }$$
  • quick lime
Haber process is used for the production of:
  • $$NH_{3}$$
  • $$HNO_{3}$$
  • $$H_{2}SO_{4}$$
  • $$O_{3}$$
The table shows some information about elements in Group VII of the Periodic Table. 
NameState at room temperatureColour
ChlorineGasyellow-green
Bromineliquidbrown
Iodine??
Astainesolidblack
Which information about iodine completes the table?
  • State - liquid, colour - black
  • State - liquid, colour - green
  • State - solid, colour - grey
  • State - solid, colour - yellow
Which oxide is insoluble in aqueous sodium hydroxide?
  • MgO
  • $$Al_2O_3$$
  • $$P_4O_{10}$$
  • $$SO_2$$
Which of the following inert gas participate in chemical reaction?
  • $$Xe$$
  • $$He$$
  • $$Ne$$
  • None
Nitric acid can be obtained from ammonia via the formations of the intermediate compounds:
  • nitric oxide and nitrogen dioxide
  • nitrogen and nitric oxide
  • nitric oxide and dinitrogen pentoxide
  • nitrogen and nitrous oxide
Which of the following elements can be involved in p$$\pi-d\pi$$ bonding?
  • Carbon
  • Nitrogen
  • Phosphorus
  • Boron
Which among the following is inert gas and not very soluble in water too?
  • $$\displaystyle { O }_{ 2 }$$
  • $$\displaystyle { CO }_{ 2 }$$
  • $$\displaystyle { N }_{ 2 }$$
  • $$\displaystyle { H }_{ 2 }{ SO }_{ 4 }$$
  • $$\displaystyle He$$
Pressure is increased in the Haber process for making ammonia. It favors :
  • the reverse reaction
  • the forward reaction
  • neither reaction
  • none
Which one of the following order is correct for the bond dissociation enthalpy of halogen molecules?
  • $$I_{2} > Br_{2} > Cl_{2} > F_{2}$$
  • $$Cl_{2} > Br_{2} > F_{2} > I_{2}$$
  • $$Br_{2} > I_{2} > F_{2} > Cl_{2}$$
  • $$F_{2} > Cl_{2} > Br_{2} > I_{2}$$
Which of the following is most electronegative element?
  • Al
  • F
  • Ca
  • Li
  • C
Which element is more likely to exist in many different forms?
  • Barium
  • Phosphorous
  • Rubidium
  • Fluorine
  • Manganese
Find the gases which is the densest at standard temperature and pressure.
  • Helium
  • Argon
  • Carbon dioxide
  • Xenon
  • Nitrogen
 In commercial industry, ammonia is prepared by :
  • decomposition of salts
  • contact process
  • arc process
  • combining  hydrogen and nitrogen gases (Haber process)
Read the two statements given below and answer whether they are true or false.

Statement I: $${He}_{2}$$ is not a commonly known form.

Statement II: $$He$$ is lighter than air.
  • Both the statements are false
  • Statement $$I$$ is true and Statement $$II$$ is false
  • Statement $$I$$ is false and Statement $$II$$ is true
  • Both the statements are true
Monatomic gas among the following at STP is :
  • bromine
  • hydrogen
  • calcium
  • neon
  • nitrogen
What are the missing products of the following reaction? $$\displaystyle { NH }_{ 4 }Cl+{ Ca\left( OH \right)  }_{ 2 }\rightarrow \_ \_ \_ +Ca{ Cl }_{ 2 }$$
  • $$\displaystyle { N }_{ 2 }$$
  • $$\displaystyle { NH }_{ 3 }$$
  • $$\displaystyle { H }_{ 2 }O$$
  • $$\displaystyle { NH }_{ 3 }+{ N }_{ 2 }$$
  • $$\displaystyle { NH }_{ 3 }+{ H }_{ 2 }O$$
The number of valence electrons present in noble gases is:
  • $$6$$
  • $$18$$
  • $$8$$
  • $$4$$
The noble gases which form clathrate compounds:
  • $$Ar$$
  • $$Xe$$
  • $$Kr$$
  • $$Ne$$
Identify the true statement regarding nitrates of all metals.
  • All nitrates decompose to give $$N{ O }_{ 2 }$$
  • All nitrates are soluble in water
  • All nitrates are insoluble in water
  • All nitrates are stable to heat
Formation of $${O}^{-}$$ is ________, whereas formation of $${O}^{-2}$$ is __________.
  • exothermic, endothermic
  • endothermic, exothermic
  • endothermic, endothermic
  • exothermic, exothermic
Nitrogen reacts with a metal $$M$$ to produce a compound $$X$$. This compound $$X$$ when dissolved in water forms pungent gas $$Y$$ which can be identified easily by the formation of white fumes in the presence of $$HCl$$.

Identify Y:
  • Nitrogen dioxide
  • Ammonia
  • Nitrous oxide
  • Nitric oxide
Industrial preparations of $$HN{ O }_{ 3 }$$ by Ostwald's process involves:
  • reduction of $$N{ H }_{ 3 }$$
  • oxidation of $$N{ H }_{ 3 }$$
  • hydrogenation of $$N{ H }_{ 3 }$$
  • hydrolysis of $$N{ H }_{ 3 }$$
Which of the following compounds do not give ammonia on reaction with water?
  • $${ Mg }_{ 3 }{ N }_{ 2 }$$
  • $$AlN$$
  • $$CaC{ N }_{ 2 }$$
  • $$Ca{ \left( CN \right) }_{ 2 }$$
The allotrope of this element is the primary absorber of UV solar radiation in Earth's atmosphere. The element is:
  • carbon
  • nitrogen
  • oxygen
  • neon
  • argon
__________ is a greenish yellow gas having an irritating choking and unpleasant odour.
  • Fluorine
  • Bromine
  • Chlorine
  • Hydrogen sulphide
$$I$$. The ideal gas law can be applied to a sample of xenon at a temperature of $$-{273}^{o}C$$.
$$II$$. Xenon is a noble gas.
  • Statement $$I$$ is true, Statement $$II$$ is true
  • Statement $$I$$ is true, Statement $$II$$ is false
  • Statement $$I$$ is false, Statement $$II$$ is true
  • Statement $$I$$ is true, Statement $$II$$ is true and is a correct explanation of the phenomena described in $$I$$
Statement 1: By mass, oxygen is the most abundant element in the human body.
Statement 2: It is principally found as $$O_2$$ in the bloodstream.
  • Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
  • Both Statement 1 and Statement 2 are correct, but Statement 2 is NOT the correct explanation of Statement 1.
  • Statement 1 is correct, but Statement 2 is not correct.
  • Statement 1 is not correct, but Statement 2 is correct.
Regardless of its electron configuration, the given element must always be paramagnetic when it's a single, neutrally charged atom.
  • Carbon
  • Nitrogen
  • Oxygen
  • Neon
  • Argon
In which of the following choices are the noble gases arranged correctly in order of increasing boiling point?
  • $$Xe, Kr, Ar, Ne$$
  • $$Ne, Ar, Kr, Xe$$
  • $$Kr, Xe, Ne, Ar$$
  • $$Ar, Ne, Kr, Xe$$
What occurs in the minerals of the apatite family?
  • phosphorous
  • arsenic
  • carbon
  • nitrogen
Which selection is the correct formula for the chlorate ion?
  • $${Cl}^{-}$$
  • $$Cl{O}^{-}$$
  • $$Cl{O}_{2}^{-}$$
  • $$Cl{O}_{3}^{-}$$
  • $$Cl{O}_{4}^{-}$$
Which is true regarding nitrogen?
  • Less electronegative
  • Has low ionisation enthalpy
  • d-orbitals are available
  • Ability to form $$p\pi -p\pi$$ bonds with itself
Nitrogen and phosphorus are both in Group 15 of the Periodic Table. Phosphorus forms a chloride with the formula $$P{Cl}_{5}$$ but nitrogen does not form $$N{Cl}_{5}$$.
Which statements help to explain this?
Nitrogen's outer shell cannot contain more than eight electrons.
Nitrogen cannot have an oxidation state of $$+5$$
Nitrogen is less electronegative than phosphorus.
  • 1, 2 and 3 are correct
  • 1 and 2 only are correct
  • 2 and 3 only are correct
  • 1 only is correct
Which of the following order of acidic strength is correct?
  • $$HClO > HClO_{2} > HClO_{3} > HClO_{4}$$
  • $$HClO_{4} > HClO_{2} > HClO_{3} > HClO$$
  • $$HClO_{2} > HClO > HClO_{4} > HClO_{3}$$
  • $$HClO_{4} > HClO_{3} > HClO_{2} > HClO$$
$$N_2(g) + 3H_2(g)\overset{Fe+Mo}{\rightleftharpoons}2NH_3(g)$$; Haber's process.
Mo is used as :
  • a catalyst
  • a catalytic promoter
  • an oxidising agent
  • a catalytic poison
Sea weeds are an important source of :
  • Iron
  • Chlorine
  • Iodine
  • Bromine
For the elements: $$Cl, Br, F, Al, C, Li, Cs$$ & $$Xe$$.
Choose the best option. The element having 8 electrons in the outermost shell is:
  • $$Xe$$
  • $$Cs$$
  • $$Br$$
  • $$C$$
The proof of oxidizing action of hydrogen peroxide in acid solution is in the formation of
  • $$O_2$$
  • $$H_2O$$
  • both $$H_2O$$ and $$O_2$$
  • both $$H_3O^+$$ and $$O_2$$
Which of the following molecule/ion does not exist?
  • $$PCl_6{^-}$$
  • $$ICl_3$$
  • $$BF_4{^-}$$
  • $$XeF_3{^-}$$
Which one of the following noble gases is least polarizable?
  • $$Xe$$
  • $$Ar$$
  • $$Ne$$
  • $$He$$
  • All have equal polarizablilty 
The sublimation of iodine is due to 
  • Low melting point
  • Weak $$I - I$$ Bond
  • Weak van der Waals forces among $$I_2$$ molecules
  • Lone pair - lone pair repulsion in $$I_2$$ molecule
Which of the following bond has highest bond energy?
  • F-F
  • Cl-Cl
  • Br-Br
  • I-I
Fluorine differs from the other halogens due to :
  • Small size
  • Very high electronegativity
  • Non-availability of d-orbitals
  • All of these
Atoms in $$P_4$$ molecule of white phosphorus are  arranged regularly in the following way :
  • at the corners of a cube.
  • at the corners of an octahedron.
  • at the corners of a tetrahedron.
  • at the center and corners of a tetrahedron.
Which of the following is/are correct?
  • Hydrolysis of $$NCl_3$$ gives $$NH_3$$ and $$HClO$$
  • $$NH_3$$ is less stable than $$PH_3$$
  • $$NH_3$$ is a weak reducing agent compared to $$PH_3$$
  • Nitric oxide is paramagnetic
White phosphorus $$(P_4)$$ has :
  • six P-P single bonds
  • four P-P single bonds
  • four lone pairs of electrons
  • PPP angle of $$60^o$$
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