CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 13 - MCQExams.com

Which of the following species do not exist?
  • $$XeF_3$$
  • $$XeF_4$$
  • $$XeF_5$$
  • $$XeF_6$$
If atomic number of inert gas is $$Z$$, then ionic bond is formed between:
  • $$(Z - 1)$$ and $$(Z + 1)$$
  • $$(Z - 2)$$ and $$(Z + 2)$$
  • both (a) and (b)
  • none of these
The following acids have been arranged in the order of decreasing acid strength. Identify the correct order: ClOH (I), BrOH (II), IOH (III).
  • $$I> II > III$$
  • $$II>I>III$$
  • $$III>II>I$$
  • $$I>III>II$$
Which one of the following oxy acid of fluorine exists ?
  • $$HOF$$
  • $$HFO_{3}$$
  • $$HFO_{4}$$
  • $$HFO_{2}$$
The statement, which prompted Neil Bartlett to prepare the first noble gas compound was :
  • $$Xe-F$$ bond has high bond energy
  • $$F_{2}$$ has exceptionally low bond energy
  • $$PtF_{6}$$ is a strong oxidant
  • $$O_{2}$$ molecule and Xe atom have very similar ionization energies.
Write True or false:
Phosphorous occurs as PIts atomicity is 5
P 'its atomicity is 5.
  • True
  • False
The following acids have been arranged in the order of decreasing acid strength. Identify the correct order-
ClOH(I)            BrOH(II)          IOH(III)
  • I > II > III
  • II > I > III
  • III > II > I
  • I > III > II
At high temperature, nitrogen combines with $$CaC_2$$ to give___________.
  • calcium cyanide
  • calcium cyanamide
  • calcium carbonate
  • calcium nitride
Haber's process is a/an:
  • endothermic process
  • exothermic process
  • spontaneous with no heat liberation
  • None
In the commercial preparation of dinitrogen by the liquefaction and fractional distillation,dinitrogen is obtained in:
  • liquid form
  • gaseous form
  • mixture of liquid and gases
  • none
Molecules of noble gases do not possess vibrational energy because, noble gases:
  • are monoatomic
  • are chemically inert
  • have completely filled shells
  • are diatomic
Compound formed on reaction of nitrogen with oxygen at very high temperature is:
  • $$NO_2$$
  • $$N_2O_4$$
  • $$NO$$
  • $$N_2O_3$$
The colour discharge tubes for advertisements mainly contains:
  • argon
  • neon
  • helium
  • xenon
Which mineral was used in isolation of radium?
  • lime stone
  • pitch blende
  • rectile
  • haematite
In gaseous discharge tube,the colour of light emitted by helium is:
  • yellow
  • red
  • blue
  • green
Which of the following noble gas is least polarizable?
  • xenon
  • argon
  • neon
  • helium
Which is most soluble in water at $$293K$$ ?
  • Helium
  • Neon
  • Xenon
  • Krypton
Which of the following has lowest boiling point?
  • Helium
  • Neon
  • Xenon
  • Argon
The force acting between noble gas atoms are:
  • van der Waals force
  • ion-dipole force
  • London dispersion force
  • magnetic force
Inert gases such as helium behave like ideal gases over a wide range of temperature. However they condense into the solid state at very low temperature there is a:
  • Weak attractive forces between the atoms
  • Weak repulsive force between the atoms
  • Strong attractive force between the atoms
  • Strong repulsive force between the atome
Which is called stranger gas?
  • $$Kr$$
  • $$Xe$$
  • $$He$$
  • $$Ne$$
Which of the following is not correct for noble gas?
  • Argon is used in electric bulb.
  • Krypton is obtained during radioactive disintegration.
  • Half life of radon is 3.8 days
  • Helium is used to produce low temperature.
With which of the following halogen, germanium does not form a dihalide?
  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
The electron affinity values for the halogens show the following trends
  • $$F< Cl> Br> I$$
  • $$F< Cl< Br< I$$
  • $$F> Cl> Br> I$$
  • $$F< Cl> Br< I$$
Less ionic compound among the following
  • NaF
  • KCl
  • KF
  • NaCl
Which of the following is NOT changed of Xe in given reaction?
$$2XeO{F}_{4} + Si{O}_{2} \rightarrow 2Xe{O}_{2}{F}_{2}+ Si{F}_{4}$$
  • Hybridisation of Xe
  • Number of d-orbital(s) is hybridisation
  • Number of $$O-Xe-F$$ bond angle
  • Covalency of Xe
Which of the following has $$p\pi -d\pi $$ bonding?
  • $${ NO }_{ 3 }^{ - }$$
  • $${ CO }_{ 3 }^{ - }$$
  • $${ BO }_{ 3 }^{ - }$$
  • $${ SO }_{ 3 }^{ - }$$
Acidic nature of amino group is shown by the reaction :-
  • $$R{ - }{ N }{ H }_{ 2\quad }+NOCL\longrightarrow RCI+{ N }_{ 2 }+{ H }_{ 2 }O$$
  • $$2RN{ H }_{ 2 }+2Na\longrightarrow 2RNH.Na+{ N }_{ 2 }$$
  • $$R.C{ H }_{ 2 }N{ H }_{ 2 }+HN{ O }_{ 2 }+{ N }_{ 2 }+{ H }_{ 2 }{ O }$$
  • $$R.N{ H }_{ 2 }+HCL\longrightarrow RN{ H }_{ 3 }CL$$
$$  { I }_{ 2 }C{ l }_{  6}$$ is formed by the following reaction:

       $$  2IC{ l }_{  3}\rightleftharpoons {I  }_{2  }C{l }_{ 6 }  $$

Based on the structure of $$  {I }_{2  }C{l }_{ 6 }  $$, find the number of atoms lying in one plane.
  • 4
  • 6
  • 8
  • 10
In NaOX , X cannot be:
  • $${ F }_{ 2 }$$
  • $${ Cl }_{ 2 }$$
  • $${ Br }_{ 2 }$$
  • $$I_{ 2 }$$
Select the correct statement (s)
  • HCI and HF do not from free radical easily due to larger bond-energy
  • HI with a minimum bond energy is every reactive and instead from $${{\text{I}}_{\text{2}}}\,\,\,$$
  • Both (a) and (b)
  • None of the above
The oxide of nitrogen responsible for acid rain is:
  • nitrous oxide
  • nitric oxide
  • nitrogen dioxide
  • all of these
The most powerful oxidant among the following is:
  • $$HOCl$$
  • $$HClO_2$$
  • $$HClO_3$$
  • $$HClO_4$$
Which is the best nucleophile in polar solvent?
  • $${ F }^{ - }$$
  • $${ Cl }^{ - }$$
  • $$Br^{ - }$$
  • $$I^{ - }$$
Halogens are placed in which group of elements in modern periodic table.
  • 17
  • 2
  • 4
  • 6
The pair with minimum difference in electronegativity  is :-
  • F,Cl
  • C,H
  • P,H
  • Na,Cs
Number of sigma bonds in $$P_{4}O_{10}$$ is :
  • $$6$$
  • $$7$$
  • $$17$$
  • $$16$$
In Haber process $$30L$$ of Dihydrogen and $$30L$$ of dinitrogen were taken for reaction which yielded only $$50\% $$of the expected product . what will be the composition of gaseous mixture under the aforesaid condition in the end?  
  • $$20L$$ ammonia $$10L$$ nitrogen , $$30L$$ hydrogen
  • $$20L$$ ammonia , $$125L$$ nitrogen , $$25L$$ ydrogen
  • $$20L$$ ammonia , $$20L$$ nitrogen , $$20L$$hydrogen
  • $$10L$$ ammonia , $$25L$$nitrogen , $$15L$$ hydrogen
Which of the following metal on burining in mosist air does not give smell of ammonia?
  • $$Mg$$
  • $$Ca$$
  • $$K$$
  • $$Li$$
Indicate which of the following statement is true or false.
The reaction between hydrogen and nitrogen to form ammonia is reversible.
  • True
  • False
$$P_4$$ is a stable from  of phosphorus. The percentage of p-character in the orbital forming (P - P) bonds in $$P_4$$ is 
  • 25
  • 33
  • 50
  • 75
Which of the following is paramagnetic in nature?
  • NO
  • $$N_2O$$
  • $$N_2O_5$$
  • All of the above
The compound that cannot be formed by Xenon is
  • $$XeO_3$$
  • $$XeF_4$$
  • $$XeCl_4$$
  • $$XeO_2F_2$$
Most reactive nobel gas is : 
  • $$Ar$$
  • $$Xe$$
  • $$He$$
  • $$Ne$$
Lowest oxidation state of phosphorous is in:
  • $${ H_{ 3 } }{ PO }_{ 2 }$$
  • $${ H_{ 3 } }{ PO }_{ 4 }$$
  • $${ H_{ 4 } }{ P_{ 2 }O }_{ 7 }$$
  • $${ H_{ 3 } }{ PO }_{ 3 }$$
$$N_{2}H_{4}+2H_{2}O_{4}\rightarrow 4H_{2}O_2$$. 

This equation suggests the use of $$H_{2}O_{2}$$ as :
  • Bleaching agent
  • Antisepics
  • Restoring colour of old paintings
  • Rocket Propellant
Of the following species, one which is non-existent :
  • $$Xe{F_6}$$
  • $$Xe{F_5}\;$$
  • $$Xe{F_4}$$
  • $$Xe{F_2}$$
Charge on a pseudo halide ion is:
  • $$-1$$
  • $$-2$$
  • $$-3$$
  • $$(1)$$ & $$(2)$$
The electronic configuration of halogen is :
  • $$ns^{2}np^{6}$$
  • $$ns^{2}np^{3}$$
  • $$ns^{2}np^{5}$$
  • $$ns^{2}$$
Two major requirements for preparation of ammonia are
  • Low temperature and high pressure
  • Low temperature and present pressure
  • High temperature and low pressure
  • High temperature and high pressure
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