CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 5 - MCQExams.com

Mono atomic element among the following is:
  • phosphorus
  • oxygen
  • krypton
  • sulphur
The inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total $$p-$$ and $$s-$$electrons, is:
  • $$He$$
  • $$Ne$$
  • $$Ar$$
  • $$Kr$$
Which of the following sets of atomic numbers belongs to chalcogens?
  • 8, 52, 84
  • 9, 17, 35
  • 20, 37, 56
  • 14, 32, 50
According to Coulson the high reactivity of fluorine than other halogens is because of its:
  • high electronegativity
  • lesser internuclear repulsions
  • greater repulsions between non bonding electrons
  • All the above
Elements with atomic numbers 9, 17, 35, 53 are collectively known as:
  • chalcogens
  • halogens
  • lanthanides
  • rare gases
The inert gas present in the second long period is:
  • $$Kr$$
  • $$Xe$$
  • $$Ar$$
  • $$Rn$$
The outer most electronic configuration of the most electronegative element is:
  • $$\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{3}$$
  • $$\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{4}$$
  • $$\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{5}$$
  • $$\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{6}$$
Which of the following does not contain fluorine?
  • Fluorspar
  • Cryolite
  • Flouorospatite
  • Chile saltpeter
Which of the following exist?
  • $$ICl_{3}$$ 
  •  $$ ClF_{3}$$
  • $$IF_{7}$$ 
  • $$BrF_{3}$$
Fluorine is highly reactive because:
  • F-F bond energy is high
  • F-F bond energy is low
  • it is gaseous at room temperature
  • F has a smaller size
Which of the following statements is not correct?
  • All halogens except flourine from OXO-acids
  • Hypohalous acids HOCI,HOBr and HOI are all strong acids
  • Hypochlorous acid is the most stable among hypohalous acids
  • Chlorous acid is the only halous acid known
The lightest gas which is non-inflammable is:
  • $${H}_{2}$$
  • $$ He $$
  • $${N}_{2}$$
  • $${A}$$r
The atomic number of astatine which belongs to the sixth period is:
  • 53
  • 54
  • 85
  • 86
$$Al+X\overset{\Delta}{\rightarrow} Y \overset{H_{2}O}{\rightarrow} Z+NH_{3}$$
Here $$X, Y$$ and $$Z$$ are respectively:
  • $$O_{2}, \; Al_{2}O_{3}, \; Al(OH)_{3}$$
  • $$N_{2}, \; AlN, \; Al_{2}O_{3}$$
  • $$N_{2}, \; AlN, \; Al(OH)_{3}$$
  • $$CO_{2}, \; Al_{4}C_{3}, \; CH_{4}$$
The inert gas which cannot be adsorbed over activated coconut charcoal?
  • Ne
  • Ar
  • He
  • Kr
Which of the following halogens does not form oxyacids at room temperature?
  • $$\mathrm{F}_{2}$$
  • $$ \mathrm{Cl}_{2}$$
  • $$\mathrm{B}\mathrm{r}_{2}$$
  • $$I_{2}$$
A degenerate gas is :
  • He
  • $$\mathrm{O}_{2}$$
  • He(ll)
  • $$\mathrm{H}\mathrm{e}_{2}$$
The atomic weight of noble gases is obtained by using the relationship :
  • Atomic weight = equivalent weight X valency
  • Atomic weight = equivalent weight/valency
  • At. weight = valency/equivalent weight
  • 2 x V.D. = molecular weight = atomic weight
To prepare $$XeF_6$$ at 573 K, 50-60 atm pressure, the ratio of xenon and fluorine used is :
  • 1 : 2
  • 1 : 5
  • 1 : 20
  • 10 : 1
The correct order of enthalpy of vaporisation of noble gases is :
  • $$ He < Ne < Ar < Kr < Xe $$
  • $$ He > Ne > Ar > Kr > Xe$$
  • $$ He < Ar < Kr < Ne < Xe $$
  • $$ He < Xe < Ar < Ne < Kr $$
Assertion (A): Balloons made by nylon films are better for containing helium than the conventional rubber balloons. 
Reason (R): R.M.S. velocity of helium is very high. So helium atoms can effuse out through rubber balloons.
  • Both $$A$$ and $$R$$ are correct and $$R$$ is the correct explanation of $$A$$.
  • Both $$A$$ and $$R$$ are correct and $$R$$ is not the correct explanation of $$A$$.
  • $$A$$ is true but $$R$$ is false.
  • $$A$$ is false but $$R$$ is true.
Compounds formed when the noble gases get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are known as :
  • Interstitial compounds
  • Clathrates
  • Hydrates
  • Picrates
The number of steps involved in the manufacturing of nitric acid through Ostwald's process is:
  • 1
  • 5
  • 3
  • 6
The correct statement (s) regarding, $$\left( i \right)\,\,HClO\,\,\left( {ii} \right)\,\,\,HCl{O_2}\,\,\,\,\left( {iii} \right)\,\,\,HCl{O_3}$$ and $$\left( {iv} \right)\,\,\,HCl{O_4}$$, is:
  • The number of $$Cl=O$$ bond in $$(ii)$$ and $$(iii)$$ together is two.
  • The numbers of lone pairs of electrons on $$Cl$$ in $$(ii)$$ and $$(iii)$$ together is three.
  • The hybridization of $$Cl$$ in $$(iv)$$ is $$s{p^3}$$.
  • Amongst $$(i)$$ to $$(iv)$$, the strongest acid is $$(i)$$.
Which type of interaction is involved in the solubility of noble gas in water?
  • Instantaneous dipole induced dipole interacation
  • Dipole-dipole ineteractions
  • Dipole-induced dipole interaction
  • Ion-diplole interactions
Which of the following species is most unstable?
  • $$Li^-$$
  • $$N^-$$
  • $$C^-$$
  • $$O^-$$
Which of the following halogen form only one oxyacids (HOX)?
  • $$F$$
  • $$Br$$
  • $$I$$
  • $$Cl$$
Which of the following noble gases can be called the hidden one?
  • $$Xe$$
  • $$He$$
  • $$Ar$$
  • $$Kr$$
$${\text{Xe}}{{\text{F}}_{\text{6}}}$$ on partial hydrolysis with water produces a compound 'X'. The same compound 'X' is formed when  $${\text{Xe}}{{\text{F}}_{\text{6}}}$$ reacts with silica. The compound 'X' is:
  • $${\text{Xe}}{{\text{F}}_2}$$
  • $$\,\,{\text{Xe}}{{\text{F}}_4}$$
  • $$\,\,{\text{XeO}}{{\text{F}}_4}$$
  • $$\,\,{\text{Xe}}{{\text{O}}_3}$$
In which of the following pairs, the second atom is larger than the first? 
  • $$N,\ P$$
  • $$Br,\ Cl$$
  • $$Ba,\ Sr$$
  • $$Mg,\ Al$$
Which of the following substance produces oxygen on heating? 
  • Potassium Permanganate
  • Potassium Iodide
  • Potassium chloride
  • Potassium hydroxide
In the manufacture of nitric acid by Ostwald's process, ___________ as a dehydrating agent is used to convert 68% by mass of $$HNO_3$$ to 98% by mass of $$HNO_3$$.
  • $$H_2SO_4$$
  • Anhydrous $$CaCl_2$$
  • Hot $$Al_2O_3$$
  • None of these
Which of the following compound does not liberate ammonia gas on refluxing with aqueous NaOH?
A nitrate which on heating liberates oxygen as the only gaseous product is: 
  • $${ NaNO }_{ 3 }$$
  • $$Mg{ \left( NO_{ 3 } \right) }_{ 2 }$$
  • $${ AgNO }_{ 3 }$$
  • $$Pb\left( { NO }_{ 3 } \right) _{ 2 }$$
Which of the following has highest chlorine content ?
  • Pyrene
  • DDT
  • Chloral
  • Gammaxene
 To dry ammonia gas the drying agent used is:
  • anhydrous $$CaCl_2$$
  • concentrated $$H_2SO_4$$
  • $$P_4O_{10}$$
  • $$CaO$$
The nomenclature of $$ICl$$ is iodine chloride because: 
  • Size of $$I$$ < Size of $$Cl$$
  • Atomic number of $$I$$ > Atomic number of $$Cl$$
  • E.N. of $$I$$ < E.N. of $$Cl$$
  • E.A of $$I$$ < E. A. of $$Cl$$
Which of the following is a tetratomic solid?      
  • Phosphorous
  • Nitrogen 
  • Potassium
  • Calcium
Which of the following compound on heating does not give ammonia?
  • $$( \mathrm { NH }_4 )_2 \mathrm { SO_4 }$$
  • $$( \mathrm { NH }_4 )_2 \mathrm { CO_3 }$$
  • $$( \mathrm { NH }_4 \mathrm { NO_3 }$$
  • $$NH_4Cl$$
Ammonia can be obtained by adding water to:
  • ammonium chloride
  • ammonium nitrite
  • magnesium nitride
  • magnesium nitrate
Natural gas is a major feed stock for the production of ________
  • Ammonia
  • potassium
  • sodium
  • phosphorus
The non-existent species is
  • $$XeF_4$$
  • $$BrF_4$$
  • $$SbF_5$$
  • $$PF_5$$
Both N(Si$${ H }_{ 3 })_{ 3 }$$ and $$NH(SiH_{ 3 })_{ 2 }$$ compounds have trigonal planar skeleton. Incorrect statement about both compounds is:  
  • SiNSi bond angle in $$NH(SiH_{ 3 })_{ 2 }$$ >SiNSi bond angle in $$N(SiH_{ 3 })_{ 3 }$$
  • N-Si bond length in $$NH(SiH_{ 3 })_{ 2 }$$ > N-Si bond length in $$N(SiH_{ 3 })_{ 3 }$$
  • N-Si bond length in $$NH(SiH_{ 3 })_{ 2 }$$ < N-Si bond length in n$$N(SiH_{ 3 })_{ 3 }$$
  • Back bonding strength in $$NH(SiH_{ 3 })_{ 2 }$$ > Back bonding strength in $$N(SiH_{ 3 })_{ 3 }$$
White and yellow phosphorous are:
  • Allotropes
  • Isomers
  • Isobars
  • Isotones
Most energetic species among the following is:
  • $$H _ { 2 }$$
  • $$Ne$$
  • $$F$$
  • $$F _ { 2 }$$
Greater reactivity of $$ F_2 $$ is not due to____
  • low energy of F-F bond
  • small size
  • high heat of hydration
  • high energy of F-F bond
White and yellow phosphorus are - 
  • Allotropes
  • Isomoers
  • Isobars
  • Isotones
In $$XeF_2\cdot2SbF_5$$
  • F is forming bridge between Xe and Sb
  • There are two Xe-F bonds with bond lengths $$184$$ pm and $$235$$ pm
  • Both $$1)$$ and $$2)$$ are correct
  • Neither $$1)$$ or $$2)$$ is correct
White phosphorus on reaction with concentrated $$NaOH$$ solution in an inert atmosphere of $${CO}_{2}$$ gives phosphine and compound $$(X)$$. $$(X)$$ on acidification with $$HCl$$ gives compound $$(Y)$$. The basicity of compound $$(Y)$$ is :
  • $$4$$
  • $$3$$
  • $$1$$
  • $$2$$
Very pure $$N_{2}$$ can be obtained by:
  • Thermal decomposition of ammonium dichromate
  • Treating aqueous solution of $$NH_{4}Cl$$ and $$NaNO_{2}$$
  • Liquifaction and fractional distillation of liquid air
  • Thermal decomposition of sodium azide
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