CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 1 - MCQExams.com

Which of the following elements belongs to halogen group? 
  • $$ 1s^2 , 2s^2 , 2p^6 ,3s^2, 3p^5 $$
  • $$ 1s^2 , 2s^2 , 2p^6, 3s^2 , 3p^6 , 4s^2 $$
  • $$ [Ar], 3d^{10},4s^2 ,4p^5 $$
  • $$ [Kr], 4d^{10} , 5s^2, 5p^5 $$
In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle filling of a new energy shell. In accordance with the Aufbau principle, the seven period (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f - block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
The elements with atomic number $$35,53$$ and $$85$$ are all ________.
  • Noble gases
  • Halogens
  • Heavy metals
  • Light metals
The elements with atomic numbers 10, 18, 36, 54 and 86 are all: 
  • light metals
  • inert gases
  • halogens
  • rare-earths
Which of the block of elements does belong to inert gases?
  • s-block
  • p-block
  • d-block
  • f-block
A certain element forms a solid oxide which dissolves in water to form an acidic solution. The element is:
  • $$S$$
  • $$Mg$$
  • $$Na$$
  • $$P$$
Which of the following statements is correct?
  • All halogens form oxyacids
  • Only chlorine and bromine form oxyacids
  • All halogens except fluorine form oxyacids
  • Only iodine forms oxyacid
A radioactive halogen is: 
  • polonium
  • radon
  • astatine
  • iodine
How many electrons are present in the outermost orbit of halogens?
  • 1
  • 3
  • 5
  • 7
Halogens show usually: 
  • Electro-valency
  • Covalency
  • Both electrovalency and covalency
  • Coordinate valency
The outermost electronic configuration of the most electronegative element is: 
  • $$ ns^2np^3 $$
  • $$ ns^2 np^4 $$
  • $$ ns^2 np^5 $$
  • $$ ns^2 np^6 $$
Radon is a:
  • drug
  • explosive
  • trade name of nylon
  • noble gas
Noble gases are chemically inactive because of:
  • mono-atomic nature
  • low boiling points
  • closed valency shell
  • rare occurrence
Which of the following represents the outermost shell electronic configuration of halogens?
  • $$ns^2np^3$$
  • $$ns^2np^6$$
  • $$ns^2 np^4$$
  • $$ns^2np^5$$
White Phosphorus contains
  • $$P_5$$ molecules
  • $$P_4$$ molecules
  • $$P_6$$ molecules
  • $$P_2$$ molecules
Wilhem  Ostwald redefined action of
  • Anamers
  • Isomers
  • Catalyst
  • Geometry of monomers
Which of the following are correct?
  • $$XeO_3$$ has four $$\sigma$$ and four $$\pi$$ bonds
  • The hybridization of $$Xe$$ in $$sp^3d^2$$
  • Among the noble gases, the occurrence of argon is highest in the air
  • Liquid helium is used in cryogenic liquids
Which of the following pairs are correctly matched?
  • A halogen which is liquid at room temperature - Bromine
  • The most electronegative element- Fluorine
  • The halogen having highest electron affinity- Chlorine
  • The strongest oxidising agent -Iodine
An interhalogen compound is :
  • $$I_3^-$$
  • $$(CN)_2$$
  • $$BrF_3$$
  • $$N_3H$$
Ammonia gas is not prepared by
  • reduction of sodium nitrite or sodium nitrate by the reaction of Zinc dust and sodium hydroxide.
  • hydrolysis of calcium cyanamide.
  • heating ammonium chloride with slaked lime
  • heating of $$ (NH_{4})_{2}Cr_{2}O_{7} $$
Atoms in a $$P_4$$ molecules of white phosphorus are arranged regularly in space in which of the following way
  • at the corners of tetrahedron
  • at the corners of a cube
  • at the corners of a four membered ring
  • at the centre and corners of an equilateral triangle
Which inert gas having highest boiling point?
  • $$Xe$$
  • $$Ar$$
  • $$Kr$$
  • $$He$$
Every noble gas atom 
  • has a saturated outermost shell
  • has one electron in outermost shell
  • has eight electrons is outer shell
  • has two electrons in outermost shell
Which statement is not correct for nitrogen?
  • It has a small size
  • It does not radily react with $$O_2$$
  • It is a typical non-metal
  • $$d$$ - orbitals are available for bonding
Which of the following substances when boiled with caustic sodasolution will evolve ammonia
  • Ethylamine
  • Aniline
  • Acetamide
  • Acetoxime
The last member of Group 18 is
  • Helium
  • Neon
  • Argon
  • Radon
Which of the following inert gas liquifies easily?
  • $$Kr$$
  • $$He$$
  • $$Ne$$
  • $$Ar$$
Oxygen molecule exists in the form of three molecules as $$O_2, O_3$$ and $$O_4$$.
  • True
  • False
The atoms of which of the following pair of element are most likely to exist in free state ? 
  • Hydrogen and Helium
  • Argon and Carbon
  • Neon and Nitrogen
  • Helium and Neon
Which compounds is prepared by the following reaction:
$$\underset { (2:1\ volume \ ratio) }{ Xe+F_{2} }\xrightarrow [ 673\ K ]{ Ni } $$ 
  • $$XeF_{4}$$
  • $$XeF_{2}$$
  • $$XeF_{6}$$
  • None of these.
The incorrect statement regarding $$15^{th}$$ group hydrides $$(EH_{3}) . [E = N, P, As, Sb, Bi]$$
  • $$NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3} :$$ Thermal stability
  • $$N - H > P - H > As - H > Sb - H > Bi - H : E - H$$ bond dissociation enthalpy
  • $$NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3} :$$ Reducing character
  • $$NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3} :$$ Basicity
$$X - O - X$$ bond (where X = central atom) is not present in species.
  • $$Cl_{2}O_{7}$$
  • $$H_{2}N_{2}O_{2}$$
  • $$N_{2}O_{5}$$
  • $$H_{2}S_{2}O_{7}$$
Which of the following oxy anion(s) contain $$P - O$$ bond order equal to $$1.5$$ ?
  • $$H_{2}P_{2}O_{6}^{2-}$$
  • $$H_{2}PO_{3}^{-}$$
  • $$H_{2}PO_{4}^{-}$$
  • $$H_{2}PO_{2}^{-}$$
$$Xe+F_2 \xrightarrow{1:20} X \xrightarrow{H_2O} Y \xrightarrow{H_2O} Z \xrightarrow{H_2O} XeO_3$$
Select correct option(s) for X, Y, Z and given chemical change :
  • X, Y and Z are in same oxidation state
  • All have equal number of lone pair on central atom
  • All are non-planar
  • All have equal number of covalent bonds
In the synthesis of sodium carbonate by solvay (or ammonia-soda) process, the recovery of ammonia is done by treating $$NH_4Cl$$ with $$Ca(OH)_2$$. The by-product obtained in this process is:
  • $$CaCl_2$$
  • $$NaCl$$
  • $$NaOH$$
  • $$NaHCO_3$$
In spite of having less electron affinity than chlorine, fluorine is the strongest oxidizing agent among the halogens. The most important reason for this phenomenon is :
  • lower bond dissociation energy of $$F_{2}$$ than $$Cl_{2}$$
  • much lower heat of hydration of $$F^-$$ than $$Cl^-$$
  • much greater heat of hydration of $$F^-$$ than $$Cl^-$$
  • greater electronegativity of $$F$$ than $$Cl$$
Which of the following arrangement of bond dissociation enthalpy of halogens is correct?
  • $$F-F>Cl-Cl>Br-Br$$
  • $$F-F< Cl-Cl < Br-Br$$
  • $$F-F > Cl-C l< Br-Br$$
  • $$F-F < Cl-Cl > Br-Br$$
Bleaching powder and bleach solution are produced on a large scale and is used in several house-hold products. The effectiveness of bleach solution is often measured by iodometry. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is:
  • $$Cl_{2}O$$
  • $$Cl_{2}O_{7}$$
  • $$ClO_{2}$$
  • $$Cl_{2}O_{6}$$
  • $$Cl_2O_3$$
  • $$Cl_2O_5$$
  • $$Cl_3O_9$$
The products of complete hydrolysis of $$XeF_{4}$$ are :
  • $$XeO_{3}$$
  • $$Xe$$
  • $$HF$$
  • $$XeO_{4}$$
In the molecule $$XeO_{2}F_{2}$$, there exists one $$n$$-fold axis of symmetry and in the molecule $$XeO_{2}F_{4}$$, the number of $$2$$-fold axis of symmetry is $$m$$. The value of $$m + n$$ is :
  • $$6$$
  • $$7$$
  • $$8$$
  • $$5$$
Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of :
  • $$NO$$
  • $$NO_{2}$$
  • $$N_{2}O$$
  • $$N_{2}O_{4}$$
$$XeF_2$$ reacts with $$PF_5$$ to give:
  • $$XeF_6$$
  • $$[XeF]^+ [PF_6]^-$$
  • $$XeF_4$$
  • $$[PF_4]^+ [XeF_3]^-$$
Which of the following reactions does not produce ammonia as one of the products?
  • $$Mg_3N_2 + H_2O\rightarrow$$ Products
  • $$(NH_4)_2SO_4 + CaO \rightarrow$$ Products
  • $$NaNO_2 + Zn\xrightarrow{NaOH}$$ Products
  • $$NH_4NO_3 \xrightarrow[ ]{\Delta }$$ Products
Ammonia can be dried by :
  • conc. $$H_2SO_4$$
  • $$P_4O_{10}$$
  • $$CaO$$
  • $$CaCl_2$$
Which of the following set of elements have the strongest tendency to form anions?
  • N, O and F
  • P, S and Cl
  • N, P and Cl
  • N, P and S
Ammonia gas is not prepared by :
  • reduction of sodium nitrite or sodium nitrate by the reaction of zinc dust and sodium hydroxide
  • hydrolysis of calcium cyanamide
  • heating ammonium chloride with slaked lime
  • heating of $$(NH_4)_2Cr_2O_7$$
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 the metal $$M$$.
  • Calcium
  • Sodium
  • Cobalt
  • Iron
The reaction of $$XeF_6$$ with silica $$(SiO_2)$$ gives:
  • $$XeO_3$$ and $$SiF_4$$
  • $$XeF_4$$ and $$SiF_4$$
  • $$XeOF_2$$ and $$SiF_4$$
  • $$XeOF_4$$ and $$SiF_4$$
Which of the following molecule doesn't have $$d\pi -p\pi$$ bonding?
  • $$SO_2$$
  • $$P_4O_{10}$$
  • $$H_3PO_4$$
  • $$B_3N_3H_6$$
Which of the following do not exist?
  • $$\displaystyle\:SH_{6}$$
  • $$\displaystyle\:HFO_{4}$$
  • $$\displaystyle\:FeI_{3}$$
  • $$\displaystyle\:HClO_{3}$$
The pair(s) that yield(s) the same gaseous product on reaction with water is/are :
  • $$AlN$$ and $$CaCN_2$$
  • $$Ca$$ and $$CaH_2$$
  • $$F_2$$ and $$XeF_4$$
  • $$K$$ and $$KO_2$$
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