CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 7 - MCQExams.com

Which of the following is correct for P4P4 molecule of white phosphorus?
  • It has 6 lone pairs of electrons
  • It has six PP single bonds
  • It has three PP single bonds
  • It has four lone pairs of electrons
Maximum number of compounds are known in the case of:
  • neon
  • xenon
  • krypton
  • argon
Ammonia will be obtained in:
  • CaCN2+H2O
  • NH4H2PO4 Heat
  • Both (A) and (B)
  • None
Which of the following statement are correct?
  • All the three NO bond lengths in HNO3 are equal
  • All PCl bond lengths in PCl5 molecule in gaseous state are equal
  • P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive
  • PCl is ionic in solid state in which cation is tetrahedral and anion is octahedral
For NH2OH.HCl+NaNO2(B)Cu(X)gas. Which of the following is correct?
  • (B) is an amphoteric oxide
  • (X) is a colourless, diamagnetic gas which combines with Al on heating
  • (X) can be produced by action of (Zn+NaOH) on NaNO2
  • none of the above
Electron affinity of noble gas element is:
  • very high
  • high
  • low
  • zero
Of the following species, one which is non-existent:
  • XeF6
  • XeF5
  • XeF4
  • XeF2
Which of the following is not correct?
  • XeO3 has four σ and four π bonds.
  • The hybridization of Xe in XeF4 is sp3d2.
  • Among noble gases, the occurrence of argon is highest in air.
  • Liquid helium is used as cryogenic liquid.
In the Ostwald's process for the manufacture of HNO3, the catalyst used is
  • Mo
  • Fe
  • Ni
  • Pt
The fluoride of xenon with zero dipole moment is:
  • XeF6
  • XeOF4
  • XeF4
  • XeO2F2
Xenon form compounds with fluorine under different conditions. The known fluorides are:
  • XeF
  • XeF2
  • XeF4
  • XeF3
Amongs the following which is not member of apatite family
  • Ca9(PO4)6.CaCl2
  • Ca9(PO4)6.CaF2
  • Ca9(PO4)2.Ca(OH)2
  • None of these
Ammonia gas can evolve by heating
  • NaNO3 with zinc dust and sodium hydroxide
  • dry (NH4)2 with dil.  HNO3
  • dry (NH4)2Cr2O7
  • ammonium chloride with lime water
Which of the following names are used for group zero elements?
  • Rare gases of atmosphere
  • Noble gases
  • Inert gases
  • Rare-earths
Which statement(s) is/are correct?
  • Radon is obtained from radium
  • Argon is most abundant noble gas in atmosphere
  • Monazite is a source of gas
  • Helium is present in natural gas
The formation of O+2[PtF6] is the basis for the formation of xenon fluorides. This is because
  • O2 and Xe have comparable sizes
  • Both O2 and Xe are gases
  • O2 and Xe have comparable ionisation energies
  • Both (a) and (c)
Calcium cyanide on treatment with steam under pressure gives NH3 and
  • CaHCO3
  • CaO
  • Ca(OH)2
  • CaCO3
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
Which of the following statement is/are correct?
  • pKa1 of maleic acid is less than pKa1 of fumaric acid.
  • pKa2 of maleic acid is greater than pKa2 of formaric acid.
  • Phthalic acid is a strong acid than isophthalic acid.
  • Isopthalic acid is a strong than terephthalic acid.
Which of the following is a hard acid?
  • Br2
  • Cd2+
  • CO2
  • Fe3+
Fill in the blanks :
Potassium nitrate crystals on heating strongly yield potassium nitrite and ________ gas.
  • oxygen
  • phosphoric
  • nitric acid
  • sulphurous
Point out in which of the following properties oxygen differs from the rest of the members of its family (Group - VIA).
  • High value of ionisation energies
  • Oxidation states (2,4,6)
  • Polymorphism
  • Formation of hydrides
Calcium cyanamide on treatment with steam produce
  • CaCO3+NH3
  • CaHCO3+NH3
  • CaO+NH3
  • Ca(OH)2+NH3
Which is the most abundant element on the earth's crust among group 15 elements?
  • N
  • As
  • P
  • Sb
Ammonia can be obtained by adding water to?
  • Ammonium chloride
  • Ammonium nitrite
  • Magnesium nitride
  • Magnesium nitrate
Nitrogen atom of amino group is ______hybridised.
  • sp
  • sp2
  • sp3
  • sp3d
Which of the following compound does not form pπpπ bond?
  • SO3
  • NO3
  • SO24
  • CO23
Consider the following reactions:
Ax+yB2limitedsupplyofaircompoundP+zB2excessairCompoundQ
If atomic number of elements A and B are 15 and 8 respectively, then according to the given information the correct statement(s) is/are:
  • (BAB) bond angle in compound Q>(BAB) bond angle in compound 'P'
  • (AB) bond length in compound Q<(AB) bond length in compound 'P'
  • Value of x+y+z is 9
  • Compound 'P' is P2O5 and compound 'Q' is P4O10.
Oxygen gas is not produced from the following decomposition reaction :
  • K2Cr2O7Δ
  • Ag2C2O4Δ
  • Pb(NO3)2Δ
  • Ag2CO3Δ
Which of the following catalyst is used in the Haber's process for the manufacture of ammonia?
  • Platinized asbestos
  • Iron with a suitable promoter
  • Copper oxide
  • Alumina
A solution containing Br ions is treated with each of the following. Which of these will not liberate bromine gas (in acidic medium) ?
  • Cl2
  • HI
  • I2
  • SO3
Which is soluble in water :
  • AgCl
  • AgBr
  • AgI
  • AgF
An element with variable (more than one) valency stored under water is:
  • silicon
  • iron
  • phosphorus
  • gold
An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell. The element X is :
  • nitrogen
  • oxygen
  • phosphorous
  • sulphur
Phosphide and phosphate ions are:
  • PO34 and P3
  • P3 and PO34
  • PO43 and P4
  • P4 and PO43
The steps for the manufacture of nitric acid by Ostwald process are given. Arrange them in sequence.
(a) Recirculation of nitric oxide
(b) Addition of H2O to nitrogen dioxide
(c) Oxidation of nitric oxide.
(d) Catalytic oxidation of ammonia
  • d c b a
  • d c a b
  • c d b a
  • c d a b
Nitrogen can exhibit which of the following oxidation states:
  • +1
  • +2
  • +3
  • all of the above
The ions Mg+2 and PO34 combine to form compounds:
  • Mg3(PO4)2
  • Mg2(PO4)2
  • Mg2(PO4)3
  • Mg3(PO4)3
Magnesium on heating to redness in an atmosphere of N2 and then on treating with H2O gives?
  • NH3
  • H2
  • N2
  • O2
The elements with atomic numbers 9, 17, 35, 53 and 85 belong to noble gases columnz__________.
  • True
  • False
NH3 (Ammonia) has __________shape.
  • rectangular
  • pyramidal
  • trigonal-bi-pyramidal
  • planar
Nitrogen is liberated by the thermal decomposition of only :
  • NH4NO2
  • NaN3
  • (NH4)2Cr2O7
  • All of these
Which of the following belongs to the halogen family?
  • Francium
  • Polonium
  • Radium
  • Astatine
At low temperatures, nitrogen:
  • is poisonous
  • is highly soluble in water
  • can be liquefied on compression
  • dissociates to form nascent nitrogen
Single NN bond is weaker than the single PP bond. This is because of:
  • larger NN bond length in comparison to PP bond length
  • high interelectronic repulsion of the non-bonding electrons, owing to the small NN bond length in comparison to that in PP single bond
  • higher electronegativity of N in comparison to P
  • smaller atomic size of N as compared to that of P
PCl5 molecule has:
  • three fold axis of symmetry
  • two fold axis of symmetry
  • both A and B
  • none of these
________ bacteria are microbes that work in the absence of oxygen.
  • Anaerobic
  • Aerobic
  • Gram-positive 
  • Gram-negative
The compound IF7 is named as Iodine heptafluoride.
  • True
  • False
Hydride of nitrogen is called :
  • Hydrogen sulphide
  • Water
  • Ammonia
  • Nitrous oxide
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 compound X.
  • Iron nitride
  • Calcium nitride
  • Nitrolim
  • Sodium nitride
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