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

Which of the following is correct for $$P_4$$ molecule of white phosphorus?
  • It has 6 lone pairs of electrons
  • It has six $$P-P$$ single bonds
  • It has three $$P-P$$ 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:
  • $$CaCN_2 +H_2O \to $$
  • $$NH_4H_2PO_4 \ \xrightarrow {Heat}$$
  • Both (A) and (B)
  • None
Which of the following statement are correct?
  • All the three $$N-O$$ bond lengths in $$HNO_3$$ are equal
  • All $$P-Cl$$ bond lengths in $$PCl_5$$ molecule in gaseous state are equal
  • $$P_4$$ 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 $$NH_2OH.HCl +NaNO_2 \to (B)  \xrightarrow {Cu} (X)_{gas}$$. 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 $$NaNO_2$$
  • 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:
  • $$XeF_6$$
  • $$XeF_5$$
  • $$XeF_4$$
  • $$XeF_2$$
Which of the following is not correct?
  • $$XeO_3$$ has four $$\sigma$$ and four $$\pi$$ bonds.
  • The hybridization of $$Xe$$ in $$XeF_4$$ is $$sp^3d^2$$.
  • 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 $$HNO_{3}$$, the catalyst used is
  • Mo
  • Fe
  • Ni
  • Pt
The fluoride of xenon with zero dipole moment is:
  • $$XeF_6$$
  • $$XeOF_4$$
  • $$XeF_4$$
  • $$XeO_2F_2$$
Xenon form compounds with fluorine under different conditions. The known fluorides are:
  • $$XeF$$
  • $$XeF_{2}$$
  • $$XeF_{4}$$
  • $$XeF_{3}$$
Amongs the following which is not member of apatite family
  • $$ Ca_{9}(PO_{4})_{6}.CaCl_{2} $$
  • $$ Ca_{9}(PO_{4})_{6}.CaF_{2} $$
  • $$ Ca_{9}(PO_{4})_{2}.Ca(OH)_{2} $$
  • None of these
Ammonia gas can evolve by heating
  • $$ NaNO_{3} $$ with zinc dust and sodium hydroxide
  • dry $$(NH_{4})_{2}$$ with dil.  $$ HNO_{3} $$
  • dry $$(NH_{4})_{2}Cr_{2}O_{7} $$
  • 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 $$O_2^+[PtF_6]^-$$ is the basis for the formation of xenon fluorides. This is because
  • $$O_2$$ and $$Xe$$ have comparable sizes
  • Both $$O_2$$ and $$Xe$$ are gases
  • $$O_2$$ and $$Xe$$ have comparable ionisation energies
  • Both (a) and (c)
Calcium cyanide on treatment with steam under pressure gives $$NH_{3}$$ and
  • $$CaHCO_3$$
  • $$CaO$$
  • $$Ca(OH)_{2}$$
  • $$CaCO_{3}$$
In which of these processes platinum is used as a catalyst? 
  • Oxidation of ammonia to form $$ HNO_3 $$
  • Hardening of oils
  • Production of synthetic rubber
  • Synthesis of methanol
Which of the following statement is/are correct?
  • $$ pK_{a1} $$ of maleic acid is less than $$ pK_{a1} $$ of fumaric acid.
  • $$ pK_{a2} $$ of maleic acid is greater than $$ pK_{a2} $$ 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?
  • $$ Br_2 $$
  • $$ Cd^{2+} $$
  • $$ CO_2 $$
  • $$ Fe^{3+} $$
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
  • $$CaCO_{3}+NH_{3}$$
  • $$CaHCO_{3}+NH_{3}$$
  • $$CaO+NH_{3}$$
  • $$Ca(OH)_{2}+NH_{3}$$
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.
  • $$sp$$
  • $$sp^2$$
  • $$sp^3$$
  • $$sp^3d$$
Which of the following compound does not form $$p \pi - p \pi$$ bond?
  • $$SO_{3}$$
  • $$NO_{3}^{-}$$
  • $$SO_{4}^{2-}$$
  • $$CO_{3}^{2-}$$
Consider the following reactions:
$$A_{x} + yB_{2} \xrightarrow [supply \,of \,air]{limited} compound \,'P' \xrightarrow [excess \,air]{+zB_{2}} Compound \,'Q' $$
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:
  • $$(B-A-B)$$ bond angle in compound $$'Q' > (B-A-B)$$ bond angle in compound 'P'
  • $$(A-B)$$ bond length in compound $$'Q' < (A-B)$$ bond length in compound 'P'
  • Value of $$x + y + z$$ is $$9$$
  • Compound 'P' is $$P_{2}O_{5}$$ and compound 'Q' is $$P_{4}O_{10}.$$
Oxygen gas is not produced from the following decomposition reaction :
  • $$K_2Cr_2O_7 \xrightarrow{\Delta}$$
  • $$Ag_2C_2O_4 \xrightarrow{\Delta}$$
  • $$Pb(NO_3)_2 \xrightarrow{\Delta}$$
  • $$Ag_2CO_3 \xrightarrow{\Delta}$$
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) ?
  • $$Cl_{2}$$
  • $$HI$$
  • $$I_{2}$$
  • $$SO_{3}$$
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:
  • $$PO_{4}^{3-}$$ and $$P^{3-}$$
  • $$P^{3-}$$ and $$PO_{4}^{3-}$$
  • $$PO_{3}^{4-}$$ and $$P^{4-}$$
  • $$P^{4-}$$ and $$PO_{3}^{4-}$$
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 $$H_2O$$ 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 $$PO_{4}^{-3}$$ combine to form compounds:
  • $$Mg_3(PO_4)_2$$
  • $$Mg_2(PO_4)_2$$
  • $$Mg_2(PO_4)_3$$
  • $$Mg_3(PO_4)_3$$
Magnesium on heating to redness in an atmosphere of $$N_{2}$$ and then on treating with $$H_{2}O$$ gives?
  • $$NH_{3}$$
  • $$H_{2}$$
  • $$N_{2}$$
  • $$O_{2}$$
The elements with atomic numbers 9, 17, 35, 53 and 85 belong to noble gases columnz__________.
  • True
  • False
$$NH_{3}$$ (Ammonia) has __________shape.
  • rectangular
  • pyramidal
  • trigonal-bi-pyramidal
  • planar
Nitrogen is liberated by the thermal decomposition of only :
  • $$NH_4NO_2$$
  • $$NaN_3$$
  • $$(NH_4)_2Cr_2O_7$$
  • 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 $$N-N$$ bond is weaker than the single $$P-P$$ bond. This is because of:
  • larger $$N-N$$ bond length in comparison to $$P-P$$ bond length
  • high interelectronic repulsion of the non-bonding electrons, owing to the small $$N-N$$ bond length in comparison to that in $$P-P$$ single bond
  • higher electronegativity of $$N$$ in comparison to $$P$$
  • smaller atomic size of $$N$$ as compared to that of $$P$$
$$PCl_5$$ 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 $$IF_7$$ 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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