CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 2 - MCQExams.com

Industrial preparations of $$HNO_{3}$$ by Ostwald's process involves:
  • reduction of $$NH_{3}$$
  • oxidation of $$NH_{3}$$
  • hydrogenation of $$NH_{3}$$
  • hydrolysis of $$NH_{3}$$
Choose correct squence for the following species.
  • $$F_{2} > Cl_{2} > Br_{2} > I_{2} $$(Reducing power)
  • $$Cl_{2}< F_{2} < Br_{2} < I_{2}$$ (Reactivity)
  • $$I_{2} > Br_{2} > F_{2}> Cl_{2}$$(Bond length)
  • $$Cl_{2} > Br_{2} >F_{2} >I_{2}$$ (Bond dissociation enthalpy)
A solution of colorless salt H on boiling with excess NaOH produces a non-flammable gas. The gas evolution ceases after sometime upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt(s) H is(are) :
  • $$NH_4NO_3$$
  • $$NH_4NO_2$$
  • $$NH_4Cl$$
  • $$(NH_4)_2SO_4$$
Which of the following reaction represents the balanced form of conversion of Ca to ammonia?
  • $${ 2NH }_{ 4 }Cl+Ca\left( OH \right) _{ 2 }\xrightarrow { \triangle } { CaCl }_{ 2 }+{ 2H }_{ 2 }O+{ 2NH }_{ 3 }$$
  • $${ NH }_{ 4 }Cl+Ca\left( OH \right) _{ 2 }\xrightarrow { \triangle } { CaCl }_{ 2 }+{ 2H }_{ 2 }O+{ NH }_{ 3 }$$
  • $${ 2NH }_{ 4 }Cl+3Ca\left( OH \right) _{ 2 }\xrightarrow { \triangle } 3{ CaCl }_{ 2 }+{ 2H }_{ 2 }O+{ 2NH }_{ 3 }$$
  • $${ 4NH }_{ 4 }Cl+Ca\left( OH \right) _{ 2 }\xrightarrow { \triangle } 2{ CaCl }_{ 2 }+{ 2H }_{ 2 }O+{ 2NH }_{ 3 }$$
The solubility of iodine in carbon tetrachloride is due to
  • Ionic solvent-solute interaction
  • Charge-transfer phenomenon
  • Van der Waals interaction
  • Dissociation of iodine
Which one of the following arrangements does not give the correct picture of the trends indicated against it?
  • $$F_2 > Cl_2 > Br_2 > I_2$$: Bond dissociation energy
  • $$F_2 > Cl_2 > Br_2 > I_2$$: Electronegativity
  • $$F_2 > Cl_2 > Br_2 > I_2$$: Oxidizing nature
  • $$F_2 > Cl_2 > Br_2 > I_2$$: Electron gain enthalpy
The boiling points of neon and krypton are $$ -245.{ 9 }^{ \circ  }C$$ and $$ -152.{ 9 }^{ \circ  }C$$ respectively. Using these data estimate the boiling point of argon. (report answer as the negative of the closest integer)
  • $$-289^oC$$
  • $$-299^oC$$
  • $$-199^oC$$
  • $$-189^oC$$
The high oxidising power of fluorine is due to its :
  • high electron affinity.
  • high heat of dissociation and low heat of hydration.
  • low heat of dissociation and high heat of hydration.
  • high heat of dissociation and high heat of hydration.
The Haber process can be represented by the following scheme:

Find out D?

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  • $$NH_4Cl$$
  • $$CaCl_2$$
  • $$NH_4HCO_3$$
  • $$Ca(OH)_2$$
Which of the following gases has the greatest density at STP conditions?
  • $$Ne$$
  • $$Ar$$
  • $$He$$
  • $$Kr$$
  • $$Xe$$
Statement 1: Oxidation state for fluorine is -1 in all compounds.
Statement 2: Fluorine is the most electronegative element.

  • Statement 1 is correct but statement 2 is not correct.

  • Statement 1 is not correct but statement 2 is correct.

  • Both the statements 1 and 2 are not correct.

  • Both the statements 1 and 2 are correct and statement 2 is not correct explanation of statement 1.

  • Both the statements 1 and 2 are correct and statement 2 is correct explanation of statement 1.

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 $${H}_{2}O$$ 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
Atoms in a $${ P }_{ 4 }$$ molecule of white phosphorus are arranged regularly in which of the following way?
  • At the corners of a cube
  • At the corners of an octahedron
  • At the corners of a tetrahedron
  • At the centre and corners of a tetrahedron
Chlorine was discovered by:
  • Priestley
  • Davy
  • Shceele
  • Cavendish
How many oxides of monomeric nature can nitrogen form?
  • $$1$$
  • $$2$$
  • $$4$$
  • $$5$$
Which of the following does not contain chlorine?
  • Rock salt
  • Sylvine
  • Cryolite
  • Carnallite
Nitrogen does not show pentacovalency because of:
  • absence of s-orbitals
  • absence of d-orbitals
  • its small size
  • none of these
Ammonia gas can be collected by the displacement of:
  • Conc. $$H_2SO_4$$
  • Brine
  • Water
  • Mercury
Which catalyst is used in Haber process for manufacturing of $$NH_3$$?
  • $$Pt$$
  • $$Fe+Mo$$
  • $$CuO$$
  • $$Al_2O_3$$
Which of the following halide of nitrogen is stable in nature?
  • $$NF_ 3$$
  • $$NCl _3$$
  • $$NBr_ 3$$
  • $$NI _3$$
Which of the the following properties of oxygen differs from the rest of members of its family?
  • High value of ionization energy
  • Oxidation state (2,4,6)
  • Polymorphism
  • Formation of hydride
Which of the following chemicals contains chlorine?
  • Fischer salt
  • Epsom salt
  • fremy's salt
  • Spirit of salt
Which of the following gas is heavier than air?
  • $$N_2$$
  • $$O_2$$
  • $$CO_2$$
  • $$H_2$$
Which of the following is a part of the catalyst system used in Haber's process?
  • Copper oxide
  • Iron 
  • Potassium oxide
  • Aluminium oxide
The noble gas mixture is cooled in a coconut bulb at $$173 K$$. The gases that are not adsorbed are:
  • Helium and Neon
  • Helium and Xenon
  • Xenon and Neon
  • none of these
Select the correct statement for brown ring test.
  • Nitrates are converted to $$NO$$
  • $$NO$$ forms complex with $$Fe$$
  • $$Fe^{2+}$$ acts as reducing agent here.
  • Brown colour is due to the complex formation.
In the Ostwald's process for the manufacture of $$HNO_3$$, the catalyst used is:
  • $$Fe$$
  • $$Pt$$
  • $$V_2O_5$$
  • $$Mo$$
An atom has $$2K, 8L$$ and $$5M$$ electrons.
Choose the correct statement(s) regarding it.
A. Trivalent anion of this atom will have $$12$$ protons in its nucleus.
B. Trivalent cation of this atom will have six p-electrons in it.
C. This atom form an amphoteric oxide of formula $$X_{2}O_{3}$$.
D. One of its allotrope is tetra atomic $$(X_{4})$$
  • $$A$$ and $$B$$
  • $$B$$ only
  • $$B$$ and $$C$$
  • $$B$$ and $$D$$
Ammonia is not produced in the reaction of:
  • $$NH_4Cl$$ and $$KOH$$
  • $$AlN$$ with water
  • $$NH_4Cl$$ with $$NaNO_2$$
  • $$NH_4Cl$$ with $$Ca(OH)_2$$
Which of the following pairs are correctly matched? 
Haber process - Manufacture of $$NH_3$$ 
Leblanc process - Manufacture of $$H_2SO_4$$
Birkeland-Eyde process - Manufacture of $$HNO_3$$
Solvay process - Manufacture of $$Na_2CO_3$$ 
  • $$2, 3, 4$$
  • $$1, 2, 3, 4$$
  • $$1, 2$$
  • $$1, 3, 4$$
Nitrogen forms stable $$N_{2}$$ molecule but phosphorus is converted to $$P_{4}$$ from $$P_{2}$$ because:
  • p$$\pi$$-p$$\pi$$ bonding is strong in phosphorus
  • p$$\pi$$-p$$\pi$$ bonding is weak in phosphorus
  • triple bond is present in phosphorus
  • single $$P - P$$ bond is weaker than $$N -N$$ bond
Ammonia is not produced in the reaction of ________.
  • $$NH_4Cl $$ with KOH
  • $$AlN$$ with water
  • $$NH_4Cl$$ with $$NaNO_2$$
  • $$NH_4Cl$$ with $$Ca(OH)_2$$
Each of the following is true for white and red phosphorus except that they:
  • are both soluble in $$CS_{2}$$
  • can be oxidized by heating in air
  • consist of the same kind of atoms
  • can be converted into one another.
White phosphorus $$P_4$$ has the following characteristics.
  • $$6$$ P-P single bonds
  • $$4$$ P-P single bonds
  • $$4$$ lone pair of electrons
  • P-P-P angle of $$60^o$$
$$2$$ moles of $$PCl_{5}$$ were heated in a closed vessel of $$2$$ litre capacity. At equilibrium, $$40\%$$ of $$PCl_{5}$$ is dissociated into $$PCl_{3}$$ and $$Cl_{2}$$. The value of equilibrium constant is:
  • $$0.266$$
  • $$0.53$$
  • $$2.66$$
  • $$5.3$$
In Haber's process $$50.0\ g$$ of $$N_{2}(g)$$ and $$10.0\ g$$ of $$H_{2}(g)$$ are mixed to produced $$NH_{3}(g)$$. What are the number of moles of $$NH_{3}(g)$$ formed?
  • $$3.33$$
  • $$2.36$$
  • $$2.01$$
  • $$5.36$$
Fluorine is the best oxidising agent because it has:
  • highest electron affinity
  • highest reduction potential
  • highest oxidation potential
  • lowest electron affinity.
Which among the following statements is incorrect?
  • $$XeF_{4}$$ and $$SbF_{5}$$ combine to form salt.
  • $$He$$ and $$Ne$$ do not form clathrates.
  • $$He$$ has highest boiling point in its group.
  • $$He$$ diffuses through rubber and polyvinyl chloride.
Potassium permanganate $$\rightarrow$$ potassium manganate + $$A$$ + oxygen. 
What is $$A$$ in the given reaction?
  • Manganese
  • Manganese dioxide
  • Manganese trioxide
  • Manganese tetraoxide
While preparing oxygen from potassium permanganate a plug of cotton must be put in a hard glass test tube.
  • True
  • False
Chlorine has two naturally occuring isotopes $$_{ 17 }^{ 37 }{ Cl }$$ and $$_{ 17 }^{ 35 }{ Cl }$$ and average atomic mass of chlorine is $$35.5$$. The percentage of $$_{ 17 }^{ 37 }{ Cl }$$ is:
  • 25%
  • 75%
  • 40%
  • 60%

Which of the following is the polar molecules ?
  • $$XeF{l_4}$$
  • $$S{F_4}\;$$
  • $$Si{F_4}$$
  • none
Phosphours sulphide $${ P }_{ 4 }{ S }_{ 3 }$$, a well known chemical used in match industry has many $$P-S$$ bonds ?
  • 4
  • 2
  • 6
  • 8
Which of the following interhalogens cannot exist?
  • $$ClF_5$$
  • $$ClI_5$$
  • $$ICl_2^-$$
  • $$IF_4^-$$
Chlorine is prepared in the laboratory by the action of:
  • Zn and HCl
  • CaCO$$_3$$ and HCl
  • Pb$$($$NO$$_3)_2$$ and HCl
  • MnO$$_2$$ and HCl
Select reaction in which at least one compound is formed as product, in which Xe is in +6 oxidation state? 
  • $$XeF_6+CsF \xrightarrow[thermal \, decomposition]{\Delta} product$$
  • $$XeF_6 \overset{Hydrolysis} {\rightarrow} \quad ? \xrightarrow[disproportion]{OH^-} product$$
  • $$Xe+F_2\overset{873\, K, 7 bar}{\rightarrow} \quad ? \quad \overset{SF_6}{\rightarrow}product$$
  • $$Xe_{excess}+F_2 \quad \overset{400^0C,1 bar}{\rightarrow}\xrightarrow[of water]{Excess} product$$
The atomic number of $$N$$ isThe atomic number of 3rd member of nitrogen family will be: 
  • 23
  • 15
  • 33
  • 43
An aqueous solution of a halogen salt of potassium reacts with the same halogen $$X_2$$ to give $$KX_3$$, a brown-colored solution, in which halogen exists as $$X^-_3$$ ion, $$X_2$$ as a Lewis acid, and $$X^-$$ as a Lewis base, halogen base is:
  • Chlorine
  • Bromine
  • Iodine
  • Fluorine
Element which never has positive oxidation state in any of its compounds is?
  • Chlorine
  • Bromine
  • Oxygen
  • Fluorine
Which of the following statements is true?
(i) The order of acidic strength of haloacid is 
HF>HCl>HBr>HI.
(ii) The order of stability of compounds is 
HF<HCI<HBr<HI.
  • (i) is correct and (ii) is incorrect
  • (i) is incorrect and (ii) is incorrect
  • Both are incorrect
  • Both are correct
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