CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 4 - MCQExams.com

Argon was discovered by :
  • Rayleigh
  • Ramsay
  • Both (A) and (B)
  • Frankland and Lockeyer
$$\mathrm{V}\mathrm{A}$$ group elements are known as:
  • halogens
  • normal elements
  • chalcogens
  • pnicogens
Bond angle in $$\mathrm{P}_{4}$$ molecule is
  • $$60^{0}$$
  • $$90^{0}$$
  • $$120^{0}$$
  • $$109^{0}28'$$
Ammonia is dried over :
  • Quick lime
  • Slaked lime
  • Phosphorus pentoxide
  • Con. $$\mathrm{H}_{2}\mathrm{S}\mathrm{O}_{4}$$
Calcium cyanamide on treatment with steam under pressure gives ammonia and :
  • calcium carbonate
  • calcium hydroxide
  • calcium oxide
  • calcium bicarbonate
In Haber's process for the manufacture of ammonia, the catalyst used is :
  • finely divided nickel
  • finely divided molybdenum
  • finely divided iron
  • finely divided platinum
The catalytic promoter used in Haber's process is :
  • Mo
  • Ni
  • Pt
  • $$\mathrm{V}_{2}\mathrm{O}_{5}$$
 Ionic radius (in $$\mathrm{A}^{\mathrm{o}}$$) of $$\mathrm{A}\mathrm{s}^{3+},\mathrm{S}\mathrm{b}^{3+}$$ and $$\mathrm{B}\mathrm{i}^{3+}$$ follow the order :
  • $$\mathrm{S}\mathrm{b}^{3+}>\mathrm{B}\mathrm{i}^{3+}$$
  • $$ \mathrm{S}\mathrm{b}^{3+}>\mathrm{B}\mathrm{i}^{3+}>\mathrm{A}\mathrm{s}^{3+}$$
  • $$ \mathrm{B}\mathrm{i}^{3+}>\mathrm{A}\mathrm{s}^{3+}>\mathrm{S}\mathrm{b}^{3+}$$
  • $$\mathrm{B}\mathrm{i}^{3+}>\mathrm{S}\mathrm{b}^{3+}>\mathrm{A}\mathrm{s}^{3+}$$
Electronegativity of inert gases is :
  • low
  • high
  • zero
  • abnormally high
Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

Non-metal other than carbon, which shows allotropy is:
  • sulphur
  • phosphorus
  • nitrogen
  • both A and B
The molecular formula of phosphorous is:
  • $$P_{1}$$
  • $$P_{4}$$
  • $$P_{2}$$
  • $$P_{5}$$
The colour and state of phosphorus pentoxide is :
  • white crystalline solid
  • white amorphous liquid
  • blue crystalline
  • blue colour liquid
Zero group elements are known as____________.
  • alkali metals
  • alkaline earth metals
  • transition metals
  • inert gases
Most abundant uncombined element present in atmosphere is :
  • Ca
  • Mg
  • Al
  • N
Which is the most thermodynamically stable allotropic form of phosphorus?
  • Red
  • White
  • Black
  • Yellow
Among these ores the highest phosphorus content is in :
  • chlorapatite
  • phosphorite
  • fluorspar
  • all have equal content
The percentage of p-character in the orbitals forming P−PP−P is :
  • 25
  • 33
  • 50
  • 75
Which one of these group off elements is also called the halogen family?
  • Group 16
  • Group 18
  • Group 10
  • Group 17
Essential constituents of plants and animal tissues are :
  • N and P
  • N and As
  • Cu and Mg
  • Ca and Mg
The most abundant element in the atmosphere is :
  • Phosphorus
  • Oxygen
  • Nitrogen
  • Carbon
Phosphorus normally exhibits a covalency of :
  • $$+3$$ and $$+5$$
  • $$+2$$ and $$+3$$
  • $$+1$$ and $$+2$$
  • $$+3$$ and $$+4$$
Helium gas is used in observatory balloon.
  • True
  • False
Which of the following non-metals belongs to the halogen family?
  • Flourine
  • Chlorine
  • Bromine
  • All of the above
Helium is the lightest gas.
  • True
  • False
The word Argon means_____________.
  • Noble
  • Now
  • Strange
  • Lazy
Which of the following is a noble gas?
  • $$He$$
  • $$N_2$$
  • $$H_2$$
  • $$O_2$$
An element X combines with hydrogen to form a compound $$NH_3$$. The element X is placed on the right side of the periodic table. What is true about the element X?
(a) Has $$3$$ valence electrons
(b) Is a metal and is solid
(c) Is a non-metal and is a gas
(d) Has $$5$$ valence electrons
(e) $$NH_3$$ reacts with water to form a basic compound.
  • (a), (b) and (c)
  • (b), (c) and (d)
  • (c), (d) and (e)
  • (e), (a) and (b)
Which element is monoatomic gas at room temperature?
  • $$Ne$$
  • $$F$$
  • $$O_2$$
  • $$N_2$$
Neon gas is used in neon signs.
  • True
  • False
In  the preparation of ammonia gas from ammonium chloride and calcium hydroxide, the reactants are ground thoroughly________
  •  to provide maximum surface area
  •  to provide maximum surface area
  • to increase the number of particle
  • None of these
What is the bond order of N-N bond in $$N_2O$$?
  • 1
  • 1.5
  • 2
  • 2.5
Noble gases do not react because they have __________ electrons in their valence shell.
  • 3
  • 6
  • 1
  • 8
Ammonia can be collected by displacement of
  • Water
  • $$Conc.{ H }_{ 2 }S{ O }_{ 4 }$$
  • Brine
  • Mercury

The catalyst used in laboratory preparation of oxygen is:
  • $$MgO$$
  • $$MnO_2$$
  • $$Pt$$
  • $$Fe$$
Which of the following has seven valence electrons?
  • $$Na^{+}$$
  • $$Al$$
  • $$F$$
  • $$Ti$$
  • $$B$$
Which of the following pairs is obtained on heating ammonium dichromate?
  • $$\displaystyle { N }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$
  • $$\displaystyle { N }_{ 2 }O$$ and $$\displaystyle { H }_{ 2 }O$$
  • $$\displaystyle { NO }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$
  • $$\displaystyle NO$$ and $$\displaystyle { NO }_{ 2 }$$
Ammonia gas is not prepared by:
  • Reduction of sodium nitrite or nitrate by the reaction of zinc dust and sodium hydroxide.
  • Hydrolysis of calcium cyanamide.
  • Heating ammonium chloride with slaked lime
  •  Heating of $$(NH_4)_2Cr_2O_7$$
What is found in silver deposits?
  • Phosphorous
  • Bismuth
  • Copper
  • Antimony
$$N,P,As,Sb,Bi$$ elements belong to:
  • VA Group
  • IV A Group
  • VII A Group
  • VIII A Group
White phosphorous $$({P}_{4})$$ has:
  • four $$P-P$$ single bonds
  • four lone pair of electrons
  • $$P-P-P$$ angle of $${ 60 }^{ o }$$
  • eight $$P-P$$ single bonds
Urea is prepared by the chemical reaction of:
  • acetamide and ethyl alcochol
  • ammonium sulphate and calcium chloride
  • ammonia and Carbon dioxide
  • chlorine and water
Fluorine, chlorine, bromine, and iodine form a family of related elements, known as:
  • light gases
  • halogens
  • purines
  • the aromatic ring
All noble gases are:
  • colourlful
  • colourless and odourless
  • colourless and but have odour
  • none of these
From the options given, which of the following is a noble gas?
  • Gunpowder
  • Iodine
  • Boron
  • Helium
Which of the following is the Metallic element in group-15?
  • As
  • Sb
  • Bi
  • P
Similarity of fluorine and oxygen may not be attributed to?
  • Their atomic and ionic radii are closely similar.
  • The atom of both elements attain an octet of electrons in their valence shell
  • Both of them are highly electronegative elements.
  • Both form stable $$p \pi-p \pi$$ multiple bonds with themselves.
In the third excited state, the number of unpaired electrons in chlorine atom is:
  • 5
  • 7
  • 3
  • 1
If a new noble gas is discovered then, what will be its atomic number?
  • $$87$$
  • $$104$$
  • $$118$$
  • $$132$$
The elements with atomic numbers $$2, 10, 18, 36, 54$$ and $$86$$ are collectively known as:
  • alkaline earth metals
  • inert gases
  • halogens
  • rare earths
Which of the following electronic configuration corresponds to an inert gas?
  • $$1s^{1}2s^{2}2p^{5}$$
  • $$1s^{2}2s^{2}2p^{6}$$
  • $$1s^{2}2s^{1}$$
  • $$1s^{2}2s^{2}2p^{6}3s^{1}$$
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