P-Block Practice Questions Bank for JEE Main

P-Block Practice Questions Bank


p block practice question bank for JEE Main

Here we are providing some questions which are very important for JEE Main 2019 exam. Solve these questions and answer them in the comment box below.

1. Which of the following have the highest Melting point?
(1) B (2) Al (3) Ga (4) In

2. Which of the following is a tetrabasic?
(1) Meta phosphorous
(2) Ortho phosphorous
(3) Hypophosphorous
(4) Pyro phosphorous

3. The atomic radius of B, Al, Ga. In and TI are of the Order -
(1) TI< In< Ga< Al< B
(2) B< Al = Ga < In = TI
(3) B< Al< Ga< In< TI
(4) Al<Ga<B<In<TI

4. Metal protected by a layer of its own oxide is -
(1) Au (2) Al (3) Ag (4) Cu

5. Boron compounds behave as Lewis acids because of their -
(1) Acidic nature
(2) Electron-deficient character
(3) Covalent nature
(4) Ionizing property

6. Due to the absence of d-orbitals which of the following does not form complex –
(1) P (2) As (3) N (4) Bi

7. The final product obtained when boric acid is heated to red heat is
(1) Metabolic acid
(2) Tetra boric acid
(3) Pyroboric acid
(4) Boron oxide

8. Bismuth does not form stable pentahalide because of –
(1) Its smaller in size
(2) due to inert pair effect
(3) Its higher electronegativity
(4) Non-availability of d-orbitals

9. The borax bead test is based upon the formation
(1) Boron oxide
(2) Meta borates
(3) Boric acid
(4) Elemental boron

10. A mixture of the boric acid with ethyl alcohol burns with green edged flame due to the formation of -
(1) Ethyl borax
(2) Methyl borate
(3) Ethyl borate
(4) Methyl borax

11. Boric acid polymerizes due to
(1) It's geometry
(2) Its monobasic nature
(3) Its acidic nature
(4) The presence of hydrogen bonds

12. Identify the statement that is not correct as far as the structure of diborane is concerned
(1) Each boron atom forms four bonds in diborane
(2) All B-H bonds in diborane are similar
(3) There are two bridging hydrogen atoms in diborane
(4) The hydrogen atoms are not in the same plane In diborane

13. In diborane are present -
(1) 4 bridged hydrogen atoms are not in the same are present
(2) 2 bridged hydrogen and four terminal hydrogen present
(3) 3 bridged and three terminal hydrogens are present
(4) 1 bridged hydrogen and 1 terminal hydrogen


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14. Which of the following is the most sable allotropic form of Sulphur is-
(1) Plastic
(2) Monoclinic
(3) Rhombic
(4) Milk of Sulphur

15. In alums, each metal ion is surrounded by
(1) Six water molecules
(2) Eight water molecules
(3) Two water molecules
(4) Four water molecules

16. Fill in the blank
Aluminum metal is corroded in coastal places near to the sea, because of protective oxide film …........
(1) is removed by sea water
(2) Is attacked by salt present in seawater
(3) Reacts with sea water
(4) Reacts with sand particles

17. Which alum is a double salt made up of two salts
(1) Salt of  (WA + WB) + Salt of  (SA + WB)
(2) Salt of (SA + WB) + Salt of  (WA + WB)
(3) Salt of  (WA+WB) +Salt of  (SA+SB)
(4) Salt of  (SA+SB) + Salt of  (SA + WB)

18. Boron carbide is widely used for
(1) Making of acetylene
(2) As the hardest substance after diamond
(3) Making plaster of Paris
(4) making of boric acid

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19. Alum is used for the purification of water because of it
(1) Absorbs the suspended impurities
(2) Reduces the impurities
(3) Oxidizes the impurities
(4) Coagulates the suspended impurities

20. Boron compounds behave as Lewis acids because of their
(1) ionization property
(2) covalent nature
(3) acidic nature
(4) electron deficient nature

21. Which of the following shows maximum catenation property?
(1) Se (2) O (3) Te (4) S

22. The structure of diborane contains -
(1) Four 2c-2e bonds and four 3c-2e bonds
(2) Two 2c-2e bonds and four 3c-2e bonds
(3) Two 2c-2e bonds and two 3c-2e bonds
(4) Four 2c-2e bonds and two 3c-2e bonds

23. Different layers in graphite are held together by
(1) Ionic bonding
(2) Covalent bonding
(3) Metallic bonding
(4) Van Der Waals force

24. Which element-element bond has the highest bond dissociation energy
(1) C-C (2) Sn – Sn
(3) Si – Si  (4) Ge – Ge

25. Trisilylamine has
(1) Planar geometry
(2) Pyramidal geometry
(3) Tetrahedral geometry
(4) None of these

26. In the carbon family, the melting points of the elements decrease on descending the group because the interatomic bonds become
(1) Stronger as the size of the atom increases
(2) Stronger as the size of the atom decreases
(3) Weaker as the size of the atom decreases
(4) Weaker as the size of the atom increases

27. What is the percentage of Argon in Air is
(1) 10 Percentage
(2) 1 Percentage
(3) 0.10 Percentage
(4) Much less than o.1 Percentage

28. Chose the correct reason -
Carbon shows strong catenation while silicon shows little or no catenation because
(1) Silicon is a metalloid and carbon is a non-metal
(2) The C-C bond is stronger than the Si-Si bond
(3) The Si-Si bond is stronger than the C-C bond
(4) Silicon forms ionic compounds whereas carbon forms covalent compounds.

29. Which of the following property is the same in red and yellow phosphorus?
(1) Isobars
(2) Isotopes
(3) Allotropes
(4) Isomers

30. Carbon-60 contains
(1) 24 pentagons and 36 hexagons
(2) 12 pentagons and 20 hexagons
(3) 30 pentagons and 30 hexagons
(4) 20 pentagons and 12 hexagons

31. The least stable hydride is
(1) Methane
(2) Stibine
(3) Silane
(4) Plumbane

32. Fluorine reacts with water to give –
(1 ) Ozone and Hydrogen Fluoride
(2) Oxygen and Hydrogen Fluoride
(3) Oxygen Fluoride and Hydrogen Fluoride
(4) Oxygen, Ozone and Hydrogen Fluoride

33. The correct order of decreasing ionic nature of lead
dihalides is
(1) PbF2 > PbCI2 > PbB2 > Pbl2
(2) Pbl2 < PbBr2 < PbCI2 <PF2
(3) PbF2 <PbCl2 > PbBr2 <Pbl2
(4) PbF2 > PbBr2 > PbCl2 > Pbl2

34. Carbon monoxide acts as a Lewis base because of it
(1) A double bond between C and O atoms
(2) Two lone pairs of electrons on the O atom
(3) A triple bond between C and O atoms
(4) A lone pair of electrons on the C atoms

35. When CO is heated with NaOH under pressure, we
get:
(1) Sodium acetate
(2) Sodium benzoate
(3) Sodium oxalate
(4) Sodium formate

36. Which of the following artificial gem used for cutting glass?
(1) Graphite
(2) CaCN2
(3) SIC
(4) Diamond

37. Synthesis gas is a mixture of
(1) Carbon monoxide and nitrogen
(2) Hydrogen and methane
(3) Stem and carbon monoxide
(4) Hydrogen and carbon monoxide

38. Compounds formed when noble gases get entrapped in the cavities of the crystal lattices of certain organic and inorganic compounds are called
(1) Clathrates
(2) Picrate's
(3) Clathrates
(4) Hydrates

39. Which of the following is not a characteristic property of carbon
(1) Multiple bond forming
(2) Catenation
(3) Highest electronegativity in the group
(4) Availability of d-orbitals for bonding


Answers to these questions will be provided on Monday.



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