JEE Advanced (Single Correct Type): The p-Block Elements | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. In diborane molecule
(a) Four bridged hydrogens and two terminal hydrogens are present
(b) Two bridged hydrogens and four terminal hydrogens are present
(c) Three bridged hydrogens and three terminal hydrogens are present
(d) None of the above

Correct Answer is option (b)
Diborane has two bridged hydrogens and four terminal hydrogens.

Q.2. What is created by the reaction of natural gas and steam in the Haber-Bosch process?
(a) Ammonia
(b) Nitrogen
(c) Oxygen
(d) Hydrogen

Correct Answer is option (d)
The steam reformation of methane is the reaction of natural gas and steam. It is a critical stage in the Bosch-Haber (industrial ammonia production process), which creates hydrogen gas, H₂, as one of the two reactants alongside nitrogen in the production of ammonia in the presence of an iron catalyst.

Q.3. Action of caustic soda on aluminium hydroxide gives a compound with formula.
(a) Al₂(OH)₄
(b) Na₂ Al(OH)₄
(c) NaAlO₂
(d) Na₃AlO₃

Correct Answer is option (c)
NaAlO₂ is formed in this reaction

Q.4. What form does nitrogen take in plants?
(a) Ammonia
(b) Amide
(c) Nitrate
(d) Nitrite

Correct Answer is option (c)
Plants mostly absorb nitrogen in the form of nitrate ions, as well as ammonium ions. This is provided to them through fertilizers, such as ammonium phosphate and calcium ammonium nitrate.

Q.5. In a borax bead test, which compound is formed?
(a) Orthoborate
(b) Metaborate
(c) Double oxide
(d) Tetraborate

Correct Answer is option (b)
In a borax bead test, metaborate is formed.

Q.6. What happens to the size of atoms in p-block elements when we move from left to right in the same period?
(a) Size does not change
(b) Size increases then decreases

(c) Size increases
(d) Size decreases

Correct Answer is option (d)
The size of the atoms of the elements decreases from left to right throughout the same time period. The electrons are added to the same shell because the row is the same. On the other side, an increase in atomic number corresponds to an increase in protons or positive charge. The overall effective nuclear charge rises as a result. As a result, the electron cloud is drawn closer to the nucleus of the atom. As a result, the size of the object decreases.

Q.7. Inorganic graphite is _____
(a) B₃N₃H₆
(b) B₃N₃
(c) SiC
(d) Fe(CO)₅

Correct Answer is option (b)
Structure of B₃N₃ is similar to that of graphite i.e, it has a layer structure consisting of hexagon rings.

Q.8. When copper chips are exposed to concentrated nitric acid, which gas is produced?
(a) Nitrogen (III) oxide
(b) Nitrogen (IV) oxide
(c) Nitrogen (I) oxide
(d) Nitrogen (II) oxide

Correct Answer is option (b)
The deadly brown gas, NO₂, nitrogen (IV) oxide, is released when copper chips are treated with strong nitric acid. It’s a pungent-smelling reddish-brown gas.

Q.9. Which of the following forces bind together carbon atoms in diamond?
(a) Ionic
(b) Covalent
(c) Dipolar
(d) van der Waals

Correct Answer is option (b)
Carbon atoms in diamond are linked to each other by covalent bonds.

Q.10. When ammonia is oxidized to form nitric acid, what catalyst is used?
(a) Platinum-Rhodium gauze
(b) Vanadium (V) oxide
(c) Palladium hydride
(d) Sodium amalgam

Correct Answer is option (a)
At a temperature of 500 K and a pressure of 9 bars, ammonia is oxidized to nitrogen (II) oxide in the presence of a Pt/Rh gauze catalyst. After that, the nitrous oxide is transformed to nitrogen dioxide, which is subsequently reacted with water to produce nitric acid. The NO that is produced is recycled.

Q.11. The ion which can be precipitated by both HCl and H₂S is:
(a) Pb²⁺
(b) Fe³⁺
(c) Zn²⁺
(d) Cu²⁺

Correct Answer is option (a)
Pb²⁺ forms a precipitate of PbCl₂ and PbS.

Q.12. Which of the following statements about Hypophosphorous acid is incorrect?
(a) It is also called phosphonic acid
(b) The oxidation state of phosphorus is +1
(c) It is monobasic
(d) It is represented by the formula H₃PO₂

Correct Answer is option (a)
The oxoacid of phosphorus hypophosphorous acid, commonly known as phosphinic acid, has a phosphorus oxidation state of +1. In nature, it is monobasic, meaning it dissociates into one hydrogen ion. H₃PO² is the chemical formula for it.

Q.13. In graphite, the electrons are
(a) localised on every third carbon atom.
(b) present in antibonding orbitals
(c) localised on each carbon atom
(d) spread out between the structure

Correct Answer is option (d)
Electrons are spread (delocalised) between the structures.

Q.14. Which of the following compounds has an oxidation state of +5 phosphorus?
(a) Peroxodiphosphoric acid
(b) Hypophosphorous acid
(c) Orthophosphorous acid
(d) Hypophosphoric acid

Correct Answer is option (a)
Phosphorus in peroxodiphosphoric acid has an oxidation state of +5. Phosphorus has an oxidation state of +1 in hypophosphorous acid, +3 in orthophosphorous acid, and +4 in hypophosphoric acid.

Q.15. Which of the following molecular hydrides acts as a Lewis acid?
(a) NH₃
(b) H₂O
(c) B₂H₆
(d) CH₄

Correct Answer is option (c)
B₂H₆ acts as a Lewis acid since it is electron deficient in nature.

Q.16. Why is nitrogen preferred in the welding and cooling of materials?
(a) It is an inert gas
(b) It is non-toxic
(c) It’s a gas and can easily be handled
(d) It has an extremely low freezing point

Correct Answer is option (a)
Non Toxic gasses such as argon are also available. Nitrogen gas, on the other hand, is still the favoured gas since it prevents any undesirable oxidation or explosions. This prevents metals from corroding in the welding business. Nitrogen is utilized in food packaging because it creates a pressured environment that prevents container collapse.

Q.17. The basic structural unit of silicates is:
(a) SiO₄^2-
(b) SiO^–
(c) SiO₄^4-
(d) SO₃^2-

Correct Answer is option (c)
The basic structural unit of silicates is SiO₄^4-.

Q.18. The term ‘pnictogens’ refers to which group?
(a) Group 15
(b) Group 14
(c) Group 11
(d) Group 13

Correct Answer is option (a)
The ‘pnictogens’ are the elements in group 15 of the periodic table. The word pnicogen means ‘to choke.’ Because all of the elements in this category choke in nature, including nitrogen’s choking property. Group 11 doesn’t have a name, however group 13, is known as the Boron group. The Carbon group is the 14th group.

Q.19. The increasing order of atomic radii of the following group 13 elements are:
(a) Al < Ga < In < Tl
(b) Ga < Al < In < Tl
(c) Al < In < Ga < Tl
(d) Al < Ga < Tl < In

Correct Answer is option (b)
The correct sequence of increasing atomic radii
Ga ( 135 pm) < Al (143 pm) < In (167 pm) < Tl (170 pm)

Q.20. Producer gas is defined as which of the following mixtures?
(a) carbon dioxide and hydrogen
(b) carbon monoxide and hydrogen
(c) carbon monoxide and nitrogen
(d) carbon dioxide and nitrogen

Correct Answer is option (c)
Producer gas is a mixture of carbon monoxide and nitrogen, while water gas is a mixture of carbon monoxide and hydrogen. Carbon mixes with oxygen and nitrogen to make producer gas at 1273 K.