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All questions of p- block Elements for NEET Exam

The correct statements among the given are 
  • a)
    Antimony belongs to 15th group and 5th period
  • b)
    electron gain enthalpy of P > N > S > O
  • c)
    Minimum and maximum oxidation number of phosphorus is -3 and +6
  • d)
    Fluoroapatite, formula is Ca6(PO4)6 CaF2
Correct answer is option 'A'. Can you explain this answer?

Divey Sethi answered
Option A: Group 5A (or VA) of the periodic table are the pnictogens:  the nonmetals nitrogen (N), and phosphorus (P), the metalloids arsenic (As) and antimony (Sb), and the metal bismuth (Bi).
Option B: The electron gain enthalpy of P< N< S< O.
Option C: Minimum and maximum oxidation number of phosphorus are -3 and +5 respectively.
Option D: Fluorapatite is a phosphate mineral with the formula Ca5(PO4)3F .
Hence, option A is correct.
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 The correct no. of lone pairs on the central atom of compounds XeF2, XeF4 & XeF6are respectively-            [AIEEE-2002]
  • a)
    3, 2,1
  • b)
    4, 3, 2
  • c)
    1, 3, 4
  • d)
    1, 2, 3
Correct answer is option 'A'. Can you explain this answer?

Krishna Iyer answered
The correct answer is option A (3,2,1)
XeF2​ has a linear shape. Its hybridization is sp3d which means it should have a trigonal bipyramidal shape. Since it has 3 lone pairs, they occupy the equatorial triangle.
XeF4​ has sp3d2 hybridization. It has a square planar shape and 2 lone pairs of electrons.
XeF6​ has one lone pair of electrons. The 6 out of 8 electrons of Xenon are shared by 6 atoms of fluorine.

  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?

Nikita Singh answered
The second ionization energy refers to the energy required to remove the electron from the corresponding monovalent cation of the respective atom.
It is expected to increase from left to right in the periodic table with the decrease in atomic size.
Since the Oxygen atom gets a stable electronic configuration, 2s22p3 after removing one electron, the O+ shows greater ionization energy than F+ as well as N+. 
Thus, correct order will be: O > F > N > C

 In the third period of the periodic table the element having smallest size is        
  • a)
    Na
  • b)
    CI
  • c)
    Ar
  • d)
    Si
Correct answer is option 'B'. Can you explain this answer?

Aarav Sharma answered
The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon.
In a period from left to right atomic size decreases due to Increase in nuclear charge.
but the noble gases are bigger than the halogens as they have octet and sort of repulsion occurs in the shells.
so the smallest element in a period is the halogen.so chlorine Cl is the smallest.

Maximum number of compounds are known in case of :
  • a)
    Krypton
  • b)
    Helium
  • c)
    Argon
  • d)
    Xenon
Correct answer is option 'D'. Can you explain this answer?

Aaditya Ghoshal answered
Only xenon is well known to form chemical compounds, because xenon is large in size and having higer atomic mass.Due to having larger atomic radius the force of attraction between the outer electron and the protons in the nucleus is weaker.

Which of the outer electronic configuration represent argon?
  • a)
    ns2np4
  • b)
    ns2
  • c)
    ns2np2
  • d)
    ns2np6
Correct answer is option 'D'. Can you explain this answer?

Aadhar Academy answered
The correct answer is option D
Outer electronic configuration represents argon ns2,np6.
Atomic no. of argon is 18. Its electronic configuration will be
 1s2 2s2 2p6 3s2 3p6.
As the outermost shell is full (3s23p6) it is called noble gas.

Which of the following gaseous molecule is monoatomic?
  • a)
    Oxygen
  • b)
    Helium
  • c)
    Nitrogen
  • d)
    Chlorine
Correct answer is option 'B'. Can you explain this answer?

Swara Sharma answered
Explanation:
Monoatomic molecules are the molecules that consist of only one atom of an element. They are rare because most elements tend to bond with other atoms to form molecules. However, some elements are stable in their monoatomic form.

The given options are:
a) Oxygen (O2) - Oxygen molecule is diatomic, which means it consists of two atoms of oxygen.
b) Helium (He) - Helium is a rare example of a monoatomic molecule. It exists as a single atom and does not bond with other atoms.
c) Nitrogen (N2) - Nitrogen molecule is diatomic, which means it consists of two atoms of nitrogen.
d) Chlorine (Cl2) - Chlorine molecule is diatomic, which means it consists of two atoms of chlorine.

Therefore, the correct answer is option 'B', Helium, which is a monoatomic molecule.

A brown ring is formed in the ring test for NO3– ion. It is due to the formation of
  • a)
    [Fe(H2O)5 (NO)]2+
  • b)
     FeSO4.NO2
  • c)
    [Fe(H2O)4(NO)2]2+
  • d)
    FeSO4.HNO3
Correct answer is option 'A'. Can you explain this answer?

Sushil Kumar answered
When freshly prepared solution of FeSO4 is added in a solution containing NO3– ion, it leads to formation of a brown coloured complex. This is known as brown ring test of nitrate.

Which one of the following statements regarding helium is incorrect 
[AIEEE 2004]
  • a)
    It is used to produce and sustain powerful superconducting magnets
  • b)
    It is used as a cryogenic agent for carrying out experiments at low temperatures
  • c)
    It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
  • d)
    It is used in gas-cooled nuclear reactors
Correct answer is option 'C'. Can you explain this answer?

Shreya Gupta answered
Helium is twice as heavy as hydrogen, its lifting power is 92% of that of hydrogen. Helium has the lowest melting and boiling point of any element which makes liquid helium an ideal coolant for many extremely low temperature application such as super conducting magnet and cryogenic research where temperature close to absolute zero are needed.

  • a)
  • b)
  • c)
  • d)
Correct answer is option 'A'. Can you explain this answer?

Priyanka Sharma answered
(i) Nitrogen is a non-metal.
(ii) Phosphorus is a non-metal.
(iii) Arsenic is a metalloid and shows Sublimation.
(iv) Bismuth is metal and shows the Inert pair effect.
Hence, option A is correct.

 The valency of inert gas is:
  • a)
    Zero
  • b)
    1
  • c)
    2
  • d)
    3
Correct answer is option 'A'. Can you explain this answer?

Sushil Kumar answered
The correct answer is Option A. 
Valency of an element is defined as its tendency to accept valence electrons.
Since noble gas has completely filled valence (outer) shells, they have the least reactivity.
Hence noble gases are already stable in its elemental form. So its valency is zero.
 

Which of the following is a polar molecule ? [NEET 2013]
  • a)
    SF4
  • b)
    SiF4
  • c)
    XeF4
  • d)
    BF3
Correct answer is option 'A'. Can you explain this answer?

Rajesh Datta answered
SF4 has 4 bond pairs and 1 lone pair of electrons, sp3d hybridisation leads to irregular shapeand resultant
μ ≠ 0.

The number of hydrogen atoms (s) attached to phosphorus atom in hypophosphorous acid  is – [AIEEE-2005]
  • a)
     Two
  • b)
    Zero
  • c)
     Three
  • d)
     One
Correct answer is option 'A'. Can you explain this answer?

Anjali Iyer answered
Molecular formula of Hypophosphorous Acid is H3PO2. In this, two hydrogen atoms are attached to phosphorus atom with single bond, one -OH group is attached to phosphorus atom with single bond and one oxygen atom is attached to phosphorus atom with double bond.

  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?

Gauri Datta answered
Oxidation of ammonia with CuO produces nitrogen gas and water vapor. This reaction is represented as:

2NH3 + 3CuO → 3Cu + N2 + 3H2O

The gaseous chemical produced in this reaction is nitrogen gas (N2), which is also obtained by reacting excess ammonia with chlorine. This reaction is represented as:

2NH3 + Cl2 → N2 + 2HCl

Explanation:

- Ammonium nitrate: Heating ammonium nitrate results in the decomposition of ammonium nitrate into nitrogen gas, water vapor, and oxygen gas. The reaction is represented as:

NH4NO3 → N2 + 2H2O + O2

- Potassium dichromate: Heating potassium dichromate results in the production of oxygen gas and potassium chromate. The reaction is represented as:

4K2Cr2O7 → 4K2CrO4 + 3O2

- Catalytic oxidation of ammonia: Catalytic oxidation of ammonia involves the use of a catalyst (such as platinum or palladium) to oxidize ammonia to nitrogen gas and water vapor. The reaction is represented as:

4NH3 + 5O2 → 4NO + 6H2O
2NO + O2 → 2NO2
4NO2 + O2 → 2N2O5
N2O5 → N2 + 2.5O2

- Reacting excess ammonia with chlorine: This reaction involves the reaction of excess ammonia with chlorine gas to produce nitrogen gas and hydrochloric acid. The reaction is represented as:

2NH3 + Cl2 → N2 + 2HCl

Therefore, option B, reacting excess ammonia with chlorine, is the correct answer.

 Which one of the following reactions of Xenon compounds is not feasible ?     [AIEEE-2009]
  • a)
     3 XeF4 + 6 H2O → 2 Xe + XeO3 + 12 HF + 1.5 O2
  • b)
    2 XeF2 + 2H2O → 2 Xe + 4 HF + O2
  • c)
    XeF6 + RbF → Rb [XeF7]
  • d)
    XeO3 + 6 HF → XeF6 + 3 H2O
Correct answer is option 'D'. Can you explain this answer?

Geetika Shah answered
XeO3​+6HF⟶XeF6​+3H2​O
This reaction is not feasible because the products again react to give reactants back. All the xenon fluorides easily undergo hydrolysis and give xenon oxides but the opposite is not possible.
Hence D

 The element having highest ionisation potential is:
  • a)
    Oxygen
  • b)
    Helium
  • c)
    Nitrogen
  • d)
    Hydrogen
Correct answer is option 'B'. Can you explain this answer?

Rajeev Saxena answered
Thereby, the amount of energy required to remove an electron from the atom decreases. Ionization potential, thus, decreases down a group. The element with highest ionization potential in the periodic table is Helium (2372.1 kj/mol), while the element with the lowest ionization potential is Caesium (375.7 kj/mol).

In the MOT of F2 molecule, number of electrons occupying antibonding orbitals are
    Correct answer is '8'. Can you explain this answer?

    Nandita Ahuja answered
    Fluorine atom have 2+7 electrons so an F2 molecule contain 18 electrons.

    Hence, 8 electrons occupy the antibonding orbitals.

    The correct statements among the following are
    • a)
      Bond lengths in O2 , are 121 , 134, 149 pm
    • b)
      Ozone is stronger oxidising agent than dioxygen
    • c)
      O2 acts as reducing agent when it reacts with powerful oxidising agents like PtF6
    • d)
      Ozone is much more stable than oxygen
    Correct answer is option 'A,B,C'. Can you explain this answer?

    Srishti Kaur answered
    The correct option is Option A, B and C.
    Bond length is inversely proportional to bond order. O2+ has the highest bond order among these three, so it should have the shortest bond length.
    Ozone is a powerful oxidizing agent as compared to oxygen. This is due to the unstable nature of ozone and the nascent oxygen that is released during the reaction.
    O2 when gas makes others like H2 gas to lose electrons, therefore, O2 gas is an oxidizing agent and H2 when gas loses electrons in redox reaction, therefore H2 gas is a reducing agent.
    Oxygen is more stable than ozone. On heating, ozone readily dissociates and forms oxygen and free radicals of oxygen known as nascent oxygen which take part in reaction, thus ozone is more reactive than oxygen

    Which of the following molecular species has unpaired electron(s) ?
    • a)
      N2
    • b)
      O2
    • c)
      NO+
    • d)
      CN-
    Correct answer is option 'B'. Can you explain this answer?

    Priya Chavan answered
     contains two unpaired electrons and is paramagnetic in nature. On the other hand, ,  and  contains all paired electrons and are diamagnetic in nature. 

    In which of the following arrangements, the sequence is not strictly according to the property written against it ?      [AIEEE-2009]
    • a)
      HF < HCl < HBr < HI : increasing acid strength
    • b)
      NH3 < PH3 < AsH3 < SbH3 : increasing basic strength
    • c)
      B < C < O < N : increasing first ionization enthalpy
    • d)
      CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
    Correct answer is option 'B'. Can you explain this answer?

    Geetika Shah answered
    The correct answer is Option B.
    In group15 hydrides, the basic character decreases on going down the group due to decrease in the availability of the lone pair of electrons because of the increase in size of elements from N to Bi. Thus, correct order of basicity is:
    NH3 > PH3 > AsH3 > SbH3.
     

    Noble gases are inert and do not form compounds like other elements because of their:
    • a)
      Low ionization energy
    • b)
      High electron affinities
    • c)
      Close shell electronic configuration
    • d)
      High density
    Correct answer is option 'C'. Can you explain this answer?

    Aravind Kapoor answered
    Helium has two electrons in its outer shell and the rest have eight electrons. Because of their full outer shells, they are very inert and stable. This means they don't tend to react with other elements to form compounds. They are gases under standard conditions.

    Direction: Read the passage given below and answer the following questions:

    Ozone is an unstable, dark blue diamagnetic gas. It absorbs the UV radiation strongly, thus protecting the people on earth from the harmful UV-radiation from the sun. The use of chlorofluorocarbon (CFC) in aerosol and refrigerator and their subsequent escape into the atmosphere, is blamed for making holes in the ozone layer over the Antarctica. Ozone acts as a strong oxidising agent in acidic and alkaline medium. For this property, ozone is used as a germicide and disinfectant for sterilizing water. It is also used in laboratory for the ozonolysis of organic compounds and in industry for the manufacture of potassium permanganate, artificial silk, etc.

    Q. Ozone gives carbonyl compounds with
    • a)
      alkyl chloride
    • b)
      alkanes
    • c)
      alkenes followed by decomposition with Zn/ H2O
    • d)
      alcohols followed by decomposition with Zn/H2O
    Correct answer is option 'C'. Can you explain this answer?

    Shalini Patel answered

    Chapter doubts & questions for p- block Elements - Inorganic Chemistry for NEET 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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