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P Block Elements Class 12 mcq. We covered all the P Block Elements Class 12 mcq in this post for free so that you can practice well for the exam.
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mcq on P Block Elements for NEET Students
Assertion: Fluorine has a lower (less negative) electron gain enthalpy compared to chlorine.
Reason: Fluorine is more electronegative than chlorine.
a) Both the assertion and the reason are true, and the reason explains the assertion
b) Both the assertion and the reason are true, but the reason does not explain the assertion
c) The assertion is true, but the reason is false
d) The assertion is false, while the reason is true
Option b – Both the assertion and the reason are true, but the reason does not explain the assertion
In cyclotrimetaphosphoric Acid, the number of P=O and P–O bonds are:
a) 3 and 6
b) 3 and 9
c) 6 and 9
d) 3 and 12
Option b – 3 and 9
Sulphur dioxide cannot be synthesized using:
a) Concentrated sulphuric Acid acting on copper
b) Dilute hydrochloric Acid reacting with sodium sulphite
c) Heating iron(II) sulphide in air
d) Boiling sulphur with lime water
Option d – Boiling sulphur with lime water
Among Ne, Ar, Kr, and Xe — the element with the lowest boiling point is …….., while the one with the highest is ……..
a) Ar ; Xe
b) Ne ; Xe
c) Kr ; Xe
d) Ne ; Kr
Option b – Ne ; Xe
When lead nitrate is heated to about 673 K, the resulting products are:
a) Lead(II) oxide, nitrogen dioxide, and oxygen
b) Lead(IV) oxide, nitrogen dioxide, and oxygen
c) Lead(II) oxide, nitrogen monoxide, and oxygen
d) Lead(II) oxide, nitrous oxide, and oxygen
Option a – Lead(II) oxide, nitrogen dioxide, and oxygen
To oxidize one mole of lead(II) sulphide completely, how many moles of ozone are required (assuming full conversion)?
a) 1
b) 2
c) 3
d) 4
Option d – 4
Identify the correct statement(s):
(I) Group 14 elements have lower first ionization energies than their group 13 counterparts
(II) Group 14 elements exhibit higher melting and boiling points than those in group 13
(III) Group 14 elements have slightly greater electronegativity than group 13 elements
a) Only I
b) Only II
c) I and III
d) II and III
Option d – II and III
Which of the following statements best describes nitrous oxide (N₂O)?
a) It behaves as a basic oxide
b) It is a neutral oxide
c) It appears as a brown-colored gas
d) It is a Solid with a blue color
Option b – It is a neutral oxide
Chlorine reacts with excess fluorine at 573 K to form an interhalogen compound (Z). The geometry of Z is:
a) Bent T-shape
b) Pentagonal bipyramidal
c) Square pyramidal
d) Linear
Option a – Bent T-shape
Choose the correct statement:
a) Hydrogen sulfide is a stronger Acid than hydrogen selenide
b) Hydrogen telluride is more acidic than water
c) Phosphine is more basic than ammonia
d) Antimony hydride is more basic than arsenic hydride
Option b – Hydrogen telluride is more acidic than water
Assertion: H₃PO₂ works as a reducing agent, whereas H₃PO₄ does not.
Reason: H₃PO₂ contains one P–OH group while H₃PO₄ has three P–OH groups.
a) Both the assertion and reason are true, and the reason correctly explains the assertion
b) Both the assertion and reason are true, but the reason is not the correct explanation
c) The assertion is true, but the reason is false
d) The assertion is false, and the reason is true
Option b – Both the assertion and reason are true, but the reason is not the correct explanation
Which of the following is an incorrect fact about C₆₀ fullerene?
a) It consists of twelve six-membered and twenty five-membered carbon rings
b) All carbon atoms undergo sp² hybridization
c) Six-membered rings are connected to either five- or six-membered rings
d) Five-membered rings are linked only to six-membered rings
Option a – It consists of twelve six-membered and twenty five-membered carbon rings
The compound that contains a peroxide linkage is:
a) H₂S₂O₇
b) H₂S₂O₈
c) H₂S₂O₆
d) H₂S₂O₅
Option b – H₂S₂O₈
Statement 1: The two O–O bonds in ozone are equal in length.
Statement 2: The bond length between O atoms in ozone is the same as in O₂.
a) Both statements are correct
b) Both statements are incorrect
c) Statement 1 is correct, but statement 2 is incorrect
d) Statement 1 is incorrect, but statement 2 is correct
Option c – Statement 1 is correct, but statement 2 is incorrect
In magnesium bismuthide, the oxidation state of bismuth is:
a) +2
b) +3
c) –2
d) –3
Option d – –3
Which of the following statements about white phosphorus is accurate?
a) It is non-toxic
b) It exhibits chemiluminescence
c) It does not dissolve in either water or carbon disulfide
d) It is the most thermodynamically stable allotrope of phosphorus
Option b – It exhibits chemiluminescence
The number of P–O–P and P–OH linkages in a pyrophosphoric Acid Molecule are:
a) 1, 2
b) 2, 2
c) 1, 4
d) 1, 8
Option c – 1, 4
Amphoteric oxides are formed by which of the following elements?
a) Magnesium, potassium
b) Zinc, aluminium
c) Calcium, sodium
d) Sulphur, boron
Option b – Zinc, aluminium
In the sequence of reactions: Z + 3LiAlH₄ → X + 3LiF + 3AlF₃
X + 6H₂O → 2H₃BO₃ + 6H₂
Identify compounds X and Z.
a) X = B₂H₆, Z = BF₃
b) X = BF₃, Z = HF
c) X = B₂H₆, Z = HF
d) X = B₂H₆, Z = NaF
Option a – X = B₂H₆, Z = BF₃
When chlorine reacts with cold, dilute sodium hydroxide, the products formed are:
a) NaCl, NaOCl, and water
b) NaCl, NaOCl₃, and water
c) NaOCl and water
d) NaCl, HCl, and water
Option a – NaCl, NaOCl, and water
Among sulphur-containing oxoacids, the one where sulphur has the lowest oxidation number is:
a) Sulphurous Acid
b) Dithionic Acid
c) Sulphuric Acid
d) Dithionous Acid
Option d – Dithionous Acid
In the Solid phase, phosphorus pentachloride forms an ionic lattice. The cation has which shape?
a) Octahedral
b) Trigonal planar
c) Square planar
d) Tetrahedral
Option d – Tetrahedral
Compound A is a nitrogen oxoacid produced in the lab by heating KNO₃ with concentrated H₂SO₄ in a glass apparatus. Identify A.
a) Nitric oxide
b) Nitrous acid
c) Nitric acid
d) Hyponitrous acid
Option c – Nitric acid
Which interhalogen compound has the same central Atom hybridization as sulphur in SF₄?
a) BrF₃
b) IF₇
c) BrF₅
d) IF₅
Option a – BrF₃
Copper reacts with dilute nitric acid to form:
a) NO₂
b) NO
c) N₂O
d) N₂
Option b – NO
Gas A is made using the Deacon process. Which of the following about gas A is incorrect?
a) It dissolves in water
b) It is colorless with a pungent, suffocating smell
c) It’s used in wood pulp bleaching
d) It oxidizes H₂S to elemental sulphur
Option b – It is colorless with a pungent, suffocating smell
Choose the incorrect statement:
a) Tridymite is a crystalline silica form
b) Carbonic acid is a weak monobasic acid
c) Graphite is the most thermodynamically stable form of carbon
d) Diamond is a crystalline allotrope of carbon
Option b – Carbonic acid is a weak monobasic acid
Which compound contains two P–OH groups, two P–H bonds, and two P=O bonds?
a) H₂PO₂
b) H₃PO₃
c) H₄P₂O₅
d) H₄P₂O₆
Option c – H₄P₂O₅
Which of the following hydrogen halides is the least thermally stable?
a) HI
b) HBr
c) HCl
d) HF
Option a – HI
When phosphine reacts with mercuric chloride, the products are:
a) P₄, Hg, and HCl
b) Hg₃P₂ and HCl
c) PCl₃ and Hg₂Cl₂
d) Hg and PH₄Cl
Option b – Hg₃P₂ and HCl
Identify the correct statement about p-block elements:
a) O₂ is diamagnetic, whereas other group 16 elements form paramagnetic diatomic molecules
b) Water is a liquid at room temperature, while hydrides of other group 16 elements are Solids
c) Fluorine forms only one oxoacid, unlike other halogens which form many
d) Hydrogen fluoride is a gas, while other group 17 hydrides are liquids
Option c – Fluorine forms only one oxoacid, unlike other halogens which form many
Assertion: Substituting some Si atoms in a silica Network with Al results in a NET positive charge.
Reason: Aluminium is trivalent, whereas silicon is tetravalent.
a) Both assertion and reason are true, and the reason explains the assertion
b) Both assertion and reason are true, but the reason doesn’t explain the assertion
c) Assertion is true, but the reason is false
d) Assertion is false, but the reason is true
Option d – Assertion is false, but the reason is true
The geometry of XeOF₄ is:
a) Square pyramidal
b) Trigonal bipyramidal
c) Octahedral
d) Square bipyramidal
Option a – Square pyramidal
Which of the following oxides is the least acidic?
a) As₂O₃
b) P₂O₃
c) Sb₂O₃
d) Bi₂O₃
Option d – Bi₂O₃
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