MCQ Chapter 7 The p – Block Elements Class 12 Chemistry

Please refer to The p – Block Elements MCQ Questions Class 12 Chemistry below. These MCQ questions for Class 12 Chemistry with answers have been designed as per the latest NCERT, CBSE books and syllabus issued for the current academic year. These objective questions for The p – Block Elements will help you to prepare for the exams and get more marks.

The p – Block Elements MCQ Questions Class 12 Chemistry

Please see solved MCQ Questions for The p – Block Elements in Class 12 Chemistry. All questions and answers have been prepared by expert faculty of standard 12 based on latest examination guidelines.

Question. Which element is used in the preparation of pesticides ?
(a) Arsenic
(b) Bismuth 
(c) Antimony
(d) Nitrogez

Question. Which of the following phosphorus is the most reactive?
(a) Red phosphorus
(b) White phosphorus
(c) Scarlet phosphorus
(d) Violet phosphorus

Question. If NO₂ (N₂O₄ ) is dissolved in NaOH, we get solution of
(a) NaNO₂ 
(b) NaNO₃
(c) mixture of NaNO₂ and NaNO₂ 
(d) NaNO₄

Question. The nitrite ion in represented by
I. [O-N=O]^Θ II. [N=O-O]^Θ
Which of the structures represents possible resonance fon-ns of this ion ? 
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I and I

Question. Which has the smallest size ?
(a) Na⁺
(b) Mg²⁺
(c) AI³⁺
(d) p⁵⁺

Question. The atomicity of phosphorus is X and the PPP bond angle in the molecule is Y. What are X and Y? 
(a) X = 4, Y = 90°
(b) X = 4, Y = 60°
(c) X = 3, Y = 120°
(d) X = 2, Y = 180°

Question. Which of the following is not a peroxy acid? 
(a) Perphosphoric acid
(b) Pernitric acid
(c) Perdisulphuric acid
(d) Perchloric acid

Question. The product formed in the reaction of SOCI₂ with white phosphorus is 
(a) PCI₃
(b) SO₂Cl₂
(c) SCl₂
(d) POCI₃

Question. Solid N₂O₅ is
(a) ionic
(c) coordinate covalent
(b) covalent
(d) metallic

Question. The bond angle in NF₃ (102.3°) is smaller than NH₃ (107.2°). This is because of
(a) large size of F compared of H
(b) large size of N compared of F
(c) opposite polarity of N in the two molecules
(d) small size of H compared to N

Question. Which is the anhydride of nitric acid ?
(a) NO
(b) NO₂
(c) N₂O₃
(d) N₂O₅

Question. An element belongs to group 15 and third period of the periodic table. Its electronic configw-ation will be
(a) ls²2s²2p³
(b) ls²2s²2p⁴
(c) ls²2s²2p⁶3p²3p³
(d) ls²2s²2p⁶3p²3p²

Question. Which one of the following is least covalent in nature?
(a) NF₃
(b) BiF₃ 
(c) PF₃
(d) SbF₃

Question. Ammonia is dried over 
(a) slaked lime
(b) calcium chloride
(c) phosphorus pentoxide
(d) quicklime

Question. The statements that is not con-ect is 
(a) hypophosphorous acid reduces silver nitrate to silver
(b) in solid state PCI₅ exists as [PCI₄]⁺ [PCI₆]^–
(c) pure phosphine is non-inflammable
(d) phosphorus acid on heating disproportionates to give metaphosphoric acid and phosphine

Question. Which of the following properties is not shown by NO?
(a) It is diamagnetic in gaseous state 
(b) It is a neutral oxide
(c) It combines with oxygen to form nitrogen dioxide
(d) Its bond order is 2.5

Question. Extrapure N₂ canbeobtainedbyheating
(a) NH₃ with CuO
(b) NH₄NO₃
(c) (NH₄)₂Cr₂O₇
(d) Ba(N₃)₂

Question. Concentrated mtr1c acid, upon long standing, turns yellow-brown due to the fonnation of 
(a) NO
(b) NO₂
(c) N₂O
(d) N₂O₄

Question. Which of the following oxides, at the same concentration when dissolved in water, results in the most acidic solutions ? 
(a) CO₂
(b) B₂O₃
(c) N₂H₅
(d) Li₂O₂

Question. NO₂ is not obtained on heating 
(a) AgNO₃
(c) Cu(NO₃)₂
(b) KNO₃
(d) Pb(NO₃)₂

Question. The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus containing compound. The reaction type, the oxidation states of phosphorus in phosphine and the other product are respectively 
(a) redox reaction, – 3 and – 5
(b) redox reaction, 3 and + 5
(c) disproportionation reaction, – 3 and + 5
(d) disproportionation reaction, – 3 and + 3

Question. The least stable hydride of 15th group elements is
(a) NH₃
(b) PH₃
(c) AsH₃ 
(d) SbH₃
(e) BiH₃

Question. In which of the following, NH₃ is not used? 
(a) Tollen ‘s reagent
(b) Nessler’s reagent
(c) Group reagent for the analysis of IV group basic radicals
(d) Group reagent for the analysis of m group basic radicals

Question. The reaction of P₄ with aqueous NaOH gives 
(a) P(OH)₃
(b) P₂O₅
(c) P(OH)₅
(d) PH₃

Question. Which one of the following oxides of nitrogen dimerises into a colourless solid/liquid on cooling ? 
(a) N₂O
(b) NO
(c) N₂O₃
(d) NO₂
(e) N₂O₅

Question. Phosphorns pentoxide is widely used as 
(a) bleaching agent
(b) dehydrating agent
(c) oxidising agent
(d) reducing agent

Question. Given are H₃PO₂ , H₃PO₃, H₃PO₄ and H₄P₂O₇ .
Which of the above oxoacids results into two series of salts ? 
(a) H₃PO₂
(b) H₃PO₃
(c) H₃PO₄
(d) H₄P₂O₇

Question. The correct order of acidic nature of oxides is in the order
(a) NO < N₂O < N₂O₃ < NO₂ < N₂O₅
(b) N₂O < NO < N₂O₃ < NO₂ < N₂O₅
(c) N₂O₅ < NO₂ < N₂O₃ < NO < N₂O
(d) N₂O₅ < N₂O₃ < NO₂ < NO < N₂O

Question. Match the Column I (Molecules) with Colunm II (Boiling points) and select the correct answer.

Codes 
A B C D E
(a) 3 2 5 4 1
(b) 5 3 2 4 1
(c) 1 4 5 2 3
(d) 1 2 3 4 5

Question. Among the following, the number of compounds that can react with PCI₅ to give POCl₃ is O₂, CO₂, SO₂ , H₂O ,H₂SO₄, P₄O₁₀ .
(a) 1
(b) 2
(c) 3
(d) 4

Question. The structural formula of hypophosphorous acid is

Question. The molecule BF₃ and NF₃ both are covalent compounds, but BF₃ is non-polar and NF₃ is polar.
The reason is that
(a) boron is a metal and nitrogen is a gas in uncombined state
(b) BF₃ bonds have no dipole moment whereas NF₃ bond have dipole moment
(c) atomic size of boron is smaller than that of nitrogen 
(d) BF₃ is symmetrical molecule whereas NF₃ is unsymmetrical

Question. Soid PCl₅ exists as 
(a) PCl⁺₄
(b) PCI₅
(c) PCl⁺₄ and PCI^–₆
(d) PCI^–₆

Question. The reaction ofP4 with X leads selectively to P₄O₆ . The Xis
(a) dry O₂
(b) a mixture of O₂ and N₂
(c) moist O₂
(d) O₂ in the presence of aqueous NaOH

Question. The catalyst used in the manufacture of H₂SO₄ by contact process is 
(a) V₂O₃
(b) V₂O₅
(c) FeO
(d) Cu

Question. SO₂ doesnotactas
(a) bleaching agent
(b) oxidising agent
(c) reducing agent
(d) dehydrating agent

Question. The element evolving two different gases on reaction with cone. sulphuric acid is 
(a) P
(b) C
(c) Hg
(d) S
(e) Sn

Question. The most abundant element in the earth crust is 
(a) O
(b) Si
(c) H
(d) C

Question. Which of the following oxyacids of phosphorus is a reducing agent and monobasic ? 
(a) H₃PO₂
(b) H₃PO₃
(c) H₃PO₄
(d) H₄P₂O₆

Question. Hydrolysis of NCI₃ gives NH₃ and X. Which of the following is X ? 
(a) HCIO₄
(b) HCIO₃
(c) HOCI
(d) HCIO₂

Question. Thebasicity of H₃PO₄ is 
(a) 2
(b) 3
(c) 4
(d) 5

Question. H₃PO₃ has ………. non-ionisable P- Hbonds.
(a) 3
(b) 1
(c) 2
(d) None of these

Question. Which of the following(s) when heated give nitrogen gas?
(a) (NH₄)₂ Cr₂O₇
(b) Ba(N₃)₂
(c) NH₄NO₃
(d) Both (a) and (b)

Question. Liquor ammonia is 
(a) ammonium hydroxide
(b) liquefied ammonia gas
(c) concentrated solution of NH₃ in water
(d) a solution of NH₃ in alcohol

Question. Liquor ammonia bottles are opened only after cooling. This is because 
(a) it is a mild explosive
(b) it generates high vapour pressure
(c) Both (a) and (b)
(d) it is a lachrymatory

Question. Industrial name of H₂S₂O₇ is 
(a) pyrosulphuric acid
(b) Marshall ‘s acid
(c) oleum
(d) All of these

Question. Bleaching action of SO₂ is due to its 
(a) oxiclising property
(b) acidic property
(c) basic property
(d) reducing property

Question. If an allotropic form changes slowly to a stable form. It is called 
(a) enantiotropy
(b) dynamic allotropy
(c) monotropy
(d) None of these

Question. Which of the element of nitrogen family produce maximum number of oxyacids ? 
(a) N
(b) P
(c) As
(d) Sb

Question. Which of the following pairs is obtained on heating anunonium dichromate ?
(a) N₂ and H₂O
(b) N₂O and H₂O
(c) NO₂ and H₂O
(d) NO and NO₂

Question. As the number of – OH groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength 
(a) increases
(b) decreases
(c) remains nearly same
(d) remains appropriately same

Question. Pb reacts with dilute HNO₃ gives 
(a) NO
(b) NH₄NO₃
(c) N₂O₅
(d) NO₂

Question. Sodium pyrophosphate is represented by which of the following fonnula ? 
(a) Na₂P₂O₄
(b) Na₄P₂O₅
(c) Na₄P₂O₇
(d) Na₂P₂O₅

Question. What are the products obtained when ammonia is reacted with excess chlorine ? 
(a) N₂ and NCI₃
(c) N₂ and NH₄Cl
(b) N₂ and HCl
(d) NCI₃ and HCl

Question. Correct order of decreasing thermal stability is as
(a) NH₃ > PH₃ > AsH₃ > SbH₃ 
(b) PH₃ > NH₃ > AsH₃ > SbH₃
(c) AsH₃ > PH₃ > NH₃ > SbH₃
(d) SbH₃ > AsH₃ > PH₃ > NH₃

Question. Which one of the following pentafluorides cannot be formed? 
(a) PF₅
(b) AsF₅
(c) SbF₅
(d) BiF₅

Question. Which of the following forms vortex ring? 
(a) P₂O₅
(b) PH₃
(c) NH₃
(d) P₄O₁₀

Question. Reaction of HNO₃ with I, S, P and C gives respectively
(a) HIO₃ , H₂SO₄, H₃PO₄ and CO₂
(b) HIO₃ , H₂SO₄ , H₃PO₃ and CO₂
(c) HIO₂ , H₂SO₄, H₃PO₄ and CO
(d) I₂O₅ , SO₂ , P₂O and CO₂

Question. Red P can be obtained by white P by
(a) heating it with a catalyst in an inert atmosphere
(b) distilling it in an inert atmosphere
(c) dissolving it in CS₂ and crystallising
(d) melting it and pouring the liquid into water

Question. The treatment of Cu with dilute HNO₃ gives 
(a) N₂O
(b) NO
(c) NH₄⁺
(d) NO₂

Question. NaNH₂ + N₂O → X + NaOH + NH₃ .What is the X ?
(a) N₃Ni
(c) NaN₃
(b) Na₃N
(d) None of these

Question. The sides of safety matches contains
(a) red phosphorus + sand powder
(b) P₄S₃
(c) Ca₃ (PO)₄ + glass pieces
(d) KClO₃ , KNO₃, sulphur + antimony

Question. Pnicogens are the elements of group 
(a) 15
(b) 13
(c) 8
(d) zero

Question. In the electrothermal process, the compound displaced by silica from calcium phosphate is 
(a) calcium phosphide
(b) phosphine
(c) phosphorus
(d) phosphorus pentoxide

Question. The catalyst used in the manufacture of anunonia is
(a) V₂O₅
(b) Pt 
(c) Fe
(d) Ni(CO)₄

Question. The decreasing values of bond angles from NH₃ (107° )to SbH3 (91° )down the group-15 of the periodic table is due to
(a) increasing bp-bp repulsion
(b) increasing p-orbital character in sp³
(c) decreasing lp-bp repulsion
(d) decreasing electronegativity

Question. What is the product fonned when phosphorus trioxide is dissolved in water ?
(a) HPO₃
(b) H₃PO₄
(c) H₃PO₃
(d) HPO₂

Question. P₄ + 3NaOH + 3H₂O → A + 3NaH₂PO₂ , here A is
(a) NH₃
(b) PH₃
(c) H₃PO₄
(d) H₃PO₃

Question. The following are some statements related to VA group hydrides.
I. Reducing property increases from NH₃ to BiH₃.
II. Tendency to donate lone pair decreases from NH₃ to BiH₃.
III. Thermal stability of hydrides decreases from NH₃ to BiH₃.
IV. Bond angle of hydrides decreases form NH₃ to BiH₃.
The con-ect statements are
(a) I, II, III and IV
(b) I, III and IV
(c) I, II and IV
(d) I and IV

Question. Zinc and cold dil. HNO₃ reacts to produce 
(a) NO
(b) NO₂
(c) NH₄NO₃
(d) ZnNO₃

Question. Hypophosphorus acid, H₃PO₂ is
(a) a monobasic acid
(b) a tribasic acid
(c) a dibasic acid
(d) not acidic at all