CBSE Class 12 Chemistry The P Block Elements Question Bank Set A

Question. Which of the following bonds has the highest energy?
(a) S–S
(b) O–O
(c) Se–Se
(d) Te–Te 
Answer. A

Question. Which of the following does not give oxygen on heating?
(a) K₂Cr₂O₇
(b) (NH₄)₂Cr₂O₇
(c) KClO₃
(d) Zn(ClO₃)₂
Answer. B

Question. Which would quickly absorb oxygen?
(a) Alkaline solution of pyrogallol
(b) Conc. H₂SO₄
(c) Lime water
(d) Alkaline solution of CuSO₄
Answer. A

Question. Oxygen will directly react with each of the following elements except
(a) P
(b) Cl
(c) Na
(d) S 
Answer. B

Question. It is possible to obtain oxygen from air by fractional distillation because
(a) oxygen is in a different group of the periodic table from nitrogen
(b) oxygen is more reactive than nitrogen
(c) oxygen has higher b.pt. than nitrogen
(d) oxygen has a lower density than nitrogen. 
Answer. C

Question. Match the following :
  Oxide               Nature
(A) CO             (i) Basic
(B) BaO           (ii) Neutral
(C) Al₂O₃        (iii) Acidic
(D) Cl₂O₇        (iv) Amphoteric
Which of the following is correct option?
     (A) (B) (C) (D)
(a) (i) (ii) (iii) (iv)
(b) (ii) (i) (iv) (iii)
(c) (iii) (iv) (i) (ii)
(d) (iv) (iii) (ii) (i)
Answer. B

Question. The angular shape of ozone molecule (O₃) consists of
(a) 1s and 1p bond
(b) 2s and 1p bond
(c) 1s and 2p bonds
(d) 2s and 2p bonds. 
Answer. B

Question. The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are
(a) O₃, CH₄
(b) O₂, O₃
(c) SO₂, CH₄
(d) N₂O, O₃
Answer. B

Question. Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
(a) Is soluble in water.
(b) Is used as a food preservative.
(c) Forms ‘acid-rain’.
(d) Is a reducing agent.
Answer. B 

Question. Which of the following oxoacid of sulphur has — O — O — linkage
(a) H₂SO₃, sulphurous acid
(b) H₂SO₄, sulphuric acid
(c) H₂S₂O₈, peroxodisulphuric acid
(d) H₂S₂O₇, pyrosulphuric acid 
Answer. C 

Question. Identify the correct formula of oleum from the following :
(a) H₂S₂O₇
(b) H₂SO₃
(c) H₂SO₄
(d) H₂S₂O₈
Answer. A 

Question. In which pair of ions both the species contain S — S bond?
(a) S₄O₆^2–, S₂O₃^2–
(b) S₂O₇^2–, S₂O₈^2–
(c) S₄O₆^2–, S₂O₇^2–
(d) S₂O₇^2–, S₂O₃^2–
Answer. A 

Question. Oleum is
(a) castor oil
(b) oil of vitriol
(c) fuming H₂SO₄
(d) none of these.
Answer. C 

Question. Match List I (substances) with List II (processes) employed in the manufacture of the substances and select the correct option.
       List I                        List II
(Substances)               (Processes)
(A) Sulphuric acid        (i) Haber’s process
(B) Steel                      (ii) Bessemer’s
process
(C) Sodium                 (iii) Leblanc process
hydroxide
(D) Ammonia              (iv) Contact process
(a) A - (i), B - (iv), C - (ii), D - (iii)
(b) A - (i), B - (ii), C - (iii), D - (iv)
(c) A - (iv), B - (iii), C - (ii), D - (i)
(d) A - (iv), B - (ii), C - (iii), D - (i) 
Answer. D 

Question. Which of the following statements is not true for halogens?
(a) All form monobasic oxyacids.
(b) All are oxidizing agents.
(c) All but fluorine show positive oxidation states.
(d) Chlorine has the highest electron-gain enthalpy. 
Answer. C 

Question. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
(a) Br₂ > I₂ > F₂ > Cl₂
(b) F₂ > Cl₂ > Br₂ > I₂
(c) I₂ > Br₂ > Cl₂ > F₂
(d) Cl₂ > Br₂ > F₂ > I₂
Answer. D

Question. The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl.What explains the higher boiling point of hydrogen fluoride?
(a) There is strong hydrogen bonding between HF molecules.
(b) The bond energy of HF molecules is greater than in other hydrogen halides.
(c) The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
(d) The electronegativity of fluorine is much higher than for other elements in the group. 
Answer. A 

Question. Among the following which is the strongest oxidising agent?
(a) Br₂
(b) I₂
(c) Cl₂
(d) F₂
Answer. D

Question. Which one of the following arrangements does not give the correct picture of the trends indicated against it?
(a) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
(b) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity
(c) F₂ > Cl₂ > Br₂ > I₂ : Oxidizing power
(d) F₂ > Cl₂ > Br₂ > I₂ : Electron gain enthalpy
Answer. A,D

Question. Which one of the following orders is not in accordance with the property stated against it?
(a) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
(b) F₂ > Cl₂ > Br₂ > I₂ : Oxidising power
(c) HI > HBr > HCl > HF : Acidic property in water
(d) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity 
Answer. A 

Question. Which statement is wrong?
(a) Bond energy of F₂ > Cl₂
(b) Electronegativity of F > Cl
(c) F is more oxidising than Cl
(d) Electron affinity of Cl > F 
Answer. A

Question. Which of the following has the greatest electron affinity?
(a) I
(b) Br
(c) F
(d) Cl
Answer. D

Question. Which of the following displaces Br₂ from an aqueous solution containing bromide ions?
(a) I₂
(b) I₃^–
(c) Cl₂
(d) Cl^– 
Answer. C

Question. Which of the following species has four lone pairs of electrons?
(a) I
(b) O
(c) Cl–
(d) He
Answer. C 

Question. Match the following :
(A) Pure nitrogen          (i) Chlorine
(B) Haber process        (ii) Sulphuric acid
(C) Contact process      (iii) Ammonia
(D) Deacon’s process    (iv) Sodium azide or
                                           Barium azide
Which of the following is the correct option ?
(A) (B) (C) (D)
(a) (iv) (iii) (ii) (i)
(b) (i) (ii) (iii) (iv)
(c) (ii) (iv) (i) (iii)
(d) (iii) (iv) (ii) (i) 
Answer. A

Question. When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
(a) zero to +1 and zero to –5
(b) zero to –1 and zero to +5
(c) zero to –1 and zero to +3
(d) zero to +1 and zero to –3
Answer. B

Question. Which of the following is used in the preparation of chlorine?
(a) Both MnO₂ and KMnO₄
(b) Only KMnO₄
(c) Only MnO₂
(d) Either MnO₂ or KMnO₄
Answer. A

Question. Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?
(a) Cl
(b) Br
(c) Al
(d) Na 
Answer. A

Question. When chlorine is passed over dry slaked lime at room temperature, the main reaction product is
(a) Ca(ClO₂)₂
(b) CaCl₂
(c) CaOCl₂
(d) Ca(OCl)₂ 
Answer. C

Question. In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with
(a) carbon dioxide
(b) chlorine
(c) iodine
(d) sulphur dioxide.
Answer. B

Question. The bleaching action of chlorine is due to
(a) reduction
(b) hydrogenation
(c) chlorination
(d) oxidation. 
Answer. D

Question. Bleaching powder reacts with a few drops of conc. HCl to give
(a) chlorine
(b) hypochlorous acid
(c) calcium oxide
(d) oxygen. 
Answer. A

Question. Among the following, the correct order of acidity is
(a) HClO₂ < HClO < HClO₃ < HClO₄
(b) HClO₄ < HClO2 < HClO < HClO₃
(c) HClO₃ < HClO₄ < HClO₂ < HClO
(d) HClO < HClO₂ < HClO₃ < HClO₄
Answer. D

Question. Which of the statements given below is incorrect?
(a) O₃ molecule is bent.
(b) ONF is isoelectronic with O₂N^–.
(c) OF₂ is an oxide of fluorine.
(d) Cl₂O₇ is an anhydride of perchloric acid.
Answer. C

Question. The correct order of increasing bond angles in the following species is
(a) Cl₂O < ClO₂ < ClO₂^–
(b) ClO₂ < Cl₂O < ClO₂^–
(c) Cl₂O < ClO₂^– < ClO₂
(d) ClO₂^– < Cl₂O < ClO₂ 
Answer. D

Question. Which one of the following oxides is expected to exhibit paramagnetic behaviour?
(a) CO₂
(b) SiO₂
(c) SO₂
(d) ClO₂
Answer. D

Question. Match the interhalogen compounds of column-I with the geometry in column-II and assign the correct code.
Column I              Column II
(A) XX′               (i) T-shape
(B) XX′3             (ii) Pentagonal bipyramidal
(C) XX′5             (iii) Linear
(D) XX′7             (iv) Square pyramidal
                          (v) Tetrahedral
Code :
      A    B    C   D
(a) (iii) (i) (iv) (ii)
(b) (v) (iv) (iii) (ii)
(c) (iv) (iii) (ii) (i)
(d) (iii) (iv) (i) (ii)
Answer. A

Question. Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code.
Column-I          Column-II
(A) XeF₄        (i) pyramidal
(B) XeF₆        (ii) square planar
(C) XeOF₄     (iii) distorted octahedral
(D) XeO₃       (iv) square pyramidal
    (A) (B) (C) (D)
(a) (iii) (iv) (i) (ii)
(b) (i) (ii) (iii) (iv)
(c) (ii) (iii) (iv) (i)
(d) (ii) (iii) (i) (iv)
Answer. C

Question. Identify the incorrect statement, regarding the molecule XeO₄.
(a) XeO₄ molecule is square planar.
(b) There are four pp - dp bonds.
(c) There are four sp³ - p, s bonds.
(d) XeO₄ molecule is tetrahedral.
Answer. A

Question. Which compound has planar structure?
(a) XeF₄
(b) XeOF₂
(c) XeO₂F₂
(d) XeO₄
Answer. A

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