CBSE Class 12 Chemistry The P Block Elements Question Bank Set 01

Official Class 12 Chemistry Worksheets: Unit 7 The p-Block Elements

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Chapter-wise Practice Material: Unit 7 The p-Block Elements

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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) S4O62–, S2O32–
(b) S2O72–, S2O82–
(c) S4O62–, S2O72–
(d) S2O72–, S2O32–
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

 
 
VSA QUESTIONS (1 - MARK QUESTIONS)
 
1. In which one of the two structures,NO2+ and NO2-, the bond angle has a higher value?
 
2. Which one of the following is not oxidized by O3. State the reason.
Kl, FeSO4, K2MnO4, KMnO4
 
3. Account for the following (Each question carries one mark)
 
i. Iodine is more soluble in KI, than H2O.
 
ii. R3P = O exist but R3N = Ocan not exist.
 
iii. N-N, bond is weaker than P-P, on the contrary N2 is very inert.
 
iv. Both Cl and O have the same electronegativity but only O forms H-bonding
 
v. NO is paramagnetic in the gaseous state but dimagnetic in liquid and solid state
 
vi. Among Halogens F2 is the strongest oxidising agent
 
vii. ICl bonds are weaker than Cl2.
 
viii. Hydrogen fluoride is much less volatile than hydrogen chloride
 
ix. Interhalogen compounds are strong oxidizing agents
 
x. PCl5 is ionic in nature in the solid state.
 
xi. Sulphur has greater tendency for catenation than Oxygen
 
xii. Phosphorous is more reactive than nitrogen.
 
xiii. Of the noble gases only xenon forms known chemical compounds
 
xiv. In solution of H2SO4 in water the second dissociation constant Ka2,is less than the first Ka1.
 
xv. Pentahalides of a metal is more covalent than its trihalides.
 
xvi. Fe dissolves in HCl to form FeCl2 ,not FeCl3.
 
xvii. Helium is used in diving equipments
 
4. Give reason for the following.((Each question carries one mark)
i. Nitrogen exhibits +5 oxidation state but does not form penta halides.
ii. Phosphine(PH3) is used in Holme’s signals.
iii. H3PO2 shows reducing behavior.
Group 16 elements show low rate of 1st Ionisation Energy than compared to corresponding periods of Group 15
 
5. Draw the structures of the following (Each question carries one mark)
i. H4P2O5
ii. HClO4
iii. BrF3
iv. H3PO3
v. H2S2O8
vi. HOCl2
 
6. Complete the following chemical equations. (Each question carries one mark)
i. XeF4 +O2F2 →
ii. Cu + HNO3 →
iii. HgCl2 +PH3 →
iv. I2 +HNO3 →
v. P 4 +SO2Cl2 →
vi. Cl2 + F2 →
vii. C + H2SO4 →
viii. Na2SO3 + Cl2 + H2O→
ix. NO3– + Fe2+ + H+
 
SA (I) QUESTIONS (2 - MARK QUESTIONS)
 
7. Compare the structures of SF6 and SF4
 
8. i. Write the composition of bleaching powder.
ii. What happens when NaCl is heated with conc. H2SO4 in the presence of MnO2. Write the chemical equation
 
9. i. Hydrolysis of XeF6 is not regarded as a redox reaction. Why?
ii. Write a chemical equation to represent the oxidising nature of XeF4.
 
10. A colourless and a pungent smelling gas which easily liquifies to a colourless liquid and freezes to a white crystalline solid, gives dense white fumes with ammonia. Identify the gas and write the chemical equation for its laboratory preparation
 
11. Explain the structure of the following using VSEPR theory.
i. XeO3
ii. XeF2
 
12. Write the chemical equations of the following reactions
i. Glucose in heated with conc. H2SO4.
ii. Sodium nitrate is heated with conc. H2SO4.
 
SA (II) QUESTIONS (3 - MARK QUESTIONS)
 
13. Arrange the following in the order of the property mentioned
i. PH3,NH3,SbH3,AsH3 (increasing basic strength)
ii. HCl, HBr ,HF ,HF (increasing acid strength)
iii. HClO4,HClO,HClO2 (increasing oxidizing power)
 
14. i. Name the process of manufacture of H2SO4
ii. Outline the different steps involved
iii. What will you observe when H2SO4 is added to hydrated CuSO4
 
15. i. How does O3 react with lead sulphide? Write chemical equation.
ii. What happens when SO2 is passed in acidified KMnO4 solution?
iii. SO2 behaves with lime water similar to CO2.
 
16. An unknown salt X reacts with hot conc. H2SO4 to produce a brown coloured gas which intensifies on addition on copper turnings. On adding dilute ferrous sulphate solution to an aqueous solution of X and then carefully adding conc. H2SO4 along the sides of the test tube, a brown complex Y is formed at the interface between the solution and H2SO4. Identify X and Y and write the chemical equation involved in the reaction.
 
17. A transluscent while waxy solid (A) on heating in an inert atmosphere is converted to its allotropic form (B), Allotrope (A) on reaction with very dilute aqueous NaOH liberates a highly poisonous gas (C) having a rotten fish smell, with excess of chlorine forms D which hydrolyses to form compound (E). Identify the compounds (A) to (E).

 

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