CBSE Class 12 Chemistry P Block Elements Type Mll Worksheet

CBSE Class 12 Chemistry p block elements type MLL. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

MCQ Questions for NCERT CBSE Class 12 Chemistry P Block Elements

Question. Nitrogen forms N₂ but Phosphorous is converted into P₄ from Phosphorous, the reason is
(a) Triple bond is present between Phosphorous atom
(b) Pπ-Pπ bonding is strong
(c) Pπ-Pπ Bonding is weak
(d) Multiple bonds are formed easily

Answer: C

Question. Partial hydrolysis of XeF4 gives
(a) XeO₃
(b) XeOF₂
(c) XeOF₄
(d) XeF₂

Answer: B

Question. What is the correct order of reactivity of group 16 elements?
(a) O > Se > S > Tè > Po
(b) S > O > Tè > Po > Se
(c) S > O > Se > Tè > Po
(d) O > S > Se > Tè > Po

Answer: D

Question. Matching type questions – Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options (a), (b), (c) and (d) given at the end of each question     

(a) A-r, B-s, C-q, D-p
(b) A-r, B-q, C-p, D-s
(c) A-p, B-s, C-q, D-r
(d) A-s, B-p, C-r, D-q

Answer: A

Question. In which of the following sulphur is present in +5 oxidation state?
(a) Di thionic acid
(b) Sulphurous acid
(c) Sulphuric acid
(d) Disulphuric acid

Answer: A

Question. Which of the following statements regarding group 16 elements is not true?
(a) The electronic configuration of Oxygen is [He]2s₂₂p⁴
(b) The electronic configuration of Sulphur is [Ne]3s₂₃p⁴
(c) The atomic radii of the elements of group 16 are larger than those of the corresponding elements of group 15.
(d) The electronic configuration of Tellurium is [Kr]4d₁₀5s₂₅p⁴

Answer: C

Question. H₂S is more acidic than H₂O because
(a) oxygen is more electronegative than sulphur.
(b) atomic number of Sulphur is higher than oxygen.
(c) H — S bond dissociation energy is less as compared to H — O bond.
(d) H — O bond dissociation energy is less also compared to H — S bond

Answer: B

Question. Interhalogen compounds are more reactive than individual halogens because
(a) They are prepared by direct combination of halogens
(b) X-X" bond is weaker than X-X and X”-X” bond
(c) They are thermally more stable than Halogens
(d) There is large difference in their electronegativity

Answer: D

Question. The set with correct order of acidity is
(a) HClO < HClO₂ < HClO₃ < HClO₄
(b) HClO₄ < HClO₃ < HClO₂ < HClO
(c) HClO < HClO₄ < HClO₃ < HClO₂
(d) HClO₄ < HClO₂ < HClO₃ < HClO

Answer: A

Question. Fluorine differs from rest of the halogens in some of its properties. This is due to
(a) its smaller size and high electronegativity.
(b) lack of d-orbitals.
(c) low bond dissociation energy
(d) All of the these

Answer: B

Question. A gas (X) is obtained when Copper reacts with dilute nitric acid. The gas thus formed reacts with oxygen to give brown fumes of (Y). (Y) when dissolved in water gives an important acid (Z) and the gas (X).X, Y and Z respectively are
(a) Nitrogen monoxide, Nitrogen dioxide, Nitric acid.
(b) Nitrogen dioxide, Nitrogen monoxide, Nitric acid.
(c) Nitrous oxide, Nitrogen monoxide, Nitrous acid.
(d) Nitrogen monoxide, Nitrous oxide, Nitric acid.

Answer: A

Question. What happens when white phosphorous is heated at 473 Kelvin under high pressure?
(a) α-Black phosphorous is formed
(b) β-Black phosphorous is formed
(c) Red Phosphorous is formed
(d) No change is observed

Answer: B

Question. If Chlorine is passed through a solution of Hydrogen sulphide in water, the solution turns turbid due to the formation of
(a) Free chlorine
(b) Free sulphur
(c) Nascent Oxygen
(d) Nascent Hydrogen

Answer: B

Question. In BrF₃ (bromine trifluoride) molecule the lone pairs occupy equatorial positions to minimize -
(a) lone pair –bond pair repulsions only
(b) bond pair-bond pair repulsions only
(c) lone pair-lone pair and lone pair-bond pair repulsions
(d) lone pair-lone pair repulsions only

Answer: C

Assertion Reason Based Question :

(a) If both assertion and reason are correct and reason is the correct explanation of the assertion
(b) If both assertion and reason are correct but reason is not the correct explanation of the assertion.
(c) If assertion is correct but reason is the wrong statement.
(d) If both the assertion and reason are incorrect. 

Question. Assertion: Dinitrogen is less reactive than Phosphorous.
Reason: Nitrogen has more electron gain enthalpy than phosphorous.

Answer: C

Question. Assertion: HI cannot be prepared by the reaction of KI with concentrated sulphuric acid.
Reason: HI has lowest H-X bond strength among halogen acids.

Answer: B

Question. Chile saltpetre is the common name of
(a) AgNO₃
(b) NaNO₃
(c) NaSO₄
(d) AgCl

Answer: b

Question. The first noble gas compound obtained was
(a) Xe⁺ PtF₆⁻
(b) XeF₄
(c) XeF₂
(d) XeOF₄

Answer: a

Question. The common oxidation states of group 15 elements are
(a) + 3 and + 5
(b) − 3 and − 5
(c) − 5 and + 5
(d) − 3, + 3 and + 5

Answer: d

Question. Peroxoacids of sulphur are
(a) H₂S₂O₈  and  H₂SO₅
(b) H₂S₂O₈ and H₂S₂O₇
(c) H₂S₂O₇ and H₂S₂O₆
(d) H₂ SO₅ and ₂S₂O₇

Answer: a

Question. Nitrogen lacks d-orbital in its valence shell and hence, it cannot
(a) exhibit orbital hybridisation
(b) exhibit the oxidation state of + 5
(c) forms oxides with oxidation state greater than +3
(d) have covalency greater than three

Answer: b

Question. Among XeO₃ , XeO₄ and XeF₆ , the molecules having same number of lone pairs on Xe are
(a) XeO₃ and XeO₄
(b) XeO₃ and XeF₆
(c) XeO₄ and XeF₆
(d) XeO₃ , XeO₄ F and XeF₆

Answer: d

Question. Which of the following are the applications of dinitrogen gas?
(a) Preservation of biological materials and food items
(b) Production of inert atmosphere in copper and steel industry
(c) In the preparation of explosives
(d) Etching of metals

Answer: a

Question. On heating HNO₃ with P₄O₁₀ ,   the oxide of nitrogen produced is
(a) NO₂
(b) N₂O₅
(c) N₂O₄
(d) N₂O₃

Answer: b

Question. Red phosphorus is less reactive, less volatile and less soluble in non-polar solvent than white/yellow phosphorus because
(a) it has high molecular energy
(b) it has low molecular energy
(c) it forms condensation products
(d) it possesses highly polymerised structures

Answer: d

Question. Which of the following hydrides has the lowest boiling point?
(a) PH₃
(b) AsH₃
(c) SbH₃
(d) NH₃

Answer: a

Question. PH₃ produces smoky rings when it comes in contact with air because
(a) PH₃ reacts with water vapours
(b) PH₃ reacts with N₂
(c) PH₃ burns in air
(d) PH₃ contains impurities of P₄H₂ 

Answer: d

Question. The compound that cannot act both as oxidising and reducing agent is
(a) H₂SO₃
(b) H₃PO₄
(c) HNO₂
(d) H₂O₂

Answer: b

Question. Sulphur exhibits valencies of 2, 4 and 6, whereas oxygen has a valency of 2 due to
(a) being less electronegative than S
(b) presence of d-orbitals in S
(c) S is bigger atom
(d) S has higher ionisation potential

Answer: b

Question. All the hydrides (of group 16 elements) except one possess reducing property. Identity the hydride
(a) H₂Se 
(b) H₂O
(c) H₂S
(d) H₂Te

Answer:  b

Question. Tetrafluorides of elements of group-16 have hybridisation and structure respectively are
(a) sp3 and trigonal pyramidal
(b) sp3 d and tetrahedral
(c) sp3 d and trigonal bipyramidal
(d) sp3 d and tetrahedral

Answer: c

Question. Water is much less volatile than H₂S  because
(a) H₂O  has a bond angle of nearly 150°
(b) hydrogen is loosely bonded with the sulphur
(c) S-atom is less electronegative than O-atom
(d) S-atom is more electronegative than O-atom

Answer: c

Question. Among the following, the number of compounds that can react with PCl 5 to give POCl 3 is
I. O₂ II. CO₂ III. CH₃COOH IV. H₂O V. C₂H₅OH VI. P₄O₁₀
(a) 1
(b) 2
(c) 3
(d) 4

Answer: d

Question. Correct order of bond dissociation energy is
(a) Br₂ > Cl₂
(b) F₂ > Cl₂ 
(c) I₂ > F₂
(d) F₂ > I₂

Answer: d

Question. Which of the following oxides is amphoteric in nature?
(a) Cl₂O₇
(b) Na₂O 
(c) N₂O 
(d) Al₂O₃

Answer: d

Question. Extra pure N2 can be obtained by thermal decomposition of
(a) NH₃ with CuO
(b) NH₄NO₃
(c) (NH₄)₂ Cr₂ O₇
(d) Ba(N₃₎₂

Answer: d

Question. Angular shape of ozone molecule consists of
(a) 1σ-bond and 1π-bond
(b) 2σ-bond and 2π-bonds
(c) 1σ-bond and 2π-bonds
(d) 2σ-bond and 1π-bond

Answer: d

Question. H₂SO₄ is used in
(a) petroleum refining
(b) manufacture of paints, pigments and dyestuff intermediates
(c) detergent industry
(d) All of the above

Answer: d

Question. The industrial preparation of SO₂ is
(a) S(s) + O₂ (g ) → SO₂ (g )
(b) SO₃²⁻(aq) + 2H⁺(aq) → H₂O(l) + SO₂ (g)
(c) 4FeS₂ (s) 11O₂(g) → 2Fe₂O₃(s) + 8SO₂ (g)
(d) All of the above

Answer: c

Question. The anomalous behaviour of fluorine is due to
(a) its small size
(b) its highest electronegativity
(c) low F—F bond dissociation enthalpy and non-availability of d-orbitals in valence shell
(d) All of the above

Answer: d

Question. HCl gas can be dried by passing through
(a) conc. H₂ SO₄
(b) dil. H₂SO₄
(c) conc. HNO₃
(d) dil. HNO₃

Answer: a

One Mark questions

1. Why is H₃PO₃ diprotic?

2. Nitrogen does not form pentahalide like phosphorous,why?

3. H₂O is a liquid while H₂s is a gas ,why?

4. Arrange NH₃ PH₃ AsH₃ BiH₃ SbH₃ in the increasing order of basic strength.

5. Oxygen is a gas while sulphur is a solid,why?

6. Write the formula of hyponitros acid.

7. Why does Al not react with conc.nitricacid?

8. Can PCl₅ act as an oxidising agent and reducing agent?

9. Why does NO₂ readily dimerise?

10. Why is BiH₃ the strongest reducing agent amongst all the hydrides of nitrogen family?

11. Write the chemical formula of peroxodisulphuric acid.

12. Why does NH₃ act as a Lewis base /complexing agent?

13. What is the basicity of H₃PO₄?

14. Why does R₃P = O exist but R₃N = O does not (R = alkyl group)?

15. Why does the reactivity of nitrogen differ from phosphorus?

16. Why is white phosphorous highly reactive?

17. Why group 16 members are called chalcogens?

18. OF₄ is not known but SF₄ is known .Explain

19. Solid PCl₅ exists as an ionic solid,Why?

20. Bismuth is a strong oxidizing agent in pentavalentstate,why? 

Please click the link below to download full pdf file for CBSE Class 12 Chemistry p block elements type MLL.