MCQs for Chemistry Class 11 with Answers Chapter 11 The P-Block Elements
Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry The P-Block Elements with answers provided here which is an important chapter in Class 11 Chemistry NCERT textbook. These MCQ for Class 11 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 11 Chemistry examination
Chapter 11 The P-Block Elements MCQ with Answers Class 11 Chemistry
MCQ Questions Class 11 Chemistry The P-Block Elements provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.
Question. PH3, the hydride of phosphorus is
Question. When concentrated HNO3 is heated with P2O5 it forms
Question. Mark the oxide which is amphoteric in character.
Question. Graphite is a soft, solid lubricant, extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(a) is an allotropic form of diamond
(b) has molecules of variable molecular masses like polymers
(c) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
(d) is a non-crystalline substance
Question. Carborundum is obtained when silica is heated at high temperature with
(b) carbon monoxide
(c) carbon dioxide
(d) calcium carbonate
Question. Among the following, the number of compounds that can react with PCl5 to give POCl3 is
O2, CO2, SO2, H2O, H2SO4, P4O10.
Question. Boron cannot form which one of the following anions?
Question. Among the following substituted silanes the one which will give rise to cross linked silicon polymer on
Question. Strong reducing behaviour of H3PO2 is due to
(a) Low oxidation state of phosphorus
(b) presence of two — OH groups and one P—H bond
(c) Presence of one — OH group and two P—H bonds
(d) high electron gain enthalpy of phosphorus
Question. Nitrogen shows different oxidation states in the range
(a) 0 to +5
(b) −3 to +5
(c) −5 to +3
(d) −3 to+3
Question. A hydride of nitrogen which is acidic is
Question. When conc. H2SO4 is heated with P2O5, the acid is converted to
(a) sulphur trioxide
(b) sulphur dioxide
(d) a mixture of sulphur dioxide and sulphur trioxide
Question. The pair in which phosphorus atoms have a formal oxidation state of +3 is
(a) pyrophosphorus and hypophosphoric acids
(b) orthophosphorus and hypophophoric acids
(c) pyrophosphorus and pyrophosphoric acids
(d) orthophosphorus and pyrophosphorus acids
Question. The compound that does not produce nitrogen gas by the thermal decomposition is
(b) (NH4)2 Cr2O7
(d) (NH4)2 SO4
Question. Extra pure N2 can be obtained by heating
(a) NH3 with CuO
(c) (NH4)2 Cr2O7
Question. The number of s bonds in P4O10 is
Question. White phosphorus on reaction with NaOH gives PH3 as one of the products. This is a
(a) dimerisation reaction
(b) disproportionation reaction
(c) condensation reaction
(d) precipitation reaction
Question. The molecule having smallest bond angle is
Question. Name of the structure of silicates in which three oxygen atoms of [SiO4]4− are shared is
(b) sheet silicate
(c) linear chain silicate
(d) three dimensional silicate
Question. Which among the following is the most reactive?
Question. The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJmol−1 ) of C—C, Si—Si and Ge—Ge bonds are respectively
(a) 348, 297, 260
(b) 297, 348, 260
(c) 348, 260, 297
(d) 260, 297, 348
Question. The number of S—S bonds in sulphur trioxide trimer (S3O9 ) is
Question. Which of the following are peroxoacids of sulphur?
(a) H2SO5 and H2S2O8
(b) H2SO5 and H2S2O7
(c) H2SO7 and H2S2O8
(d) H2SO6 and H2S2O7
Question. Among the following oxoacids, the correct decreasing order of acid strength is
(a) HOCI > HCIO2 > HCIO3 > HCIO4
(b) HCIO4 > HOCI > HCIO2 > HCIO3
(c) HCIO4 > HCIO3 > HCIO2 > HOCI
(d) HCIO2 > HCIO4 > HCIO3 >HOCI
Question. Which of the following statements is incorrect?
(a) The stability of hydrides increases from NH3 to BiH3 in group 15 of the periodic table
(b) Nitrogen cannot form dp-pp bond
(c) Single N—N bond is weaker than the single P—P bond
(d) N2O4 has two resonance structures
Question. The correct order of the thermal stability of hydrogen halides (H—X ) is
(a) HI > HCl > HF > HBr
(b) HCl < HF > HBr < HI
(c) HF > HCl > HBr > Hl
(d) Hl > HBr > HCl > HF
Question. In curing cement plasters water is sprinkled from time to time. This helps in
(a) keeping it cool
(b) developing interlocking needle like crystals of hydrated silicates
(c) hydrating sand and gravel mixed with cement
(d) converting sand into silicic acid
Question. Which one of the following compounds has the smallest bond angle in its molecule?
Question. The solubility order of alkali metal fluoride in water is
(a) LiF < RbF < KF < NaF
(b) RbF < KF < NaF < LiF
(c) LiF > NaF > KF > RbF
(d) LiF < NaF < KF < RbF
Question. Which of the following is the wrong statement?
(a) O3 molecule is linear
(b) Ozone is violet black in solid state
(c) Ozone is diamagnetic gas
(d) ONCl and ONO− are not isoelectronic
Question. Which of the following statements regarding sulphur is incorrect?
(a) S2 molecule is paramagnetic
(b) The vapour at 200°C consists mostly of S8 rings
(c) At 600°C, the gas mainly consists of S2 molecules
(d) The oxidation state of sulphur is never less than +4 in its compounds
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 N2
(d) BF3 is symmetrical molecule whereas NF3 is unsymmetrical
Question. The structure of XeO3 is
Question. An inorganic compound containing (3c-2e−) and (2c-2e−) bonds when reacts with NH3, at a certain temperature, gives a compound ‘X’ which is isostructural with benzene and when reacts at high temperature forms a substance ‘ Y’. The substance ‘Y’ is
(c) inorganic graphite
(d) B2H6 . 2NH3
Question. Which one has the highest boiling point?
Question. Argon is used in arc welding because of its
(a) low reactivity with metal
(b) ability to lower the melting point of metal
(d) high calorific value
Question. In which of the following arrangements, the sequence is not strictly according to the property written against it?
(a) CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
(b) HF < HCl < HBr < HI : increasing acid strength
(c) NH3 < PH3 < AsH3 < SbH3 : increasing basic strength
(d) B < C < O < N : increasing first ionisation enthalpy
Question. The correct order of pseudohalide, polyhalide and interhalogen are
(a) BrI2− ,OCN− , IF5
(b) IF5 , BrI2− ,OCN−
(c) OCN− , IF5 , BrI2−
(d) OCN− , BrI2− , IF5
Question. XeF4 and XeF6 are expected to be
(d) strongly basic
Question. Which of the following statements is true?
(a) H3PO3 is a stronger acid than H2SO3
(b) In aqueous medium, HF is a stronger acid than HCl
(c) HClO4 is weaker acid than HClO3
(d) HNO3 is a stronger acid than HNO2
Question. Which one of the following reaction of xenon compounds is not feasible?
(a) XeO3 + 6HF → XeF6 + 3H2O
(b) 3XeF4 + 6H2O → 2Xe + XeO3 + 12HF + 1.5O2
(c) 2XeF2 + 2H2O → 2Xe + 4HF + O2
(d) XeF6 + RbF → Rb[XeF7]
Question. Which of the following acids possesses oxidising, reducing and complex forming properties?
Question. Identify the incorrect statement among the following.
(a) Ozone reacts with SO2 to give SO3
(b) Silicon reacts with NaOH (aq) in the presence of air tobgive Na2 SiO3 and H2O
(c) Cl2 reacts with excess of NH3 to give N2 and NH4Cl
(d) Br2 reacts with hot and strong NaOH solution to givebNaBr, NaBrO4 and H2O
Question. Among the following, the correct statement is :
(a) Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies spherical ‘s’ orbital and is less directional
(b) Between NH3 and PH3, PH3 is a better electron donor because the lone pair of electrons occupies sp3 orbital and is more directional
(c) Between NH3 and PH3, NH3 is a better electron donor because the lone pair of electrons occupies sp3 orbital and is more directional
(d) Between NH3 and PH3, PH3 is a better electron donor because the lone pair of electrons occupies spherical ‘s’ orbital and is less directional
Question. The formation of O+2 [PtF6 ] is the basis for the formation of xenon fluorides. This is because
(a)O2 and Xe have comparable sizes
(b) both O2 and Xe are gases
(c) O2 and Xe have comparable I.E.
(d) Both (a) and (c)
Question. Consider the following statements.
I. NCl5 does not exist while PCl5 does
II. Both O2+ and NO are paramagnetic
III.Three C — O bonds are not equal in carbonate ion.
IV. Lead prefers to form tetravalent compound.
Which of the above statements are incorrect?
(a) I and III
(b) I, III and IV
(c) II and III
(d) III and IV
Question. The hydrides of the first elements in groups 15-17 namely NH3, H2O and HF respectively shows abnormally high values for melting and boiling points. This is due to
(a) small size of N, O and F
(b) the ability to form extensive intermolecular H-bonding
(c) the ability to form extensive intramolecular H-bonding
(d) effective forces of interaction
Question. An inorganic compound ‘X’, made of two most occurring elements in the earth’s crust and used in building construction, when reacts with carbon forms a diatomic molecule, which is poisonous in nature. Compound ‘X’may be
Question. Which one of the following reactions does not occur ?
(a) F2 + Cl− → 2F− + Cl2
(b) Cl2 + 2F− → 2Cl− + F2
(c) Br2 + 2I− → 2B r− + I2
(d) Cl2 + 2Br− → 2Cl− +Br2
Question. Boric acid is called acid because its molecule
(a) contains replaceable H+ ion
(b) gives up a proton
(c) acceptsOH− from water releasing proton
(d) combines with proton from water molecule
Question. Heating of an aqueous solution of aluminium chloride to dryness will give
Question. B(OH)3 + NaOH ⇌ NaBO2 + Na[B(OH)4 )] + H2O How can this reaction is made to proceed in forward direction?
(a) Addition of cis 1, 2-diol
(b) Addition of borax
(c) Addition of trans 1, 2-diol
(d) Addition of Na2HPO4
We hope the above multiple choice questions for Class 11 Chemistry for Chapter 13 The P-Block Elements provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. The P-Block Elements is an important chapter in Class 11 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for the benefits of class 11 students. Please go through these and let us know if you have any feedback in the comments section.