p-Block Elements PYQs Set 4 (PDF)

Set 4 of 14 · Questions 91-120 of 400

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions NEET Chemistry · p-Block Elements · Set 4 (Q91-120)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
91. $Dinitrogen and dioxygen. the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because$ (1) $N_{2} is unreactive in the condition of atmosphere.$ (2) $Oxides of nitrogen are unstable.$ (3) $Reaction between them can occur in the presence of a catalyst.$ (4) $The reaction is endothermic and require very high temperature.$ 92. $Which of the following anions is present in the chain structure of silicates?$ (1) $(S i_{2} O_{5}^{2 -})_{n}$ (2) $(S i O_{3}^{2 -})_{n}$ (3) $S i O_{4}^{+}$ (4) $S i_{2} O_{7}^{6 -}$ 93. $The correct order of the thermal stability of hydrogen halides (H - X) is :$ (1) $HI > HBr > HCl > HF$ (2) $HF > HCl > HBr > HI$ (3) $HCl < HF < HBr < HI$ (4) $HI > HCl < HF < HBr$ 94. $Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II: Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below$ (1) $Both Statement I and Statement II are incorrect$ (2) $Statement I is correct but Statement II is incorrect$ (3) $Both statement I and Statement II are correct$ (4) $Statement I is incorrect but Statement II is correct$ 95. $On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is:$ (1) $+3$ (2) $+4$ (3) $+5$ (4) $+2$ 96. $On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed?$ (1) $Nitric oxide$ (2) $Nitrous oxide$ (3) $Lead nitrate$ (4) $Sulphur$ 97. $The noble gas mixture is cooled in a coconut bulb at 173 K . The gases that are not adsorbed are$ (1) $Ne and Xe$ (2) $He and Xe$ (3) $Ar and Kr$ (4) $He and Ne.$ 98. $Iodine reacts with concentrated HNO_{3} to yield Y along with other products. The oxidation state of iodine in Y, is:$ (1) $5$ (2) $7$ (3) $3$ (4) $1$ 99. $Which halogen forms an oxyacid that contains the halogen atom in tripositive oxidation state?$ (1) $Fluorine$ (2) $Chlorine$ (3) $Bromine$ (4) $Iodine$ 100. $Identify the correct statements from the following: I. CO_{2} (g) is used as refrigerant for ice-cream and frozen food. II. The structure of C_{60} contains twelve six carbon rings and twenty five carbon rings. III. ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. IV. CO is colorless and odourless gas.$ (1) $I and III only$ (2) $II and III only$ (3) $III and IV only$ (4) $I, II and III only$ 101. $Match List-I with List-II List I (1) Sodium Carbonate (2) Titanium (3) Chlorine (4) Sodium hydroxide List II (i) Deacon (ii) Caster Kellner (iii) Van Arkel (iv) Solvay Choose the correct answer from the option given below:$ (1) $(1)-(iii), (2)-(ii), (3)-(i), (4)-(iv)$ (2) $(1)-(iv), (2)-(iii), (3)-(i), (4)-(ii)$ (3) $(1)-(iv), (2)-(i), (3)-(ii), (4)-(iii)$ (4) $(1)-(i), (2)-(iii), (3)-(iv), (4)-(ii)$ 102. $The structural formula of hypophosphorous acid is$ (1) $HO - P (= O) (H) - OH$ (2) $HO - P (= O) (OH) - OH$ (3) $H - P (= O) (H) - OH$ (4) $None of these$ 103. $Better method for preparation of B e F_{2}, among the following is$ (1) $BeO + C + F_{2} B e F_{2}$ (2) $(N H_{4})_{2} B e F_{4} B e F_{2}$ (3) $Be+ F_{2} B e F_{2}$ (4) $B e H_{2} + F_{2} B e F_{2}$ 104. $Which one of the following ionic species has the greatest proton affinity to form stable compound$ (1) $I^{-}$ (2) $H S^{-}$ (3) $N H_{2}^{-}$ (4) $F^{-}$ 105. $Which of the following species is not stable?$ (1) $(SiF_{6})^{2 -}$ (2) $(GeCl_{6})^{2 -}$ (3) $(Sn (OH)_{6})^{2 -}$ (4) $(SiCl_{6})^{2 -}$ 106. $P C 1_{5} is well known, but N C 1_{5} is not. Because.$ (1) $nitrogen is less reactive than phosphorous.$ (2) $nitrogen doesn't have d-orbitals in its valence shell.$ (3) $catenation tendency is weaker in nitrogen than phosphorous.$ (4) $size of phosphorous is larger than nitrogen.$ 107. $Given below are two statements: Statement (I): The first ionization enthalpy of group 14 elements is higher than the corresponding elements of group 13. Statement (II): Melting points and boiling points of group 13 elements are in general much higher than those of corresponding elements of group 14. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is correct but Statement II is incorrect$ (2) $Both Statement I and Statement II are incorrect$ (3) $Statement I is incorrect but Statement II is correct$ (4) $Both Statement I and Statement II are correct$ 108. $Each of the following is true for white and red phosphorus except that they$ (1) $are both soluble in C S_{2}$ (2) $can be oxidised by heating in air$ (3) $consist of the same kind of atoms$ (4) $can be converted into one another.$ 109. $In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?$ (1) $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te : Increasing p K_{a} values$ (2) $NH_{3} < PH_{3} < AsH_{3} < SbH_{3} : Increasing acidic character$ (3) $CO_{2} < SiO_{2} < SnO_{2} < PbO_{2} : Increasing oxidizing power$ (4) $HF < HCl < HBr < HI : Increasing acidic strength$ 110. $Amongst the given options, which of the following molecules/ion acts as a Lewis acid?$ (1) $OH^{-}$ (2) $NH_{3}$ (3) $H_{2} O$ (4) $BF_{3}$ 111. $Given below are two statements : Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. choose the correct answer from the options given below.$ (1) $Both statement I and statement II are false$ (2) $Statement I is true but statement II is false$ (3) $Both statement I and statement II are true$ (4) $Statement I is false but statement II is true$ 112. $Which of the following is used in the preparation of chlorine?$ (1) $Both M n O_{2} and K M n O_{4}$ (2) $Only K M n O_{4}$ (3) $Only M n O_{2}$ (4) $Either M n O_{2} or K M n O_{4}$ 113. $C_{60}, an allotrope of carbon cantains:$ (1) $12 hexagons and 20 pentagons.$ (2) $18 hexagons and 14 pentagons.$ (3) $16 hexagons and 16 pentagons.$ (4) $20 hexagons and 12 pentagons.$ 114. $Identify the correct decreasing order of bond dissociation enthalpy.$ (1) $F - F > Cl - Cl > Br - Br > I - I$ (2) $I - I > Br - Br > Cl - Cl > F - F$ (3) $Cl - Cl > F - F > Br - Br > I - I$ (4) $Cl - Cl > Br - Br > F - F > I - I$ 115. $Which of the following is the most basic oxide?$ (1) $S e O_{2}$ (2) $A 1_{2} O_{3}$ (3) $S b_{2} O_{3}$ (4) $B i_{2} O_{3}$ 116. $The ability of a substance to assume two or more crystalline structures is called$ (1) $isomerism$ (2) $polymorphism$ (3) $isomorphism$ (4) $amorphism.$ 117. $Which of the following phosphorus is the most reactive?$ (1) $Scarlet phosphorus$ (2) $White phosphorus$ (3) $Red phosphorus$ (4) $Violet phosphorus$ 118. $Which one of the following statements about the zeolite is false?$ (1) $They are used as cation exchangers.$ (2) $They have open structure which enables them to take up small molecules.$ (3) $Zeolites are aluminosilicates having three-dimensional network.$ (4) $Some of the S i O_{4}^{4 -} units are replaced by A l O_{4}^{5 -} and A l O_{6}^{9 -} ions in zeolites.$ 119. $Which of the following is the increasing order of enthalpy of vaporization ?$ (1) $NH3, PH3, AsH3$ (2) $AsH3, PH3, NH3$ (3) $NH3, AsH3, PH3$ (4) $PH3, AsH3, NH3$ 120. $Identify the element having general electronic configuration n s^{2} n p^{4} from following.$ (1) $Se$ (2) $Br$ (3) $Xe$ (4) $Kr$