p-Block Elements PYQs Set 9 (PDF)

Set 9 of 14 · Questions 241-270 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 9 (Q241-270)
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.
241. $In a molecule of pyrophosphoric acid, the number P - OH, P = O and P - O - P bonds/moiety (ies) respectively are$ (1) $4, 2 and 0$ (2) $4, 2 and 1$ (3) $3, 3 and 3$ (4) $2, 4 and 1$ 242. $Match List I with List II List I Oxide (A) N_{2} O_{4} (B) NO (C) N_{2} O_{5} (D) N_{2} O List II Type of bond (I) 1N = O bond (II) 1N - O -N bond (III) 1N- N bond (IV) 1N = N/N = N bond Choose the correct answer from the options given below :$ (1) $A - III, B - I, C - II, D - IV$ (2) $A - II, B - IV, C - III, D - I$ (3) $A - III, B - I, C - IV, D - II$ (4) $A - II, B - I, C - III, D - IV$ 243. $Given below are two statements: Statement I: The N - N single bond is weaker and longer than that of P-P single bond. Statement II: Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions. In the light of the above statements, choose the correct answer from the options given below$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is true but Statement II is false$ 244. $Identify the correct statement for B_{2} H_{6} from those given below (A) In B_{2} H_{6}, all B-H bonds are equivalent. (B) In B_{2} H_{6} there are four 3-centre-2-electron bonds. (C) B_{2} H_{6} is a Lewis acid. (D) B_{2} H_{6} can be synthesized form both B F_{3} and N a B H_{4} . (E) B_{2} H_{6} is a planar molecule. Choose the most appropriate answer from the options given below :$ (1) $(A) and (E) only$ (2) $(B), (C) and (E) only$ (3) $(C) and (D) only$ (4) $(C) and (E) only$ 245. $The incorrect statement from the following for borazine is:$ (1) $It contains banana bonds$ (2) $It can react with water$ (3) $It is a cyclic compound$ (4) $It has electronic delocalization$ 246. $Elements ofwhich ofthe following groups will form anions most readily?$ (1) $Oxygen family$ (2) $Nitrogen family$ (3) $Halogens$ (4) $Alkali metals$ 247. $Which of the following species has four lone pairs of electrons?$ (1) $I$ (2) $O$ (3) $C l^{-}$ (4) $He$ 248. $The reaction of concentrated sulphuric acid with carbohydrates (C_{12} H_{22} O_{11}) is an example of$ (1) $Oxidation$ (2) $Reduction$ (3) $Sulphonation$ (4) $Dehydration$ 249. $One mole of P_{4} reacts with 8 moles of SOC l_{2} to give 4 moles of A, x mole of S O_{2} and 2 moles of B. A, B and x respectively are$ (1) $POC l_{3}, S_{2} C l_{2} and 2$ (2) $PC l_{3}, S_{2} C l_{2} and 4$ (3) $PC l_{3}, S_{2} C l_{2} and 2$ (4) $POC l_{3}, S_{2} C l_{2} and 4$ 250. $Among the following which is the strongest. oxidising agent?$ (1) $B r_{2}$ (2) $I_{2}$ (3) $C l_{2}$ (4) $F_{2}$ 251. $The correct order of catenation is:$ (1) $C > Sn > Si \approx Ge$ (2) $C > Si > Ge \approx Sn$ (3) $Si > Sn > C > Ge$ (4) $Ge > Sn > Si > C$ 252. $The C - C bond length is maximum in:$ (1) $graphite$ (2) $C_{70}$ (3) $C_{60}$ (4) $diamond$ 253. $Given below are two statements: Statement I: Elements ' X^{’} and ' Y' are the most and least electronegative elements, respectively among N, As, Sb and P. The nature of the oxides X_{2} O_{3} and Y_{2} O_{3} is acidic and amphoteric, respectively. Statement II: BCl_{3} is covalent in nature and gets hydrolysed in water. It produces (B (OH)_{4})^{-} and (B (H_{2} O)_{6})^{3 +} in aqueous medium. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Both Statement I and Statement II are false$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is true but Statement II is false$ (4) $Statement I is false but Statement II is true$ 254. $Given below are two statements : Statement I: The number of pairs among (SiO_{2}, CO_{2}), (SnO, SnO_{2}), (PbO, PbO_{2}) and (GeO, GeO_{2}), which contain oxides that are both amphoteric is 2 . Statement II: BF_{3} is an electron deficient molecule, can act as a Lewis acid, forms adduct with NH_{3} and has a trigonal planar geometry. In the light of the above statements, choose the correct answer from the options given below:$ (1) $Statement I is true but Statement II is false$ (2) $Both Statement I and Statement II are true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is false but Statement II is true$ 255. $Wilkinson catalyst is:$ (1) $((Ph_{3} P)_{3} IrCl)$ (2) $((Et_{3} P)_{3} RhCl)$ (3) $((Ph_{3} P)_{3} RhCl)$ (4) $((Et_{3} P)_{3} IrCl)$ 256. $Which of the following is not true ?$ (1) $Among halide ions, iodide ion is the most powerful reducing agent$ (2) $Fluorine is the only halogen which does not show a variable oxidation state$ (3) $HOCl is a stronger acid than HOBr$ (4) $HF is a stronger acid than HCl$ 257. $Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3} B. The reducing ability of the hydrides increases in the order NH_{3} < PH_{3} < AsH_{3} < SbH_{3} < BiH_{3} C. Among the hydrides, NH_{3} is strong reducing agent while BiH_{3} is mild reducing agent. D. The basicity of the hydrides increases in the order NH_{3} < PH_{3} < AsH_{3} < SbH_{3} < BiH_{3} Choose the most appropriate from the option given below:$ (1) $B and C only$ (2) $C and D only$ (3) $A and B only$ (4) $A and D only$ 258. $The incorrect statement is$ (1) $The first ionization enthalpy of K is less than that of Na and Li$ (2) $Xe does not have the lowest first ionization enthalpy in its group$ (3) $The first ionization enthalpy of element with atomic number 37 is lower than that of the element with atomic number 38.$ (4) $The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.$ 259. $Identify the incorrect statements about group 15 elements : (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.(B) The common oxidation states of these elements are - 3, + 3 and +5 .(C) Nitrogen has unique ability to form p π - p π multiple bonds.(D) The stability of +5 oxidation states increases down the group.(E) Nitrogen shows a maximum covalency of 6 . Choose the correct answer from the options given below :$ (1) $(A), (C), (E) only$ (2) $(B), (D), (E) only$ (3) $(D) and (E) only$ (4) $(A), (B), (D) only$ 260. $The incorrect statement is:$ (1) $C l_{2} is more reactive than ClF.$ (2) $F_{2} is more reactive than ClF.$ (3) $On hydrolysis ClFfromsHOCland HF.$ (4) $F2is a stronger oxidizing agent than Cl2 in aqueous solution$ 261. $The correct statements from the following are : (A) The decreasing order of atomic radii of group 13 elements is Tl > In > Ga > Al > B .(B) Down the group 13 electronegativity decreases from top to bottom.(C) Al dissolves in dil. HCl and liberates H_{2} but conc. HNO_{3} renders Al passive by forming a protective oxide layer on the surface.(D) All elements of group 13 exhibits highly stable +1 oxidation state.(E) Hybridisation of Al in (Al (H_{2} O)_{6})^{3 +} ion is sp^{3} d^{2} . Choose the correct answer from the options given below :$ (1) $(A), (C) and (E) only$ (2) $(A) and (C) only$ (3) $(C) and (E) only$ (4) $(A), (B), (C) and (E) only$ 262. $In graphite, electrons are$ (1) $localised on each C ‐atom$ (2) $localised on every third C ‐atom$ (3) $spread out between the structure$ (4) $present in antibonding orbital$ 263. $Choose the correct statement:$ (1) $Both diamond and graphite are used as dry lubricants.$ (2) $Diamond and graphite have two dimensional network$ (3) $Diamond is covalent and graphite is ionic$ (4) $Diamond is sp^{3} hyridised and graphite is sp^{2} hybridized.$ 264. $Which compound is electron deficient?$ (1) $B e C l_{2}$ (2) $B C l_{3}$ (3) $C C l_{4}$ (4) $P C l_{5}$ 265. $Which one has the lowest boiling point?$ (1) $N H_{3}$ (2) $P H_{3}$ (3) $A s H_{3}$ (4) $S b H_{3}$ 266. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as S_{8} while oxygen exists as O_{2} . Reason (R) : Oxygen forms p π - p π multiple bonds with itself and other elements having small size and high electronegativity like C, N, which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $(A) is correct but (R) is not correct$ (2) $(A) is not correct but (R) is correct$ (3) $Both (A) and (R) are correct and (R) is the correct explanation of (A)$ (4) $Both (A) and (R) are correct but (R) is not the correct explanation of (A)$ 267. $Glass is a$ (1) $liquid$ (2) $solid$ (3) $supercooled liquid$ (4) $transparent organic polymer.$ 268. $Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C to Pb in a regular manner.(B) Electronegativity decreases from C to Pb down the group gradually.(C) Maximum covalance of C is 4 whereas other elements can expand their covalance due to presence of d orbitals.(D) Heavier elements do not form p π - p π bonds.(E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below :$ (1) $(A), (B) and (C) Only$ (2) $(C), (D) and (E) Only$ (3) $(C) and (D) Only$ (4) $(A) and (B) Only$ 269. $Which compound has planar structure?$ (1) $X e F_{4}$ (2) $X e O F_{2}$ (3) $X e O_{2} F_{2}$ (4) $X e O_{4}$ 270. $The amorphous form of silica is:$ (1) $Tridymite$ (2) $Kieselguhr$ (3) $Cristobalite$ (4) $Quartz$