p-Block Elements PYQs Set 10 (PDF)

Set 10 of 15 · Questions 271-300 of 423

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Mere Teacher · Previous Year Questions JEE Main Chemistry · p-Block Elements · Set 10 (Q271-300)
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271. $Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3} B. The reducing ability of the hydrides increases in the order NH_{3} < PH_{3} < AsH_{3} < SbH_{3} < BiH_{3} C. Among the hydrides, NH_{3} is strong reducing agent while BiH_{3} is mild reducing agent. D. The basicity of the hydrides increases in the order NH_{3} < PH_{3} < AsH_{3} < SbH_{3} < BiH_{3} Choose the most appropriate from the option given below:$ (1) $B and C only$ (2) $C and D only$ (3) $A and B only$ (4) $A and D only$ 272. $The incorrect statement is$ (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) $The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.$ 273. $Identify the incorrect statements about group 15 elements : (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.(B) The common oxidation states of these elements are - 3, + 3 and +5 .(C) Nitrogen has unique ability to form p π - p π multiple bonds.(D) The stability of +5 oxidation states increases down the group.(E) Nitrogen shows a maximum covalency of 6 . Choose the correct answer from the options given below :$ (1) $(A), (C), (E) only$ (2) $(B), (D), (E) only$ (3) $(D) and (E) only$ (4) $(A), (B), (D) only$ 274. $The incorrect statement is:$ (1) $C l_{2} is more reactive than ClF.$ (2) $F_{2} is more reactive than ClF.$ (3) $On hydrolysis ClFfromsHOCland HF.$ (4) $F2is a stronger oxidizing agent than Cl2 in aqueous solution$ 275. $The correct statements from the following are : (A) The decreasing order of atomic radii of group 13 elements is Tl > In > Ga > Al > B .(B) Down the group 13 electronegativity decreases from top to bottom.(C) Al dissolves in dil. HCl and liberates H_{2} but conc. HNO_{3} renders Al passive by forming a protective oxide layer on the surface.(D) All elements of group 13 exhibits highly stable +1 oxidation state.(E) Hybridisation of Al in (Al (H_{2} O)_{6})^{3 +} ion is sp^{3} d^{2} . Choose the correct answer from the options given below :$ (1) $(A), (C) and (E) only$ (2) $(A) and (C) only$ (3) $(C) and (E) only$ (4) $(A), (B), (C) and (E) only$ 276. $In graphite, electrons are$ (1) $localised on each C ‐atom$ (2) $localised on every third C ‐atom$ (3) $spread out between the structure$ (4) $present in antibonding orbital$ 277. $Choose the correct statement:$ (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) $Diamond is sp^{3} hyridised and graphite is sp^{2} hybridized.$ 278. $Which compound is electron deficient?$ (1) $B e C l_{2}$ (2) $B C l_{3}$ (3) $C C l_{4}$ (4) $P C l_{5}$ 279. $Which one has the lowest boiling point?$ (1) $N H_{3}$ (2) $P H_{3}$ (3) $A s H_{3}$ (4) $S b H_{3}$ 280. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as S_{8} while oxygen exists as O_{2} . Reason (R) : Oxygen forms p π - p π multiple bonds with itself and other elements having small size and high electronegativity like C, N, which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below :$ (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) $Both (A) and (R) are correct but (R) is not the correct explanation of (A)$ 281. $Glass is a$ (1) $liquid$ (2) $solid$ (3) $supercooled liquid$ (4) $transparent organic polymer.$ 282. $Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C to Pb in a regular manner.(B) Electronegativity decreases from C to Pb down the group gradually.(C) Maximum covalance of C is 4 whereas other elements can expand their covalance due to presence of d orbitals.(D) Heavier elements do not form p π - p π bonds.(E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below :$ (1) $(A), (B) and (C) Only$ (2) $(C), (D) and (E) Only$ (3) $(C) and (D) Only$ (4) $(A) and (B) Only$ 283. $Which compound has planar structure?$ (1) $X e F_{4}$ (2) $X e O F_{2}$ (3) $X e O_{2} F_{2}$ (4) $X e O_{4}$ 284. $The amorphous form of silica is:$ (1) $Tridymite$ (2) $Kieselguhr$ (3) $Cristobalite$ (4) $Quartz$ 285. $The angular shape of ozone molecule (O_{3}) consists of$ (1) $1 σ and 1 π bond$ (2) $2 σ and 1 π bond$ (3) $1 σ and 2 π bonds$ (4) $2 σ and 2 π bonds$ 286. $The noble gas that does NOT occur in the atmosphere is:$ (1) $He$ (2) $Kr$ (3) $Ne$ (4) $Ra$ 287. $Which of the following is true for N_{2} O_{5}$ (1) $Paramagnetic$ (2) $Anhydride of H N O_{2}$ (3) $Brown gas$ (4) $Exist in solid state In form of [N O_{2}^{+}] [N O_{3}^{-}]$ 288. $Among the following, the number of halide(s) which is/are inert to hydrolysis is:$ (1) $BF_{3}$ (2) $SiCl_{4}$ (3) $PCl_{5}$ (4) $SF_{6}$ 289. $If the boiling point of H_{2} O is 373K, the boiling point of H_{2} S will be$ (1) $less than 300 K$ (2) $more than 373 K$ (3) $equal to 373 K$ (4) $greater than 300 K but less than 373K$ 290. $The least number of oxyacids are formed by:$ (1) $Nitrogen$ (2) $Fluorine$ (3) $Chlorine$ (4) $Sulphur$ 291. $Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Flourine forms one oxoacid. Reason R : Flourine has smallest size amongst all halogens and is highly electronegative choose the most appropriate answer from the options given$ (1) $Both A and R are correct and R is the correct explanation of A.$ (2) $Both A and R are correct but R is NOT the correct explanation of A.$ (3) $A is correct but R is not correct.$ (4) $A is not correct but R is correct$ 292. $Oleum is$ (1) $castor oil$ (2) $oil of vitriol$ (3) $fuming H_{2} S O_{4}$ (4) $none of these.$ 293. $Oxygen will directly react with each of the following elements except$ (1) $P$ (2) $Cl$ (3) $Na$ (4) $S$ 294. $Strongest hydrogen bonding is shown by$ (1) $water$ (2) $ammonia$ (3) $hydrogen fluoride$ (4) $hydrogen sulphide.$ 295. $The oxide of potassium that does not exist is$ (1) $KO_{2}$ (2) $K_{2} O_{2}$ (3) $K_{2} O_{3}$ (4) $K_{2} O$ 296. $When chlorine is passed over dry slaked lime at room temperature, the main reaction product is$ (1) $C a (C l O_{2})_{2}$ (2) $C a C l_{2}$ (3) $C a O C l_{2}$ (4) $C a (O C l)_{2}$ 297. $Which of the following is planar ?$ (1) $XeO4$ (2) $XeO3F$ (3) $XeO2F2$ (4) $XeF4$ 298. $Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?$ (1) $B r_{2} > I_{2} > F_{2} > C l_{2}$ (2) $F_{2} > C l_{2} > B r_{2} > I_{2}$ (3) $I_{2} > B r_{2} > C l_{2} > F_{2}$ (4) $C l_{2} > B r_{2} > F_{2} > I_{2}$ 299. $The ratio of sigma and π bonds present in pyrophosphoric acid is$ 300. $X e F_{4} reacts with S b F_{5} to form [X e F_{m}]^{n +} [S b F_{y}]^{z -} . m + n + y + z = ?$