p-Block Elements PYQs Set 8 (PDF)

Set 8 of 15 · Questions 211-240 of 423

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Mere Teacher · Previous Year Questions JEE Main Chemistry · p-Block Elements · Set 8 (Q211-240)
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211. $It is noticed that Pb^{2 +} is more stable than Pb^{4 +} but Sn^{2 +} is less stable than Sn^{4 +} . Observe the following reactions. PbO_{2} + Pb \to 2 PbO; Δ_{r} G^{\circ} (1) SnO_{2} + Sn \to 2 SnO; Δ_{r} G^{\circ} (2) Identify the correct set from the following$ (1) $Δ_{r} G^{\circ} (1) < 0; Δ_{r} G^{\circ} (2) < 0$ (2) $Δ_{r} G^{\circ} (1) > 0; Δ_{r} G^{\circ} (2) > 0$ (3) $Δ_{r} G^{\circ} (1) < 0; Δ_{r} G^{\circ} (2) > 0$ (4) $Δ_{r} G^{\circ} (1) > 0; Δ_{r} G^{\circ} (2) < 0$ 212. $The substance used as a smoke screen in warfare is$ (1) $S i C l_{4}$ (2) $P H_{3}$ (3) $P C l_{5}$ (4) $acetylene.$ 213. $In BrF3 molecule, the lone pairs occupy equatorial positions to minimise$ (1) $lone pair-bond pair repulsions only$ (2) $bond pair-bond pair repulsion only$ (3) $lone pair-lone pair and lone pair-bond pair repulsons$ (4) $lone pair-lone pair repulsions only$ 214. $The number of P-O-P bonds in the structure of phosphorus pentoxide and phosphorus trioxide are respectively$ (1) $6, 6$ (2) $5, 5$ (3) $5, 6$ (4) $6, 5$ 215. $Which of the following is a nitric acid anhydride?$ (1) $NO$ (2) $N O_{2}$ (3) $N_{2} O_{5}$ (4) $N_{2} O_{3}$ 216. $When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to :$ (1) $B_{2} O_{3}$ (2) $Co (B O_{2})_{2}$ (3) $C o B_{4} O_{7}$ (4) $Co[B_{4} O_{5} (O H)_{4}]$ 217. $Given below are two statements: Statement I: Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of pπ - pπ bond with oxygen. Statement II: Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it. In the light of given statements, choose the correct answer from the options given below.$ (1) $Both Statement I and Statement II are true$ (2) $Statement I is true but Statement II is false$ (3) $Statement I is false but Statement II is true$ (4) $Both Statement I and Statement II are False$ 218. $Given below are two statements : Statement-I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas. Statement-II: Sodium nitrite reacts with N H_{4} Cl to give H_{2} O, N_{2} and NaCl. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Statement I is incorrect but Statement II is correct$ (2) $Both the statements I and II are incorrect$ (3) $Statement I is correct but Statement II is incorrect$ (4) $Both the statements I and II are correct$ 219. $Name the two type of the structure of silicate in which one oxygen atom of [S i O_{4}]^{4 -} is shared?$ (1) $Linear chain silicate$ (2) $Sheet silicate$ (3) $Pyrosilicate$ (4) $Three dimensional$ 220. $Which of the following does not give oxygen on heating ?$ (1) $Zn (ClO3)2$ (2) $K2Cr2O7$ (3) $(NH4)2 Cr2O7$ (4) $KClO3$ 221. $Which of the following statement is not correct about diborane?$ (1) $Both the Boron atoms are sp^{2} hybridised.$ (2) $There are two 3 -centre-2-electron bonds.$ (3) $The four terminal B-H bonds are two centre two electron bonds$ (4) $The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.$ 222. $The incorrect statement regarding the reaction given below is$ (1) $The product 'B' formed in the above reaction is p-nitroso compound at low temperature$ (2) $'B' is N-nitroso ammonium compound$ (3) $The reaction occurs at low temperature$ (4) $The electrophile involved in the reaction is N O^{+}$ 223. $The shape of O2F2 is similar to that of :$ (1) $C2F2$ (2) $H2O2$ (3) $H2F2$ (4) $C2H2$ 224. $Match List-I with List-II: List-I (oxoacids of sulphur) (A) Peroxodisulphuric acid (B) Sulphuric acid (C) Pyrosulphuric acid (D) Sulphurous acid List-II (Bonds of Sulphur) (I) Two S-OH, Four S=O, One S-O-S (II) Two S-OH, One S=O (III) Two S-OH, Four S=O, One S-O-O-S (IV) Two S-OH, Two S=O Choose the Correct Answer from the options given Below :$ (1) $(A)-(III); (B)-(IV); (C)-(II); (D)-(I)$ (2) $(A)-(I); (B)-(III); (C)-(II); (D)-(IV)$ (3) $(A)-(III); (B)-(IV); (C)-(I); (D)-(II)$ (4) $(A)-(I); (B)-(III); (C)-(IV); (D)-(II)$ 225. $Reaction of BeO with ammonia and hydrogen fluoride gives 'A' which on thermal decomposition gives B e F_{2} and N H_{4} F. What is 'A' ?$ (1) $(N H_{4})_{2} B e F_{4}$ (2) $H_{3} N B e F_{3}$ (3) $(N H_{4}) B e F_{3}$ (4) $(N H_{4}) B e_{2} F_{5}$ 226. $In which of the following molecules are all the bonds are not equal?$ (1) $N F_{3}$ (2) $C l F_{3}$ (3) $B F_{3}$ (4) $A l F_{3}$ 227. $Strong reducing behaviour of H_{3} P O_{2} is due to$ (1) $high electron gain enthalpy of phosphorus$ (2) $high oxidation state of phosphorus$ (3) $presence of two -OH groups and one P—H bond$ (4) $presence of one -OH group and two P—H bonds.$ 228. $Consider the following reaction : A + alkali \to B (Major Product) If B is an oxoacid of phosphorus with no P-H bond, then A is:$ (1) $White P_{4}$ (2) $Red P_{4}$ (3) $P_{2} O_{3}$ (4) $H_{3} P O_{3}$ 229. $Which of the following bonds will be most polar?$ (1) $N—CI$ (2) $O—F$ (3) $N—F$ (4) $N‐N$ 230. $Urea reacts with water to form A which will decompose to form B . B when passed through Cu^{2 +} (aq), deep blue colour solution C is formed. What is the formula of C from the following?$ (1) $(Cu (NH_{3})_{4})^{2 +}$ (2) $Cu (OH)_{2}$ (3) $CuCO_{3} \cdot Cu (OH)_{2}$ (4) $CuSO_{4}$ 231. $Which of the following statement is true?$ (1) $Silicon exhibits 4 coordination number in its compound.$ (2) $Bond energy of F_{2} is less than C l_{2} .$ (3) $Mn(III) oxidation state is more stable than Mn(II) in aqueous state.$ (4) $Elements of 1 5^{t h} gp shows only + 3 and + 5 oxidation states.$ 232. $Repeated use of which one of the following fertilizers would increase the acidity of the soil?$ (1) $Ammonium sulphate$ (2) $Superphosphate of lime$ (3) $Urea$ (4) $Potassium nitrate$ 233. $The number of P - O - P bonds in H_{4} P_{2} O_{7}, (H P O_{3})_{3}, and P_{4} O_{10} are respectively$ (1) $0, 3, 6$ (2) $0 3 4$ (3) $1, 2, 4$ (4) $1, 3, 6$ 234. $Good reducing nature of H_{3} PO_{2} is attributed to the presence of :$ (1) $Two P - OH bonds$ (2) $One P - H bond$ (3) $Two P - H bonds$ (4) $One P - OH bond$ 235. $When orthophosphoric acid is heated to 60 0^{o} C, the product formed is$ (1) $P H_{3}$ (2) $P_{2} O_{5}$ (3) $H_{3} P O_{3}$ (4) $H P O_{3}$ 236. $Among the following, the pair in which the two species are not isostructural is :$ (1) $SiF4 and SF4$ (2) $IO3- and XeO3$ (3) $BH4- and NH4+$ (4) $PF6- and SF6$ 237. $Which of the following oxoacid of sulphur has - O - O - linkage?$ (1) $H_{2} SO_{4}, sulphuric acid$ (2) $H_{2} S_{2} O_{8}, peroxodisulphuric acid$ (3) $H_{2} S_{2} O_{7}, pyrosulphuric acid$ (4) $H_{2} SO_{3}, sulphurous acid$ 238. $In which of the following molecules, are all the bonds not equal ?$ (1) $NF3$ (2) $ClF3$ (3) $BF3$ (4) $AlF3$ 239. $The number of non-ionisable protons present in the product B obtained from the following reaction is _____. C_{2} H_{5} OH + P C 1_{3} \to C_{2} H_{5} C1 + A A + P C 1_{3} \to B$ 240. $Sum of π -bonds present in peroxodisulphuric acid and pyrosulphuric acid is$