s-Block Elements PYQs Set 12 (PDF)

Set 12 of 20 · Questions 331-360 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 12 (Q331-360)
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331. $The last element of the p -block in 6^{th} period is represented by the outer most electronic configuration.$ (1) $5 f^{14} 6 d^{10} 7 s^{2} 7 p^{6}$ (2) $4 f^{14} 5 d^{10} 6 s^{2} 6 p^{6}$ (3) $4 f^{14} 5 d^{10} 6 s^{2} 6 p^{4}$ (4) $7 s^{2} 7 p^{6}$ 332. $Identify the incorrect reaction from the following$ (1) $2 NaNO_{3} \to 2 NaNO_{2} + O_{2}$ (2) $2 LiNO_{3} \to 2 LiNO_{2} + O_{2}$ (3) $2 Pb (NO_{3})_{2} \to 2 PbO + 4 NO_{2} + O_{2}$ (4) $4 LiNO_{3} \to 2 Li_{2} O + 4 NO_{2} + O_{2}$ 333. $Which ofthe following oxides is not expected to react with sodium hydroxide?$ (1) $C a O$ (2) $S i O_{2}$ (3) $B e O$ (4) $B_{2} O_{3}$ 334. $The moisture present in ammonia can be removed by using which of the following?$ (1) $P_{4} O_{10}$ (2) $Conc. H_{2} SO_{4}$ (3) $CaCl_{2} (anhydrous)$ (4) $CaO$ 335. $Which of the following statement is wrong?$ (1) $The stability of hydrides increase from N H_{3} to B i H_{3} in group 15 of the periodic table :$ (2) $Nitrogen cannot form dπ-pπ bond.$ (3) $Single N - N bond is weaker than the single P - P bond.$ (4) $N_{2} O_{4} has two resonance structure$ 336. $Which one of the following properties of alkali metals increases in magnitude as the atomic number rises?$ (1) $Ionic radius$ (2) $Melting point$ (3) $Electronegativity$ (4) $First ionization energy$ 337. $Arrange the following oxides in correct order of their acidic character. N_{2} O_{3}, P_{2} O_{3}, N_{2} O_{5}, As_{2} O_{3} I II III IV$ (1) $I > III > II > IV$ (2) $III > I > II > IV$ (3) $IV > II > I > III$ (4) $III > I > IV > II$ 338. $The compound(s) formed upon combustion of sodium metal in excess air is(are)$ (1) $N a_{2} O_{2}$ (2) $N a_{2} O$ (3) $N a O_{2}$ (4) $NaOH$ 339. $When copper metal is treated with cold and dilute nitric acid, it forms$ (1) $NO$ (2) $N_{2} O$ (3) $N_{2} O_{5}$ (4) $NO_{3}$ 340. $Aluminium when treated with aqueous NaOH, liberates a gaseous molecule majorly. The gas is$ (1) $H_{2}$ (2) $O_{2}$ (3) $D_{2}$ (4) $O_{3}$ 341. $For alkali metals, which one of the following trends is incorrect?$ (1) $Hydration energy : Li > Na > K > Rb$ (2) $Ionization energy: Li > Na > K > Rb$ (3) $Density : Li < Na < K < Rb$ (4) $Atomic size : Li < Na < K < Rb$ 342. $Identify A and B from the following reaction NaNO_{3} Δ x A + y B$ (1) $NaNO_{2}, O_{2}$ (2) $Na_{2} O, NO_{2}$ (3) $Na_{2} O, NO$ (4) $Na, NO_{2}$ 343. $Identify the incorrect statement among the following.$ (1) $Cl2 reacts with excess of NH3 to give N2 and N H_{4} Cl.$ (2) $Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O.$ (3) $Ozone reacts with SO2 to given SO3.$ (4) $Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O.$ 344. $Given below are two statements Statement I : None of the alkaline earth metal hydroxides dissolve in alkali. Statement II : Solubility of alkaline earth metal hydroxides in water increases down the group. choose the most appropriate answer from the options given below$ (1) $Statement I is comect but Statement II is incorrect.$ (2) $Statement I is incorrect but Statement II is correct.$ (3) $Statement I and Statement II both are incorrect.$ (4) $Statement I and Statement II both are correct.$ 345. $20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?(At. w t . of Mg = 24)$ (1) $96$ (2) $60$ (3) $84$ (4) $75$ 346. $In which allotropes of carbon does each carbon atom form four bonds with other carbon atoms?$ (1) $Graphite$ (2) $Graphite and C_{60}$ (3) $Diamond$ (4) $Diamond and C_{60}$ 347. $The number of P—O—P bonds in cyclic trimetaphosphoric acid is :$ (1) $zero$ (2) $two$ (3) $three$ (4) $four$ 348. $An element A of group 1 shows similarity to an element B belonging to group 2. If A has maximum hydration enthalpy in group 1 then B is:$ (1) $Mg$ (2) $Be$ (3) $Ca$ (4) $Sr$ 349. $Identify the incorrect statement among the following.$ (1) $C l_{2} reacts with excess of N H_{3} to give N_{2} and HCl.$ (2) $B r_{2} reacts with hot and strong NaOH solution to give NaBr, N a B r O_{4} and H_{2} O.$ (3) $Ozone reacts with S O_{2} to given S O_{3} .$ (4) $Silicon reacts with N a O H_{(a q)} in the presence of air to give N a_{2} S i O_{3} and H_{2} O.$ 350. $The oxoacid of phosphorous which contains 4 P - O - H, 2 P = O and one P - O - P bond is$ (1) $Orthophosphoric acid$ (2) $Metaphosphoric acid$ (3) $Pyrophosphoric acid$ (4) $Hypophosphoric acid$ 351. $The Lewis structure for O_{3} molecule is given below. The correct formal charges on oxygen atoms labelled 1, 2, 3 are respectively.$ (1) $- 1, 0, + 1$ (2) $+ 1, 0, - 1$ (3) $+ 1, - 1, 0$ (4) $0, + 1, - 1$ 352. $In which of the following reactions there is no liberation of nitrogen gas$ (1) $N O_{2}^{-} (a q) + N H_{4}^{+} (s) Δ$ (2) $CO (NH_{2})_{2} (s) + HNO_{2} (l) ⟶$ (3) $NH_{3} (g) + NaOCl (aq) \to gelatine$ (4) $(N H_{4})_{2} C r_{2} O_{7} (s) Δ$ 353. $Which of the following nitrates on heating does not give its oxide?$ (1) $LiNO_{3}$ (2) $NaNO_{3}$ (3) $Ba (NO_{3})_{2}$ (4) $Be (NO_{3})_{2}$ 354. $Acidity of BF_{3} can be explained on the basis of which of the following concepts?$ (1) $Arrhenius concept$ (2) $Bronsted-Lowry concept$ (3) $Lewis concept$ (4) $Bronsted-Lowry as well as Lewis concept$ 355. $The total number of paramagnetic gaseous products formed in all the following reactions [A + B + C] (A) NH_{4} NO_{3} Δ Products (B) 3 NaNO_{2} + 3 H_{2} SO_{4} ⟶ Products (C) Pb (NO_{3})_{2} \to 673 K Products$ (1) $0$ (2) $1$ (3) $2$ (4) $3$ 356. $A solid compound X on heating gives C O_{2} gas and a residue. The residue mixed with water forms Y . On passing an excess of C O_{2} through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is$ (1) $C a (H C O_{3})_{2}$ (2) $C a C O_{3}$ (3) $N a_{2} C O_{3}$ (4) $K_{2} C O_{3}$ 357. $Decreasing order of number of ionisable hydrogen atoms in the following molecules is I. H_{3} PO_{4} II. H_{3} PO_{3} III. H_{3} PO_{2} IV. H_{4} P_{2} O_{6}$ (1) $II > IV > I > III$ (2) $IV > III > II > I$ (3) $IV > I > II > III$ (4) $II > IV > III > I$ 358. $Match the following List I (Compound) A. H_{3} BO_{3} B. AlCl_{3} C. B_{3} N_{3} H_{6} D. BF_{3} List II (Physical/chemical property/name /structure) 1. Dimeric form 2. Back bonding 3. Hydrogen bonding 4. Inorganic benzene A B C D$ (1) $1 2 3 4$ (2) $3 2 4 1$ (3) $3 1 2 4$ (4) $3 1 4 2$ 359. $The nitrogen containing compound produced in the reaction of H N O_{3} with P_{4} O_{10} .$ (1) $can also be prepared by reaction of P_{4} and H N O_{3}$ (2) $is diamagnetic$ (3) $contains one N-N bond$ (4) $react with Na metal producing a brown gas$ 360. $On heating, LiNOs gives how many compounds among the following? L i_{2} O, N_{2}, O_{2}, L i N O_{2}, N O_{2}$