s-Block Elements PYQs Set 12 (PDF)

Set 12 of 20 · Questions 331-360 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 12 (Q331-360)
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331. $The moisture present in ammonia can be removed by using which of the following?$ (1) $P_{4} O_{10}$ (2) $Conc. H_{2} SO_{4}$ (3) $CaCl_{2} (anhydrous)$ (4) $CaO$ 332. $Which one of the following properties of alkali metals increases in magnitude as the atomic number rises?$ (1) $Ionic radius$ (2) $Melting point$ (3) $Electronegativity$ (4) $First ionization energy$ 333. $Arrange the following oxides in correct order of their acidic character. N_{2} O_{3}, P_{2} O_{3}, N_{2} O_{5}, As_{2} O_{3} I II III IV$ (1) $I > III > II > IV$ (2) $III > I > II > IV$ (3) $IV > II > I > III$ (4) $III > I > IV > II$ 334. $When copper metal is treated with cold and dilute nitric acid, it forms$ (1) $NO$ (2) $N_{2} O$ (3) $N_{2} O_{5}$ (4) $NO_{3}$ 335. $Aluminium when treated with aqueous NaOH, liberates a gaseous molecule majorly. The gas is$ (1) $H_{2}$ (2) $O_{2}$ (3) $D_{2}$ (4) $O_{3}$ 336. $For alkali metals, which one of the following trends is incorrect?$ (1) $Hydration energy : Li > Na > K > Rb$ (2) $Ionization energy: Li > Na > K > Rb$ (3) $Density : Li < Na < K < Rb$ (4) $Atomic size : Li < Na < K < Rb$ 337. $Identify A and B from the following reaction NaNO_{3} Δ x A + y B$ (1) $NaNO_{2}, O_{2}$ (2) $Na_{2} O, NO_{2}$ (3) $Na_{2} O, NO$ (4) $Na, NO_{2}$ 338. $Identify the incorrect statement among the following.$ (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) $Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O.$ 339. $Given below are two statements Statement I : None of the alkaline earth metal hydroxides dissolve in alkali. Statement II : Solubility of alkaline earth metal hydroxides in water increases down the group. choose the most appropriate answer from the options given below$ (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) $Statement I and Statement II both are correct.$ 340. $20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?(At. w t . of Mg = 24)$ (1) $96$ (2) $60$ (3) $84$ (4) $75$ 341. $In which allotropes of carbon does each carbon atom form four bonds with other carbon atoms?$ (1) $Graphite$ (2) $Graphite and C_{60}$ (3) $Diamond$ (4) $Diamond and C_{60}$ 342. $The number of P—O—P bonds in cyclic trimetaphosphoric acid is :$ (1) $zero$ (2) $two$ (3) $three$ (4) $four$ 343. $An element A of group 1 shows similarity to an element B belonging to group 2. If A has maximum hydration enthalpy in group 1 then B is:$ (1) $Mg$ (2) $Be$ (3) $Ca$ (4) $Sr$ 344. $Identify the incorrect statement among the following.$ (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) $Silicon reacts with N a O H_{(a q)} in the presence of air to give N a_{2} S i O_{3} and H_{2} O.$ 345. $The oxoacid of phosphorous which contains 4 P - O - H, 2 P = O and one P - O - P bond is$ (1) $Orthophosphoric acid$ (2) $Metaphosphoric acid$ (3) $Pyrophosphoric acid$ (4) $Hypophosphoric acid$ 346. $The Lewis structure for O_{3} molecule is given below. The correct formal charges on oxygen atoms labelled 1, 2, 3 are respectively.$ (1) $- 1, 0, + 1$ (2) $+ 1, 0, - 1$ (3) $+ 1, - 1, 0$ (4) $0, + 1, - 1$ 347. $In which of the following reactions there is no liberation of nitrogen gas$ (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) $(N H_{4})_{2} C r_{2} O_{7} (s) Δ$ 348. $Which of the following nitrates on heating does not give its oxide?$ (1) $LiNO_{3}$ (2) $NaNO_{3}$ (3) $Ba (NO_{3})_{2}$ (4) $Be (NO_{3})_{2}$ 349. $Acidity of BF_{3} can be explained on the basis of which of the following concepts?$ (1) $Arrhenius concept$ (2) $Bronsted-Lowry concept$ (3) $Lewis concept$ (4) $Bronsted-Lowry as well as Lewis concept$ 350. $The total number of paramagnetic gaseous products formed in all the following reactions [A + B + C] (A) NH_{4} NO_{3} Δ Products (B) 3 NaNO_{2} + 3 H_{2} SO_{4} ⟶ Products (C) Pb (NO_{3})_{2} \to 673 K Products$ (1) $0$ (2) $1$ (3) $2$ (4) $3$ 351. $A solid compound X on heating gives C O_{2} gas and a residue. The residue mixed with water forms Y . On passing an excess of C O_{2} through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is$ (1) $C a (H C O_{3})_{2}$ (2) $C a C O_{3}$ (3) $N a_{2} C O_{3}$ (4) $K_{2} C O_{3}$ 352. $Decreasing order of number of ionisable hydrogen atoms in the following molecules is I. H_{3} PO_{4} II. H_{3} PO_{3} III. H_{3} PO_{2} IV. H_{4} P_{2} O_{6}$ (1) $II > IV > I > III$ (2) $IV > III > II > I$ (3) $IV > I > II > III$ (4) $II > IV > III > I$ 353. $Match the following List I (Compound) A. H_{3} BO_{3} B. AlCl_{3} C. B_{3} N_{3} H_{6} D. BF_{3} List II (Physical/chemical property/name /structure) 1. Dimeric form 2. Back bonding 3. Hydrogen bonding 4. Inorganic benzene A B C D$ (1) $1 2 3 4$ (2) $3 2 4 1$ (3) $3 1 2 4$ (4) $3 1 4 2$ 354. $A gas ‘X’ is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas ‘Y’. Identify ‘X’ and ‘Y’.$ (1) $X = C O_{2}, Y = C l_{2}$ (2) $X = C l_{2}, Y = C O_{2}$ (3) $X = C l_{2}, Y = H_{2}$ (4) $X = H_{2}, Y = C l_{2}$ 355. $The correct order of sulphur-oxygen bond in SO_{3}, S_{2} O_{3}^{2 -} and SO_{4}^{2 -} is$ (1) $SO_{4}^{2 -} < S_{2} O_{3}^{2 -} < SO_{3}$ (2) $SO_{4}^{2 -} < SO_{3} < S_{2} O_{3}^{2 -}$ (3) $S_{2} O_{3}^{2 -} < SO_{4}^{2 -} < SO_{3}$ (4) $S_{2} O_{3}^{2 -} < SO_{3} < SO_{4}^{2 -}$ 356. $Potassium cyanide is made alkaline with NaOH and boiled with thiosulphate ions. The solutions is cooled and acidified with HCl and this solution with iron (III) chloride produces$ (1) $prussian blue colour solution$ (2) $blood red colour solution$ (3) $dark brown colour solution$ (4) $green colour solution$ 357. $Consider the following statements about group 13 elements A. AlCl_{3} gets stability by forming a dinner B. BCl_{3} is an electron deficient molecule C. E_{M^{3 +} ∣ M}^{0} (V) is +1.26 for aluminium D. In +1 oxidation state thallium is unstable The incorrect statements are$ (1) $C & D only$ (2) $A & B only$ (3) $A & D only$ (4) $B & C only$ 358. $A s-block element (M) reacts with oxygen to form an oxide of the formula M O_{2} . The oxide is pale yellow in colour and paramagnetic. The element (M) is:$ (1) $Mg$ (2) $Na$ (3) $Ca$ (4) $K$ 359. $Oxidation state of S in H_{2} S_{2} O_{8} is$ (1) $8$ (2) $6$ (3) $4$ (4) $7$ 360. $Statement I : Sodium hydride can be used as an oxidising agent. Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below:$ (1) $Both statement I and statement II are false$ (2) $Statement I is true but statement II is false$ (3) $Statement I is false but statement II is true$ (4) $Both statement I and statement II are true$