s-Block Elements PYQs Set 13 (PDF)

Set 13 of 20 · Questions 361-390 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 13 (Q361-390)
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361. $A gas ‘X’ is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas ‘Y’. Identify ‘X’ and ‘Y’.$ (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) $X = H_{2}, Y = C l_{2}$ 362. $The correct order of sulphur-oxygen bond in SO_{3}, S_{2} O_{3}^{2 -} and SO_{4}^{2 -} is$ (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) $S_{2} O_{3}^{2 -} < SO_{3} < SO_{4}^{2 -}$ 363. $Potassium cyanide is made alkaline with NaOH and boiled with thiosulphate ions. The solutions is cooled and acidified with HCl and this solution with iron (III) chloride produces$ (1) $prussian blue colour solution$ (2) $blood red colour solution$ (3) $dark brown colour solution$ (4) $green colour solution$ 364. $Consider the following statements about group 13 elements A. AlCl_{3} gets stability by forming a dinner B. BCl_{3} is an electron deficient molecule C. E_{M^{3 +} ∣ M}^{0} (V) is +1.26 for aluminium D. In +1 oxidation state thallium is unstable The incorrect statements are$ (1) $C & D only$ (2) $A & B only$ (3) $A & D only$ (4) $B & C only$ 365. $A s-block element (M) reacts with oxygen to form an oxide of the formula M O_{2} . The oxide is pale yellow in colour and paramagnetic. The element (M) is:$ (1) $Mg$ (2) $Na$ (3) $Ca$ (4) $K$ 366. $Oxidation state of S in H_{2} S_{2} O_{8} is$ (1) $8$ (2) $6$ (3) $4$ (4) $7$ 367. $Statement I : Sodium hydride can be used as an oxidising agent. Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below:$ (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) $Both statement I and statement II are true$ 368. $Which of the following elements reacts with water?$ (1) $C$ (2) $Ge$ (3) $Sn$ (4) $Pb$ 369. $The ratio of lone pair of electrons to bond pair of electrons in ozone molecule is$ (1) $2 : 1$ (2) $3 : 2$ (3) $2 : 3$ (4) $1 : 2$ 370. $AlF_{3} is soluble in HF only in the presence of KF due to formation of$ (1) $AlH_{3}$ (2) $(AlH_{6})^{3 -}$ (3) $(AlF_{6})^{3 -}$ (4) $K (AlF_{3} H)$ 371. $Identify the molecules which contains lone pair of electrons on the sulphur atom$ (1) $H_{2} SO_{5}$ (2) $H_{2} S_{2} O_{8}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} SO_{3}$ 372. $Which of the following statement(s) is/are correct? (i) Li NO_{3}, Ba (NO_{3})_{2} both will give NO_{2} on heatiing (ii) BaSO_{4} is less soluble in water than CaSO_{4} (iii) Alkaline earth metals do not dissolve in liquid ammonia$ (1) $i only$ (2) $i, ii only$ (3) $i, ii & iii$ (4) $i, iii only$ 373. $In curing cement plasters, water is sprinkled from-time to time. This helps in :$ (1) $developing interlocking needle like crystals of hydrate silicates$ (2) $hydrated sand gravel mixed with cement$ (3) $converting sand into silicic acid$ (4) $keeping it cool.$ 374. $When graphite is heated at 300^{\circ} C with potassium vapour, it forms C_{8} K compound that shows one of the following property.$ (1) $Conducting and diamagnetic$ (2) $Non-conducting and diamagnetic$ (3) $Conducting and paramagnetic$ (4) $Non-conducting and paramagnetic$ 375. $In the below reaction, geometry of BCl_{3}, X respectively are BCl_{3} + NH_{3} \to X$ (1) $Pyramidal, tetrahedral$ (2) $Pyramidal, octahedral$ (3) $Trigonal planar, tetrahedral$ (4) $Trigonal planar, octahedral$ 376. $Which is the most stable allotrope of sulphur?$ (1) $Octahedral sulphur$ (2) $Monoclinic sulphur$ (3) $Plastic sulphur$ (4) $Colloidal sulphur$ 377. $Which oxo acid of sulphur contains S-O-S bond?$ (1) $H_{2} S_{2} O_{5}$ (2) $H_{2} S_{2} O_{4}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} S_{2} O_{8}$ 378. $On heating which of the following releases C O_{2} most easily?$ (1) $N a_{2} C O_{3}$ (2) $M g C O_{3}$ (3) $C a C O_{3}$ (4) $K_{2} C O_{3}$ 379. $Identify (P) and (Q) in the following reaction. CH_{3} Cl + Si \to Cu - powder 570 K (P) \to H 20 (Q) ⟶ Straight chain polymer$ (1) $P : (CH_{3})_{3} SiCl, Q : (CH_{3})_{3} SiOH$ (2) $P : (CH_{3})_{2} SiCl_{2}, Q : (CH_{3})_{2} Si (OH)_{2}$ (3) $P : (CH_{3})_{2} SiCl_{2}, Q : (CH_{3})_{2} Si (OH) Cl$ (4) $P : (CH_{3})_{2} SiCl_{2}, Q : (CH_{3})_{2} SiO$ 380. $Which of the following is the wrong statement ?$ (1) $ONCl and ONO- are not isoelectronic.$ (2) $O3 molecule is bent$ (3) $Ozone is violet-black in solid state$ (4) $Ozone is diamagnetic gas.$ 381. $XeF_{4} is square planar where as CCl_{4} is tetrahedral because$ (1) $in XeF_{4}, ' Xe ' is s p^{2} hybridised and in CCl_{4}' C ' is s p^{3} hybridised$ (2) $in both XeF_{4} and CCl_{4} the central atom is s p^{3} hybridised$ (3) $in XeF_{4}, ' Xe ' is s p^{3} d^{2} hybridised but due to the presence of 2 lone pairs of electrons shape is square planar whereas in CCl_{4}' C ' is sp^{3} hybridised$ (4) $Xe is noble gas, whereas C is a non-metal$ 382. $The colour of Mg (OH)_{2} precipitate formed when it is precipitated in the presence of magneson reagent is$ (1) $Green$ (2) $Yellow$ (3) $Brown$ (4) $Blue$ 383. $Which statement about noble gases is not correct?$ (1) $' Xe ' forms XeF_{6} under suitable conditions$ (2) $' Ar' is used in electric bulbs$ (3) $The number of lone pair of electrons present on Xe in XeF_{2} is 3 .$ (4) $'He' has the highest boiling point among all the noble gases$ 384. $Thermodynamically most stable allotrope of phosphorus is :$ (1) $Red$ (2) $White$ (3) $Black$ (4) $Yellow$ 385. $Which one of the following methods is used to prepare carbon monoxide on commercial scale?$ (1) $Dehydration of formic acid with conc. H_{2} SO_{4}$ (2) $Direct oxidation of C in limited supply of oxygen$ (3) $Passing steam over hot coke$ (4) $Heating lime stone$ 386. $The compound that does not produce nitrogen gas by the thermal decomposition is :$ (1) $N H_{4} N O_{2}$ (2) $(N H_{4})_{2} S O_{4}$ (3) $Ba (N_{3})_{2}$ (4) $(N H_{4})_{2} C r_{2} O_{7}$ 387. $Consider the following reaction BCl_{3} + NH_{3} ⟶ BCl_{3} \cdot NH_{3} The geometries of BCl_{3} and BCl_{3} \cdot NH_{3} respectively are$ (1) $trigonal planar and tetrahedral$ (2) $tetrahedral and square planar$ (3) $tetrahedral and trigonal bipyramidal$ (4) $square planar and trigonal pyramidal$ 388. $For the reaction Br_{2} + F_{2} (excess) \to P, the molecular formula and structure of P, respectively, are$ (1) $BrF_{5}, Square pyramidal$ (2) $BrF_{4}, Square planar$ (3) $BrF_{3}, Bent T-shaped$ (4) $BrF_{3}, Linear$ 389. $Match the following List-I (Molecule) A. XeF_{4} B. ClF_{3} C. BrF_{5} D. IF_{7} List-II (Shape) I. Square pyramid II. Pentagonal bipyramidal III. Square planar IV. Bent T-Shape$ (1) $A-III; B-II; C-I; D-IV$ (2) $A-III; B-II; C-IV; D-I$ (3) $A-III; B-IV; C-I; D-II$ (4) $A-IV; B-II; C-I; D-III$ 390. $In which of the following, the molecules are arranged in the increasing order of their bond angles?$ (1) $P_{4} < S_{6} < O_{3} < S_{8}$ (2) $S_{6} < O_{3} < S_{8} < P_{4}$ (3) $O_{3} < S_{8} < P_{4} < S_{6}$ (4) $P_{4} < S_{6} < S_{8} < O_{3}$