s-Block Elements PYQs Set 13 (PDF)

Set 13 of 20 · Questions 361-390 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 13 (Q361-390)
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361. $Which of the following elements reacts with water?$ (1) $C$ (2) $Ge$ (3) $Sn$ (4) $Pb$ 362. $The ratio of lone pair of electrons to bond pair of electrons in ozone molecule is$ (1) $2 : 1$ (2) $3 : 2$ (3) $2 : 3$ (4) $1 : 2$ 363. $AlF_{3} is soluble in HF only in the presence of KF due to formation of$ (1) $AlH_{3}$ (2) $(AlH_{6})^{3 -}$ (3) $(AlF_{6})^{3 -}$ (4) $K (AlF_{3} H)$ 364. $Identify the molecules which contains lone pair of electrons on the sulphur atom$ (1) $H_{2} SO_{5}$ (2) $H_{2} S_{2} O_{8}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} SO_{3}$ 365. $Which of the following statement(s) is/are correct? (i) Li NO_{3}, Ba (NO_{3})_{2} both will give NO_{2} on heatiing (ii) BaSO_{4} is less soluble in water than CaSO_{4} (iii) Alkaline earth metals do not dissolve in liquid ammonia$ (1) $i only$ (2) $i, ii only$ (3) $i, ii & iii$ (4) $i, iii only$ 366. $In curing cement plasters, water is sprinkled from-time to time. This helps in :$ (1) $developing interlocking needle like crystals of hydrate silicates$ (2) $hydrated sand gravel mixed with cement$ (3) $converting sand into silicic acid$ (4) $keeping it cool.$ 367. $When graphite is heated at 300^{\circ} C with potassium vapour, it forms C_{8} K compound that shows one of the following property.$ (1) $Conducting and diamagnetic$ (2) $Non-conducting and diamagnetic$ (3) $Conducting and paramagnetic$ (4) $Non-conducting and paramagnetic$ 368. $In the below reaction, geometry of BCl_{3}, X respectively are BCl_{3} + NH_{3} \to X$ (1) $Pyramidal, tetrahedral$ (2) $Pyramidal, octahedral$ (3) $Trigonal planar, tetrahedral$ (4) $Trigonal planar, octahedral$ 369. $Which is the most stable allotrope of sulphur?$ (1) $Octahedral sulphur$ (2) $Monoclinic sulphur$ (3) $Plastic sulphur$ (4) $Colloidal sulphur$ 370. $Which oxo acid of sulphur contains S-O-S bond?$ (1) $H_{2} S_{2} O_{5}$ (2) $H_{2} S_{2} O_{4}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} S_{2} O_{8}$ 371. $On heating which of the following releases C O_{2} most easily?$ (1) $N a_{2} C O_{3}$ (2) $M g C O_{3}$ (3) $C a C O_{3}$ (4) $K_{2} C O_{3}$ 372. $Identify (P) and (Q) in the following reaction. CH_{3} Cl + Si \to Cu - powder 570 K (P) \to H 20 (Q) ⟶ Straight chain polymer$ (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) $P : (CH_{3})_{2} SiCl_{2}, Q : (CH_{3})_{2} SiO$ 373. $Which of the following is the wrong statement ?$ (1) $ONCl and ONO- are not isoelectronic.$ (2) $O3 molecule is bent$ (3) $Ozone is violet-black in solid state$ (4) $Ozone is diamagnetic gas.$ 374. $XeF_{4} is square planar where as CCl_{4} is tetrahedral because$ (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) $Xe is noble gas, whereas C is a non-metal$ 375. $The colour of Mg (OH)_{2} precipitate formed when it is precipitated in the presence of magneson reagent is$ (1) $Green$ (2) $Yellow$ (3) $Brown$ (4) $Blue$ 376. $Which statement about noble gases is not correct?$ (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) $'He' has the highest boiling point among all the noble gases$ 377. $Thermodynamically most stable allotrope of phosphorus is :$ (1) $Red$ (2) $White$ (3) $Black$ (4) $Yellow$ 378. $Which one of the following methods is used to prepare carbon monoxide on commercial scale?$ (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) $Heating lime stone$ 379. $The compound that does not produce nitrogen gas by the thermal decomposition is :$ (1) $N H_{4} N O_{2}$ (2) $(N H_{4})_{2} S O_{4}$ (3) $Ba (N_{3})_{2}$ (4) $(N H_{4})_{2} C r_{2} O_{7}$ 380. $Consider the following reaction BCl_{3} + NH_{3} ⟶ BCl_{3} \cdot NH_{3} The geometries of BCl_{3} and BCl_{3} \cdot NH_{3} respectively are$ (1) $trigonal planar and tetrahedral$ (2) $tetrahedral and square planar$ (3) $tetrahedral and trigonal bipyramidal$ (4) $square planar and trigonal pyramidal$ 381. $For the reaction Br_{2} + F_{2} (excess) \to P, the molecular formula and structure of P, respectively, are$ (1) $BrF_{5}, Square pyramidal$ (2) $BrF_{4}, Square planar$ (3) $BrF_{3}, Bent T-shaped$ (4) $BrF_{3}, Linear$ 382. $Match the following List-I (Molecule) A. XeF_{4} B. ClF_{3} C. BrF_{5} D. IF_{7} List-II (Shape) I. Square pyramid II. Pentagonal bipyramidal III. Square planar IV. Bent T-Shape$ (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) $A-IV; B-II; C-I; D-III$ 383. $In which of the following, the molecules are arranged in the increasing order of their bond angles?$ (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) $P_{4} < S_{6} < S_{8} < O_{3}$ 384. $The number of hydrogen atom (s) attached to phosphorus atom in hypophosphorus acid is$ (1) $zero$ (2) $two$ (3) $one$ (4) $three$ 385. $Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?$ (1) $K$ (2) $Rb$ (3) $Li$ (4) $Na$ 386. $Which one among the following statements is correct about a solution of borax in water?$ (1) $It is acidic because it contains H_{3} BO_{3} and NaOH$ (2) $It dissociates into NaBO_{2} and B_{2} O_{3}$ (3) $It is neutral because it contains NaOH and H_{3} BO_{3}$ (4) $It is alkaline because it contains NaOH and H_{3} BO_{3}$ 387. $The products formed during thermal decomposition of ammonium dichromate are$ (1) $O_{2}, H_{2} O, Cr (OH)_{3}$ (2) $NO_{2}, H_{2} O, Cr_{2} O_{3}$ (3) $N_{2}, Cr_{2} O_{3}, H_{2} O$ (4) $N_{2} O, Cr (OH)_{3}$ 388. $Identify the correct statements from the following :I. is an amphoteric oxide.II. The dimer of aluminium chloride has three bridge bonds.III. Boron is very hard refractory solid of high melting temperature.$ (1) $I, II only$ (2) $I, III only$ (3) $II, III only$ (4) $I, II, III$ 389. $White phosphorus is heated with concentrated NaOH in CO_{2} atmosphere to form a gas A and compound B . When A is bubbled into aqueous CuSO_{4} solution copper phosphide and C are formed, B and C are respectively$ (1) $PH_{3}, H_{2} SO_{4}$ (2) $NaH_{2} PO_{2}, H_{2} SO_{4}$ (3) $NaHPO_{2}, CuS$ (4) $NaH_{2} PO_{2}, Cu_{2} S$ 390. $Xe (g) + F_{2} (g) \frac{573 K}{60 - 70 bar} X (s) (1 : 20) X + H_{2} O \to Y + HF X + 3 H_{2} O \to Z + HF The correct statements regarding Y and Z are (I) Y has square pyramidal geometry (II) Y has linear geometry (III) Z has 3 σ, 3 π bonds and 1 lone pair of electrons on the central atom (IV) Z has tetrahedral geometry$ (1) $I & III only$ (2) $II & III only$ (3) $III & IV only$ (4) $I & IV only$