s-Block Elements PYQs Set 19 (PDF)

Set 19 of 20 · Questions 541-570 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 19 (Q541-570)
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541. $A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H_{2} O gives a colorless gas which when passed through C u S O_{4} solution gives a dark blue-violet coloured solution. A and B respectively, are :$ (1) $Mg and M g_{3} N_{2}$ (2) $Na and N a N O_{3}$ (3) $Mg and Mg (N O_{3})_{2}$ (4) $Na and N a_{3} N$ 542. $Match the following List-I (molecule/ion) (A) XeF_{2} (B) XeO_{3} (C) XeF_{4} (D) PF_{6}^{-} List-II (Number of lone pairs of electrons on the central atom (I) 2 (II) 0 (III) 3 (IV) 1 The correct answer is$ (1) $A-III, B-IV, C-I, D-II$ (2) $A-I, B-II, C-IV, D-III$ (3) $A-II, B-I, C-III, D-IV$ (4) $A-III, B-IV, C-II, D-I$ 543. $Compound A reacts with N H_{4} C1 and forms a compound B. Compound B reacts with H_{2} O and excess of C O_{2} to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A. B and C, are respectively.$ (1) $C a C l_{2}, N H_{3}, N H_{4} H C O_{3}$ (2) $C a C l_{2}, NHT, (N H_{4})_{2} C O_{3}$ (3) $Ca (O H)_{2}, N H_{3}, N H_{4} H C O_{3}$ (4) $Ca (O H)_{2}, NH_{4}^{+}, (N H_{4})_{2} C O_{3}$ 544. $Which of the following compounds of xenon has pyramidal geometry?$ (1) $XeF_{2}$ (2) $XeF_{4}$ (3) $XeOF_{4}$ (4) $XeO_{3}$ 545. $Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is :$ (1) $0$ (2) $1$ (3) $2$ (4) $3$ 546. $In the following, the oxoacid with a peroxy bond is$ (1) $H_{2} S_{2} O_{5}$ (2) $H_{2} S_{2} O_{6}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} S_{2} O_{8}$ 547. $The gas produced by the passage of air over hot coke is$ (1) $carbon monoxide$ (2) $carbon dioxide$ (3) $produced gas$ (4) $water gas$ 548. $What is the geometry of molecule of bromine pentafluoride?$ (1) $Square planar$ (2) $Trigonal bipyramidal$ (3) $Square pyramidal$ (4) $Octahedral$ 549. $The P - P - P bond angle in P_{4} and S - S - S bond angle in cyclo S_{8} molecule are respectively$ (1) $107^{\circ}, 60^{\circ}$ (2) $60^{\circ}, 40^{\circ}$ (3) $60^{\circ}, 107^{\circ}$ (4) $40^{\circ}, 60^{\circ}$ 550. $On treating SO_{2} with aqueous solution of KMnO_{4}, the manganese ion reduces to$ (1) $Mn^{2 +} only$ (2) $Mn^{4 +} only$ (3) $Mn^{6 +} only$ (4) $Mn^{4 +} and Mn^{6 +}$ 551. $A few grams of sodium carbonate is added to 1 L of water. What is the pH or pH range of resultant solution?$ (1) $7 - 14$ (2) $7.0$ (3) $1.0$ (4) $1 - 4$ 552. $CaCO_{3} was reacted with dil HCl to form three products. One of the products formed, when passed into slaked lime gave X . What is X ?$ (1) $CaCl_{2}$ (2) $CaCO_{3}$ (3) $Ca (OH)_{2}$ (4) $Ca (HCO_{3})_{2}$ 553. $Which of the following is known as silicone?$ (1) (2) (3) $Polymer of SiO_{2}$ (4) $Polymer of (SiO_{4})^{4 -}$ 554. $The number of bonds between sulphur and oxygen atoms in S_{2} O_{8}^{2-} and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :$ (1) $8 and 8$ (2) $8 and 6$ (3) $4 and 6$ (4) $4 and 8$ 555. $Electronic configuration of calcium atom may be written as$ (1) $[Ne] 4 p^{2}$ (2) $[Ar] 4 s^{2}$ (3) $[Ne] 4 s^{2}$ (4) $[Ar] 4 p^{2}$ 556. $When PbO_{2} reacts with concentrated HNO_{3}, the gas evolved is$ (1) $NO_{2}$ (2) $O_{2}$ (3) $N_{2}$ (4) $N_{2} O$ 557. $Identify the correct statement(s) from the following: I. The catenation property of group 14 elements decreases from carbon to tin. II. Fullerene (C_{60}) has 20 five-membered carbon rings and 12 six-membered carbon rings. III. SiO_{2} is soluble in conc. NaOH .$ (1) $Only II$ (2) $I, III$ (3) $I, II$ (4) $II, III$ 558. $Gas ' X' is obtained on heating KClO_{3} with catalyst MnO_{2} . This gas (in excess) on reaction with white phosphorus forms an acidic oxide ' Y'. ' Y' on dissolving in water forms a compound ' Z'. Identify X, Y and Z .$ (1) $O_{2}, P_{2} O_{5}, H_{3} PO_{4}$ (2) $O_{3}, P_{2} O_{5}, H_{3} PO_{4}$ (3) $O_{2}, P_{2} O_{3}, H_{3} PO_{3}$ (4) $O_{2}, P_{2} O_{5}, H_{3} PO_{3}$ 559. $Which of the following compounds are formed, when boron trichloride is treated with water?$ (1) $H_{3} BO_{3} + HCl$ (2) $B_{2} H_{6} + HCl$ (3) $B_{2} O_{3} + HCl$ (4) $HBO_{3} + HCl$ 560. $The hottest region of Bunsen flame shown in the figure below is:$ (1) $region 2$ (2) $region 3$ (3) $region 4$ (4) $region 1$ 561. $Observe the following reactions Dimer Vapour phase MCl_{2} 1200 K linear monomer. What is M?$ (1) $Ca$ (2) $Sr$ (3) $Mg$ (4) $Be$ 562. $The products formed during the reaction of carbon with conc. H_{2} SO_{4} are$ (1) $CO, SO_{2}, H_{2} O$ (2) $CO_{2}, SO_{2}, H_{2} O$ (3) $CO, CO_{2}, H_{2} O$ (4) $SO_{2}, H_{2} O$ 563. $When orthoboric acid (H_{3} BO_{3}) is subjected to strong heating, the residue left is$ (1) $diborane$ (2) $boron$ (3) $boric anhydride$ (4) $borax$ 564. $Thermal decomposition of lithium nitrate gives$ (1) $LiO_{2}, O_{2}, NO_{2}$ (2) $Li_{2} O, O_{2}, N_{2} O$ (3) $Li_{2} O, O_{2}, N_{2}$ (4) $Li_{2} O, O_{2}, NO_{2}$ 565. $White metal is an alloy of$ (1) $Li&Mg$ (2) $Li& Pb$ (3) $Pb&Sn$ (4) $Pb&Al$ 566. $The amphoteric hydroxide is:$ (1) $Sr (O H)_{2}$ (2) $Mg (O H)_{2}$ (3) $Ca (O H)_{2}$ (4) $Be (O H)_{2}$ 567. $Dry ice is$ (1) $solid CO$ (2) $solid CO_{2}$ (3) $solid SO_{2}$ (4) $solid O_{2} .$ 568. $Identify the incorrect statement:$ (1) $Rhombic and monoclinic sulphur have S_{8} molecules.$ (2) $S_{8} ring has a crown shape.$ (3) $S_{2} is paramagnetic like oxygen.$ (4) $The S-S-S bond angles in the S_{8} and S_{6} rings are the same.$ 569. $Calgon is$ (1) $Na_{2} HPO_{4}$ (2) $Na_{3} PO_{4}$ (3) $Na_{2} P_{6} O_{18}$ (4) $NaH_{2} PO_{4}$ 570. $The amphoteric hydroxide is:$ (1) $Sr (O H)_{2}$ (2) $Mg (O H)_{2}$ (3) $Ca (O H)_{2}$ (4) $Be (O H)_{2}$