s-Block Elements PYQs Set 20 (PDF)

Set 20 of 20 · Questions 571-584 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 20 (Q571-584)
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571. $The hottest region of Bunsen flame shown in the figure below is:$ (1) $region 2$ (2) $region 3$ (3) $region 4$ (4) $region 1$ 572. $Observe the following reactions Dimer Vapour phase MCl_{2} 1200 K linear monomer. What is M?$ (1) $Ca$ (2) $Sr$ (3) $Mg$ (4) $Be$ 573. $The products formed during the reaction of carbon with conc. H_{2} SO_{4} are$ (1) $CO, SO_{2}, H_{2} O$ (2) $CO_{2}, SO_{2}, H_{2} O$ (3) $CO, CO_{2}, H_{2} O$ (4) $SO_{2}, H_{2} O$ 574. $When orthoboric acid (H_{3} BO_{3}) is subjected to strong heating, the residue left is$ (1) $diborane$ (2) $boron$ (3) $boric anhydride$ (4) $borax$ 575. $Thermal decomposition of lithium nitrate gives$ (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) $Li_{2} O, O_{2}, NO_{2}$ 576. $White metal is an alloy of$ (1) $Li&Mg$ (2) $Li& Pb$ (3) $Pb&Sn$ (4) $Pb&Al$ 577. $The amphoteric hydroxide is:$ (1) $Sr (O H)_{2}$ (2) $Mg (O H)_{2}$ (3) $Ca (O H)_{2}$ (4) $Be (O H)_{2}$ 578. $Dry ice is$ (1) $solid CO$ (2) $solid CO_{2}$ (3) $solid SO_{2}$ (4) $solid O_{2} .$ 579. $Identify the incorrect statement:$ (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) $The S-S-S bond angles in the S_{8} and S_{6} rings are the same.$ 580. $Calgon is$ (1) $Na_{2} HPO_{4}$ (2) $Na_{3} PO_{4}$ (3) $Na_{2} P_{6} O_{18}$ (4) $NaH_{2} PO_{4}$ 581. $The amphoteric hydroxide is:$ (1) $Sr (O H)_{2}$ (2) $Mg (O H)_{2}$ (3) $Ca (O H)_{2}$ (4) $Be (O H)_{2}$ 582. $Which oxyacid of sulphur contains S - S single bond?$ (1) $Oleum$ (2) $Marshall's acid$ (3) $Dithionic acid$ (4) $Thiosulphuric acid$ 583. $The shape of XeF_{6} is$ (1) $square planar$ (2) $distorted octahedral$ (3) $square pyramidal$ (4) $pyramidal.$ 584. $Lithium nitrate on heating gives$ (1) $Li_{2} O + NO_{2}$ (2) $Li_{2} O + NO_{2} + O_{2}$ (3) $LiNO_{2} + O_{2}$ (4) $Li_{2} O_{2} + NO_{2} + O_{2}$