s-Block Elements PYQs Set 16 (PDF)

Set 16 of 20 · Questions 451-480 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 16 (Q451-480)
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451. $Which from following elements is in liquid state at room temperature?$ (1) $Se$ (2) $Br$ (3) $I$ (4) $s$ 452. $Which element from following rapidly loses it's luster in air and tarnishes?$ (1) $Ba$ (2) $Be$ (3) $K$ (4) $Mg$ 453. $Which one of the following forms a basic oxide?$ (1) $B$ (2) $Tl$ (3) $Al$ (4) $Ga$ 454. $The element that forms stable compounds in low oxidation state is$ (1) $Mg$ (2) $Al$ (3) $Ga$ (4) $Tl$ 455. $Among the following oxides, the one which is most basic is$ (1) $Z n O$ (2) $M g O$ (3) $A l_{2} O_{3}$ (4) $N_{2} O_{5}$ 456. $Phosphorous and phosphoric acids are, respectively,______acids.$ (1) $dibasic, tribasic$ (2) $tribasic, tribasic$ (3) $tribasic, dibasic$ (4) $tetrabasic, tribasic$ 457. $Assertion (A) : MgSO_{4} is readily soluble in waterReason (R) : The greater hydration enthalpy of Mg^{2 +} ions overcome its lattice enthalpy.$ (1) $A and R both are correct and R is the correct explanation of A .$ (2) $A and R both are correct but R is not the correct explanation of A .$ (3) $A is correct but R is not correct.$ (4) $A is incorrect but R is correct.$ 458. $The number of six membered carbon rings and five membered carbon rings present in Buckminster fullerene are x and y respectively. The sum of x and y is:$ (1) $32$ (2) $23$ (3) $30$ (4) $42$ 459. $One mole of magnesium nitride on the reaction with an excess of water gives :$ (1) $one mole of ammonia$ (2) $one mole of nitric acid$ (3) $two moles of ammonia$ (4) $two moles of nitric acid.$ 460. $The element that even can diffuse through silica glass is$ (1) $He$ (2) $Ar$ (3) $Kr$ (4) $Xe$ 461. $Chlorides of which metal are soluble in organic solvents:$ (1) $Ca$ (2) $Mg$ (3) $K$ (4) $Be$ 462. $Which of the following statement is incorrect ?$ (1) $Low solubility of LiF in water is due to its small hydration enthalpy.$ (2) $K O_{2} is paramagnetic.$ (3) $Solution of sodium in liquid ammonia is conducting in nature.$ (4) $Sodium metal has higher density than potassium metal$ 463. $In context with beryllium, which one of the following statements is incorrect?$ (1) $It is rendered passive by nitric acid.$ (2) $It forms B e_{2} C .$ (3) $Its salts rarely hydrolyse.$ (4) $Its hydride is electron‐deficient and polymeric.$ 464. $In Castner‐Kellner cell for production of sodium hydroxide$ (1) $brine is electrolyzed using graphite electrodes$ (2) $molten sodium chloride is electrolysed$ (3) $sodium amalgam is formed at mercury cathode$ (4) $brine is electrolyzed with Pt electrodes$ 465. $Two alkali halide salts, ACl and BCl gave crimson red and violet in their flame test respectively. A and B are respectively$ (1) $K, Li$ (2) $Li, K$ (3) $Li, Na$ (4) $Na, K$ 466. $What is the value of ∠ S - S - S in puckered S_{8} rhombic sulphur?$ (1) $107^{\circ} `$ (2) $120^{\circ}$ (3) $104.5^{\circ}$ (4) $60^{\circ}$ 467. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Gypsum is used for making fireproof wall boards, Reason (R) : Gypsum is unstable at high temperatures. choose the correct answer from the options given below :$ (1) $Both (A) and (R) are correct but (R) is not the correct explanation of (A).$ (2) $(A) is correct but (R) is not correct,$ (3) $(A) is not correct but (R) is correct,$ (4) $Both (A) and (R) are correct and (R) is the correct explanation of (A).$ 468. $H_{3} BO_{3} is$ (1) $monobasic and weak Lewis acid$ (2) $monobasic and weak Bronsted acid$ (3) $monobasic and strong Lewis acid$ (4) $tribasic and weak Bronsted acid$ 469. $Which of the following properties is not shown by NO ?$ (1) $It is dimagnetic in gaseous state$ (2) $It is a neutral oxide$ (3) $It combines with oxygen to form nitrogen dioxide$ (4) $It's bond order is 2.5$ 470. $The element with highest electronegativity value after fluorine is$ (1) $Nitrogen$ (2) $Oxygen$ (3) $Chlorine$ (4) $Bromine$ 471. $Which one of the following substance is used in the laboratory for fast drying of neutral gases?$ (1) $Phosphorus pentoxide$ (2) $Active charcoal$ (3) $Anhydrous calcium chloride$ (4) $N a_{3} P O_{4}$ 472. $Which of the following is formed when SO_{3} is absorbed by concentrated H_{2} SO_{4}$ (1) $H_{2} S_{2} O_{8}$ (2) $H_{2} S_{2} O_{3}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} S_{2} O_{5}$ 473. $Among the given group 14 elements, the one with highest density is$ (1) $Carbon$ (2) $Silicon$ (3) $Tin$ (4) $Lead$ 474. $The number of six memberd and five membered rings in Buckminster fullerene respectively is$ (1) $20,12$ (2) $12,20$ (3) $14,18$ (4) $14,11$ 475. $Which of the following can be used to prevent the decomposition of H_{2} O_{2} ?$ (1) $Urea$ (2) $Formaldehyde$ (3) $Formic acid$ (4) $Ethanol$ 476. $Which of the following is known as fusion mixture?$ (1) $Mixture of N a_{2} C O_{3} + N a H C O_{3}$ (2) $N a_{2} C O_{3} .10 H O$ (3) $Mixture of K_{2} C O_{3} + N a_{2} C O_{3}$ (4) $N a H C O_{3}$ 477. $Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in$ (1) $exhibiting maximum covalency in compounds$ (2) $forming polymeric hydrides$ (3) $forming covalent halides$ (4) $exhibiting amphoteric nature in their oxides$ 478. $Which element from following exhibits highest number of allotropes?$ (1) $O$ (2) $S$ (3) $Se$ (4) $Te$ 479. $The correct order of enthalpy of vaporisation of noble gases is$ (1) $Xe > Kr > Ar > Ne > He$ (2) $He > Ne > Kr > Ar > Xe$ (3) $Xe > Ar > He > Ne > Kr$ (4) $Ne > Xe > Kr > He > Ar$ 480. $Identify the reaction in which oxygen is not one of the products$ (1) $XeF_{2} + H_{2} O \to$ (2) $XeF_{4} + H_{2} O \to$ (3) $XeF_{4} + O_{2} F_{2} \to$ (4) $XeF_{6} + H_{2} O \to$