s-Block Elements PYQs Set 16 (PDF)

Set 16 of 20 · Questions 451-480 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 16 (Q451-480)
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451. $The element that even can diffuse through silica glass is$ (1) $He$ (2) $Ar$ (3) $Kr$ (4) $Xe$ 452. $Chlorides of which metal are soluble in organic solvents:$ (1) $Ca$ (2) $Mg$ (3) $K$ (4) $Be$ 453. $Which of the following statement is incorrect ?$ (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) $Sodium metal has higher density than potassium metal$ 454. $In context with beryllium, which one of the following statements is incorrect?$ (1) $It is rendered passive by nitric acid.$ (2) $It forms B e_{2} C .$ (3) $Its salts rarely hydrolyse.$ (4) $Its hydride is electron‐deficient and polymeric.$ 455. $In Castner‐Kellner cell for production of sodium hydroxide$ (1) $brine is electrolyzed using graphite electrodes$ (2) $molten sodium chloride is electrolysed$ (3) $sodium amalgam is formed at mercury cathode$ (4) $brine is electrolyzed with Pt electrodes$ 456. $Two alkali halide salts, ACl and BCl gave crimson red and violet in their flame test respectively. A and B are respectively$ (1) $K, Li$ (2) $Li, K$ (3) $Li, Na$ (4) $Na, K$ 457. $What is the value of ∠ S - S - S in puckered S_{8} rhombic sulphur?$ (1) $107^{\circ} `$ (2) $120^{\circ}$ (3) $104.5^{\circ}$ (4) $60^{\circ}$ 458. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Gypsum is used for making fireproof wall boards, Reason (R) : Gypsum is unstable at high temperatures. choose the correct answer from the options given below :$ (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) $Both (A) and (R) are correct and (R) is the correct explanation of (A).$ 459. $H_{3} BO_{3} is$ (1) $monobasic and weak Lewis acid$ (2) $monobasic and weak Bronsted acid$ (3) $monobasic and strong Lewis acid$ (4) $tribasic and weak Bronsted acid$ 460. $Which of the following properties is not shown by NO ?$ (1) $It is dimagnetic in gaseous state$ (2) $It is a neutral oxide$ (3) $It combines with oxygen to form nitrogen dioxide$ (4) $It's bond order is 2.5$ 461. $The element with highest electronegativity value after fluorine is$ (1) $Nitrogen$ (2) $Oxygen$ (3) $Chlorine$ (4) $Bromine$ 462. $Which one of the following substance is used in the laboratory for fast drying of neutral gases?$ (1) $Phosphorus pentoxide$ (2) $Active charcoal$ (3) $Anhydrous calcium chloride$ (4) $N a_{3} P O_{4}$ 463. $Which of the following is formed when SO_{3} is absorbed by concentrated H_{2} SO_{4}$ (1) $H_{2} S_{2} O_{8}$ (2) $H_{2} S_{2} O_{3}$ (3) $H_{2} S_{2} O_{7}$ (4) $H_{2} S_{2} O_{5}$ 464. $Among the given group 14 elements, the one with highest density is$ (1) $Carbon$ (2) $Silicon$ (3) $Tin$ (4) $Lead$ 465. $The number of six memberd and five membered rings in Buckminster fullerene respectively is$ (1) $20,12$ (2) $12,20$ (3) $14,18$ (4) $14,11$ 466. $Which of the following can be used to prevent the decomposition of H_{2} O_{2} ?$ (1) $Urea$ (2) $Formaldehyde$ (3) $Formic acid$ (4) $Ethanol$ 467. $Which of the following is known as fusion mixture?$ (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) $N a H C O_{3}$ 468. $Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in$ (1) $exhibiting maximum covalency in compounds$ (2) $forming polymeric hydrides$ (3) $forming covalent halides$ (4) $exhibiting amphoteric nature in their oxides$ 469. $Which element from following exhibits highest number of allotropes?$ (1) $O$ (2) $S$ (3) $Se$ (4) $Te$ 470. $The correct order of enthalpy of vaporisation of noble gases is$ (1) $Xe > Kr > Ar > Ne > He$ (2) $He > Ne > Kr > Ar > Xe$ (3) $Xe > Ar > He > Ne > Kr$ (4) $Ne > Xe > Kr > He > Ar$ 471. $Identify the reaction in which oxygen is not one of the products$ (1) $XeF_{2} + H_{2} O \to$ (2) $XeF_{4} + H_{2} O \to$ (3) $XeF_{4} + O_{2} F_{2} \to$ (4) $XeF_{6} + H_{2} O \to$ 472. $Which of the following statements is not correct?$ (1) $From SO_{2} to TeO_{2} reducing power decreases$ (2) $The order of boiling points of hydrides of 16th group elements is H_{2} S < H_{2} Se < H_{2} Te < H_{2} O$ (3) $Rhombic sulphur has S_{8} molecules while monoclinic sulphur has S_{6} molecules.$ (4) $The bond angle in ozone molecule is 117^{\circ}$ 473. $The metal used for making X-ray tube window is:$ (1) $Mg$ (2) $Na$ (3) $Be$ (4) $Ca$ 474. $To prepare XeF_{6} \cdot Xe and F_{2} are mixed at 573 K and 60 - 70 bar in the ratio of$ (1) $20 : 1$ (2) $1 : 5$ (3) $5 : 1$ (4) $1 : 20$ 475. $Which of the following compound does not give dinitrogen on heating?$ (1) $Ba (N_{3})_{2}$ (2) $NH_{4} NO_{3}$ (3) $NH_{4} NO_{2}$ (4) $(NH_{4})_{2} Cr_{2} O_{7}$ 476. $Calcium is obtained by the$ (1) $electrolysis of solution of calcium chloride in water$ (2) $electrolysis of molten anhydrous calcium chloride$ (3) $roasting of limestone$ (4) $reduction of calcium chloride with carbon.$ 477. $The product formed in the reaction of S O C l_{2} with white phosphorous is$ (1) $P C l_{3}$ (2) $S O_{2} C l_{2}$ (3) $S C l_{2}$ (4) $P O C l_{3}$ 478. $Which of the following represents correct order of oxidizing power of halogens with water$ (1) $I_{2} > Br_{2} > Cl_{2} > F_{2}$ (2) $Cl_{2} > F_{2} > Br_{2} > I_{2}$ (3) $F_{2} > Cl_{2} > I_{2} > Br_{2}$ (4) $F_{2} > Cl_{2} > Br_{2} > I_{2}$ 479. $Which of the following on thermal decomposition yields a basic as well as acidic oxide ?$ (1) $NaNO3$ (2) $KClO3$ (3) $CaCO3$ (4) $NH4NO3$ 480. $The number of S-S bonds, in sulphur trioxide trimer (S_{3} O_{9}) is$ (1) $three$ (2) $two$ (3) $one$ (4) $Zero$