s-Block Elements PYQs Set 17 (PDF)

Set 17 of 20 · Questions 481-510 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 17 (Q481-510)
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481. $Which of the following statements is not correct?$ (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) $The bond angle in ozone molecule is 117^{\circ}$ 482. $The metal used for making X-ray tube window is:$ (1) $Mg$ (2) $Na$ (3) $Be$ (4) $Ca$ 483. $To prepare XeF_{6} \cdot Xe and F_{2} are mixed at 573 K and 60 - 70 bar in the ratio of$ (1) $20 : 1$ (2) $1 : 5$ (3) $5 : 1$ (4) $1 : 20$ 484. $Which of the following compound does not give dinitrogen on heating?$ (1) $Ba (N_{3})_{2}$ (2) $NH_{4} NO_{3}$ (3) $NH_{4} NO_{2}$ (4) $(NH_{4})_{2} Cr_{2} O_{7}$ 485. $Calcium is obtained by the$ (1) $electrolysis of solution of calcium chloride in water$ (2) $electrolysis of molten anhydrous calcium chloride$ (3) $roasting of limestone$ (4) $reduction of calcium chloride with carbon.$ 486. $The product formed in the reaction of S O C l_{2} with white phosphorous is$ (1) $P C l_{3}$ (2) $S O_{2} C l_{2}$ (3) $S C l_{2}$ (4) $P O C l_{3}$ 487. $Which of the following represents correct order of oxidizing power of halogens with water$ (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) $F_{2} > Cl_{2} > Br_{2} > I_{2}$ 488. $Which of the following on thermal decomposition yields a basic as well as acidic oxide ?$ (1) $NaNO3$ (2) $KClO3$ (3) $CaCO3$ (4) $NH4NO3$ 489. $The number of S-S bonds, in sulphur trioxide trimer (S_{3} O_{9}) is$ (1) $three$ (2) $two$ (3) $one$ (4) $Zero$ 490. $The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO_{4} \cdot 5 H_{2} O,respectively, are$ (1) $6 and 4$ (2) $4 and 1$ (3) $6 and 5$ (4) $5 and 1$ 491. $X_{2} is used in the refining of Ti metal by van Arkel method. Y_{2} does not liberate O_{2} from water and does not form H Y and HO Y with water. X_{2} and Y_{2} are respectively.$ (1) $I_{2}, Cl_{2}$ (2) $Cl_{2}, I_{2}$ (3) $I_{2}, I_{2}$ (4) $Cl_{2}, Cl_{2}$ 492. $Which one of the following is present as an active ingredient in bleaching powder for bleaching action?$ (1) $C a O C l_{2}$ (2) $C a (O C l)_{2}$ (3) $CaOCl$ (4) $C a C 1_{2}$ 493. $Which of the following ions possesses S - O - S bond?$ (1) $S_{2} O_{3}^{2 -}$ (2) $SO_{4}^{2 -}$ (3) $S_{2} O_{8}^{2 -}$ (4) $S_{2} O_{7}^{2 -}$ 494. $Which of the following reaction is correct ?$ (1) $2 L i N O_{3} 2 L i N O_{7} + O_{7}$ (2) $4 L i N O_{3} L i_{2} O + 2 N_{2} O_{4} + O_{2}$ (3) $4 L i N O_{3} 2 L i_{2} O + 4 N O_{2} + O_{2}$ (4) $2 L i N O_{3} 2Li + 2 N O_{2} + O_{2}$ 495. $When gypsum is heated to 393 K, it forms :$ (1) $Anhydrous C a S O_{4}$ (2) $C a S O_{4} \cdot 0.5 H_{2} O$ (3) $C a S O_{4} \cdot 5 H_{2} O$ (4) $Dead burnt plaster$ 496. $What oxoacid of sulphur contains S - S bond in its structure?$ (1) $Disulphurous acid$ (2) $Disulphuric acid$ (3) $Perdisulphuric acid$ (4) $none of the above$ 497. $The catalyst used in Decons process is :$ (1) $C u C l_{2}$ (2) $Cu$ (3) $C u S O_{4}$ (4) $CuS$ 498. $A pale blue liquid is obtained by equimolar mixture of two gases at -30ºC.$ (1) $N_{2} O$ (2) $N_{2} O_{3}$ (3) $N_{2} O_{4}$ (4) $N_{2} O_{5}$ 499. $Sodium nitrate decomposes above 800°C to give :$ (1) $N_{2}$ (2) $O_{2}$ (3) $N O_{2}$ (4) $N a_{2} O$ 500. $What is the number of electrons around sulphur in H_{2} SO_{4} molecule?$ (1) $4$ (2) $6$ (3) $10$ (4) $12$ 501. $The bonding in diborane (B_{2} H_{6}) can be described by$ (1) $4 two centre - two electron bonds and 2 three - centre two electron bonds$ (2) $3 two centre - two electron bonds and 3 three - centre - two electron bonds$ (3) $2 two centre - two electron bonds and 4 three - centre - two electron bonds$ (4) $4 two centre - two electron bonds and 4 three - centre - two electron bonds$ 502. $The correct order of melting point is :$ (1) $Be > Mg > Ca > Sr$ (2) $Sr > Ca > Mg > Be$ (3) $Be > Ca > Mg > Sr$ (4) $Be > Ca > Sr > Mg$ 503. $Magnesium powder burns in air to give:$ (1) $Mg (N O_{3})_{2} and M g_{3} N_{2}$ (2) $MgO and M g_{3} N_{2}$ (3) $Mgo only$ (4) $MgO and Mg (N O_{3})_{2}$ 504. $Washing soda has formula$ (1) $N a_{2} C O_{3} .7 H_{2} O$ (2) $N a_{2} C O_{3} .10 H_{2} O$ (3) $N a_{2} C O_{3} .3 H_{2} O$ (4) $N a_{2} C O_{3}$ 505. $Plaster of Paris is represented as$ (1) $CaSO_{4} \cdot 2 H_{2} O$ (2) $CaSO_{4} \cdot H_{2} O$ (3) $CaS O_{4} \cdot \frac{1}{2} H_{2} O$ (4) $CaSO_{4}$ 506. $White metal is an alloy of$ (1) $Na and Mg$ (2) $Na and Pb$ (3) $Li and Mg$ (4) $Li and Pb$ 507. $The 'dry ice' is\dots\dots\dots..$ (1) $dry CO_{2} gas$ (2) $solid CO_{2}$ (3) $dry SO_{2} gas$ (4) $solid NH_{3}$ 508. $NaH is an example of:$ (1) $Electron - rich hydride$ (2) $Metallic hydride$ (3) $Saline hydride$ (4) $Molecular hydride$ 509. $Dead burnt plaster is$ (1) $CaSO_{4}$ (2) $CaSO_{4} \cdot12H2O$ (3) $CaSO_{4} \cdot H_{2} O$ (4) $CaSO_{4} \cdot 2 H_{2} O$ 510. $Group 16 elements are also called$ (1) $Pnicogens$ (2) $Picogens$ (3) $Halogens$ (4) $Chalocogens$