s-Block Elements PYQs Set 17 (PDF)

Set 17 of 20 · Questions 481-510 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 17 (Q481-510)
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481. $The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO_{4} \cdot 5 H_{2} O,respectively, are$ (1) $6 and 4$ (2) $4 and 1$ (3) $6 and 5$ (4) $5 and 1$ 482. $X_{2} is used in the refining of Ti metal by van Arkel method. Y_{2} does not liberate O_{2} from water and does not form H Y and HO Y with water. X_{2} and Y_{2} are respectively.$ (1) $I_{2}, Cl_{2}$ (2) $Cl_{2}, I_{2}$ (3) $I_{2}, I_{2}$ (4) $Cl_{2}, Cl_{2}$ 483. $Which one of the following is present as an active ingredient in bleaching powder for bleaching action?$ (1) $C a O C l_{2}$ (2) $C a (O C l)_{2}$ (3) $CaOCl$ (4) $C a C 1_{2}$ 484. $Which of the following ions possesses S - O - S bond?$ (1) $S_{2} O_{3}^{2 -}$ (2) $SO_{4}^{2 -}$ (3) $S_{2} O_{8}^{2 -}$ (4) $S_{2} O_{7}^{2 -}$ 485. $Which of the following reaction is correct ?$ (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) $2 L i N O_{3} 2Li + 2 N O_{2} + O_{2}$ 486. $When gypsum is heated to 393 K, it forms :$ (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) $Dead burnt plaster$ 487. $What oxoacid of sulphur contains S - S bond in its structure?$ (1) $Disulphurous acid$ (2) $Disulphuric acid$ (3) $Perdisulphuric acid$ (4) $none of the above$ 488. $The catalyst used in Decons process is :$ (1) $C u C l_{2}$ (2) $Cu$ (3) $C u S O_{4}$ (4) $CuS$ 489. $A pale blue liquid is obtained by equimolar mixture of two gases at -30ºC.$ (1) $N_{2} O$ (2) $N_{2} O_{3}$ (3) $N_{2} O_{4}$ (4) $N_{2} O_{5}$ 490. $What is the number of electrons around sulphur in H_{2} SO_{4} molecule?$ (1) $4$ (2) $6$ (3) $10$ (4) $12$ 491. $The bonding in diborane (B_{2} H_{6}) can be described by$ (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) $4 two centre - two electron bonds and 4 three - centre - two electron bonds$ 492. $The correct order of melting point is :$ (1) $Be > Mg > Ca > Sr$ (2) $Sr > Ca > Mg > Be$ (3) $Be > Ca > Mg > Sr$ (4) $Be > Ca > Sr > Mg$ 493. $Magnesium powder burns in air to give:$ (1) $Mg (N O_{3})_{2} and M g_{3} N_{2}$ (2) $MgO and M g_{3} N_{2}$ (3) $Mgo only$ (4) $MgO and Mg (N O_{3})_{2}$ 494. $Washing soda has formula$ (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) $N a_{2} C O_{3}$ 495. $Plaster of Paris is represented as$ (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) $CaSO_{4}$ 496. $White metal is an alloy of$ (1) $Na and Mg$ (2) $Na and Pb$ (3) $Li and Mg$ (4) $Li and Pb$ 497. $The 'dry ice' is\dots\dots\dots..$ (1) $dry CO_{2} gas$ (2) $solid CO_{2}$ (3) $dry SO_{2} gas$ (4) $solid NH_{3}$ 498. $NaH is an example of:$ (1) $Electron - rich hydride$ (2) $Metallic hydride$ (3) $Saline hydride$ (4) $Molecular hydride$ 499. $Dead burnt plaster is$ (1) $CaSO_{4}$ (2) $CaSO_{4} \cdot12H2O$ (3) $CaSO_{4} \cdot H_{2} O$ (4) $CaSO_{4} \cdot 2 H_{2} O$ 500. $Group 16 elements are also called$ (1) $Pnicogens$ (2) $Picogens$ (3) $Halogens$ (4) $Chalocogens$ 501. $The amphoteric hydroxide is:$ (1) $Be (OH)_{2}$ (2) $Ca (OH)_{2}$ (3) $Mg (OH)_{2}$ (4) $Sr (OH)_{2}$ 502. $Incorrectly matched pair is$ (1) $XeF_{4} - tetrahedral$ (2) $XeF_{6} - distorted octahedral$ (3) $XeOF_{4} - square pyramidal$ (4) $XeO_{3} - pyramidal.$ 503. $The s-block element used as a catalyst in the manufacture of Buna- S rubber is$ (1) $Mg$ (2) $Ca$ (3) $Ba$ (4) $Na$ 504. $A colourless neutral, paramagnetic oxide of nitrogen ' P' on oxidation gives reddish brown gas ' Q', ' Q' on cooling gives colourless gas ' R'. ' R' on reaction with ' P' gives blue solid ' S'. Identify P, Q, R and S respectively.$ (1) $N_{2} O, NO, NO_{2}, N_{2} O_{5}$ (2) $N_{2} O, NO_{2}, N_{2} O_{4}, N_{2} O_{3}$ (3) $NO, NO_{2}, N_{2} O_{4}, N_{2} O_{3}$ (4) $NO, NO_{3}, N_{2} O_{4}, N_{2} O_{5}$ 505. $An alkali metal hydride (NaH) reacts with diborane in ' A' to give a tetrahedral compound ' B' which is extensively used as reducing agent in organic synthesis. The compound ' A' and ' B' respectively are$ (1) $CH_{3} COCH_{3} and B_{3} N_{3} H_{6}$ (2) $(C_{2} H_{5})_{2} O and NaBH_{4}$ (3) $C_{2} H_{6} and C_{2} H_{5} Na$ (4) $C_{6} H_{6} and NaBH_{4}$ 506. $Which of the following reactions does not take place?$ (1) $F_{2} + 2 Cl^{-} ⟶ 2 F^{-} + Cl_{2}$ (2) $Br_{2} + 2 I^{-} ⟶ 2 Br^{-} + I_{2}$ (3) $Cl_{2} + 2 Br^{-} ⟶ 2 CI^{-} + Br_{2}$ (4) $Cl_{2} + 2 F^{-} ⟶ 2 Cl^{-} + F_{2}$ 507. $MnO_{2} + HCl \to Δ A_{(g)} A_{(g)} + F_{2 (excess)} \to 573 K B_{(g)} B_{(g)} + U_{(s)} ⟶ C_{(g)} + D_{(g)} The gases A, B, C and D are respectively$ (1) $Cl_{2}, ClF, UF_{6}, CIF_{3}$ (2) $Cl_{2}, CIF_{3}, UF_{6}, ClF$ (3) $O_{2}, OF_{2}, U_{2} O_{3}, O_{2} F_{2}$ (4) $O_{2}, O_{2} F_{2}, U_{2} O_{3}, OF_{2}$ 508. $The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to made teeth enamel harder by converting [3 C a_{3} (P O_{4})_{2} \cdotCa (O H)_{2}] to :$ (1) $[3Ca3(PO4)2\cdotCaF2]$ (2) $[3{Ca(OH)2}\cdotCaF2]$ (3) $[C a F_{2}]$ (4) $[3(CaF2) \cdotCa(OH2]$ 509. $(CH_{3})_{3} SiCl is used duing polymerisation of organosilicons because$ (1) $the chain length of organosilicon polymers can be controlled by adding (CH_{3})_{3} SiCl$ (2) $(CH_{3})_{3} SiCl improves the quality and yield of the polymer$ (3) $(CH_{3})_{3} SiCl does not block the end terminal of silicone polymer$ (4) $(CH_{3})_{3} SiCl acts as a catalyst during polymerisation.$ 510. $Choose the correct order of density of the alkali metals :$ (1) $Li<K<Na<Rb<Cs$ (2) $Li<Na<K<Rb<Cs$ (3) $Cs<Rb<K<Na<Li$ (4) $Li<Na<K<Cs<Rb$