p-Block Elements PYQs Set 11 (PDF)

Set 11 of 15 · Questions 301-330 of 423

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Mere Teacher · Previous Year Questions JEE Main Chemistry · p-Block Elements · Set 11 (Q301-330)
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301. $Which one of the following correctly represents the order of stability of oxides, X_{2} O ; (X = halogen)?$ (1) $Br > Cl > I$ (2) $Br > I > Cl$ (3) $Cl > I > Br$ (4) $I > Cl > Br$ 302. $Which from following statements is not correct?$ (1) $All alkali metals are silvery white.$ (2) $Density of potassium is less than sodium.$ (3) $Compounds of group-1 elements are diamagnetic.$ (4) $Melting point of group-1 elements increase down the group.$ 303. $The metal that has very low melting point and its periodic position is closer to a metalloid is :$ (1) $Al$ (2) $Ga$ (3) $Se$ (4) $In$ 304. $Given below are two statements: Statement I: Chlorine can easily combine with oxygen to from oxides; and the product has a tendency to explode. Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens. choose the correct answer from the options given below.$ (1) $Both the statements I and II are true$ (2) $Statement I is true but Statement II is false$ (3) $Statement I is false but Statement II is true$ (4) $Both the Statements I and II are false$ 305. $The basic structural unit of silicates is$ (1) $S i O_{3}^{2 -}$ (2) $S i O_{4}^{2 -}$ (3) $S i O^{-}$ (4) $S i O_{4}^{4 -}$ 306. $The most stable trihalide of nitrogen is:$ (1) $N F_{3}$ (2) $NCl3$ (3) $N B r_{3}$ (4) $N I_{3}$ 307. $Lithium aluminium hydride can be prepared from the reaction of$ (1) $LiCl and A 1_{2} H_{6}$ (2) $LiH and A 1_{2} C 1_{6}$ (3) $LiCl, Al and H_{2}$ (4) $LiH and Al (O H)_{3}$ 308. $Which ofthe following statements is incorrect?$ (1) $Pure sodium metal dissolves in liquid ammonia to give blue solution.$ (2) $NaOH reacts with glass to give sodium silicate.$ (3) $Aluminium reacts with excess NaOH to give AI(OH).$ (4) $N a H C O_{3} on heating gives N a_{2} C O_{3} .$ 309. $The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is$ (1) $N H_{3}$ (2) $N_{2}$ (3) $N_{2} O$ (4) $C 1_{2}$ 310. $Which of the following oxides of nitrogen is paramagnetic?$ (1) $N O_{2}$ (2) $N_{2} O_{3}$ (3) $N_{2} O$ (4) $N_{2} O_{5}$ 311. $Which one of the following elemental forms is not present in the enamel of the teeth?$ (1) $C a^{2 +}$ (2) $P^{3 +}$ (3) $F^{-}$ (4) $P^{5 +}$ 312. $Which of the following order is wrong?$ (1) $N H_{3} < P H_{3} < A s H_{3} —acidic$ (2) $Li < B e < B < C - 1^{s t} IP$ (3) $A 1_{2} O_{3} < M g O < N a_{2} O < K_{2} O —basic$ (4) $L i^{+} < N a^{+} < K^{+} < C s^{+} —ionic radius.$ 313. $White phosphorus reacts with thionyl chloride to$ (1) $P C 1_{5}, S O_{2} and S_{2} C 1_{2}$ (2) $P C 1_{3} . S O_{2} and S_{2} C 1_{2}$ (3) $P C 1_{3}, S O_{2} and C 1_{2}$ (4) $P C 1_{5}, S 0_{2} and C 1_{2}$ 314. $Which among the following compound does not actas a reducing agent?$ (1) $H_{2} O$ (2) $H_{2} S$ (3) $H_{2} Se$ (4) $H_{2} Te$ 315. $X melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is:$ (1) $Hg$ (2) $ZnS$ (3) $SiC$ (4) $CC l_{4}$ 316. $Which element from following exhibits common oxidation state +2 ?$ (1) $Sr$ (2) $Rb$ (3) $Na$ (4) $Li$ 317. $Element not showing variable oxidation state is :$ (1) $Bromine$ (2) $Iodine$ (3) $Chlorine$ (4) $Fluorine$ 318. $Aqueous solution of ammonia consists of$ (1) $H^{+}$ (2) $O H^{-}$ (3) $N H_{4}^{+}$ (4) $N H_{4}^{+} and OH$ 319. $Arrange the following bonds according to their average bond energies in descending order:$ (1) $C - Cl > C - Br > C - I > C - F$ (2) $C - F < C - Cl < C - Br < C - I$ (3) $C - F > C - Cl > C - Br > C - I$ (4) $C - I < C - Br < C - F < C - Cl$ 320. $The correct order of bond enthalpy (kj m o l^{- 1}) is$ (1) $Si - Si > C - C > Sn - Sn > Ge - Ge$ (2) $Si - Si > C - C > Ge - Ge > Sn - Sn$ (3) $C - C > Si - Si > Sn - Sn > Ge - Ge$ (4) $C - C> Si - Si > Ge - Ge > Sn - Sn$ 321. $Which of the following structure is similar to graphite?$ (1) $B_{4} C$ (2) $B_{2} H_{6}$ (3) $BN$ (4) $B$ 322. $Heating white phosphorus with cone. NaOH solution gives mainly$ (1) $N a_{3} P and H_{2} O$ (2) $H_{3} PO and NaH$ (3) $P (O H)_{3} and N a H_{2} P O_{4}$ (4) $P H_{3} and N a H_{2} P O_{2}$ 323. $Oxidation states of P in H4P2O5, H4P2O6, H4P2O7 are respectively :$ (1) $+3, +5, +4$ (2) $+5, +3, +4$ (3) $+5, +4, +3$ (4) $+3, +4, +5$ 324. $Boric acid in solid, whereas B F_{3} is gas at room temperature because of$ (1) $Strong ionic bond in Boric acid$ (2) $Strong van der Waal's interaction in Boric acid$ (3) $Strong hydrogen bond in Boric acid$ (4) $Strong covalent bond in B F_{3}$ 325. $Which one of the following group-15 hydride is the strongest reducing agent ?$ (1) $A s H_{3}$ (2) $B i H_{3}$ (3) $P H_{3}$ (4) $S b H_{3}$ 326. $Consider the oxides of group 14 elements SiO_{2}, GeO_{2}, SnO_{2}, PbO_{2}, CO and GeO . The amphoteric oxides are$ (1) $GeO, GeO_{2}$ (2) $SiO_{2}, GeO_{2}$ (3) $SnO_{2}, PbO_{2}$ (4) $SnO_{2}, CO$ 327. $Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A :- Carbon forms two important oxides - CO and C O_{2} . CO is neutral whereas C O_{2} is acidic in nature, Reason R :- C O_{2} can combine with water in a limited way to form carbonic acid, while CO is sparingly soluble in water. choose the most appropriate answer from the options given below :-$ (1) $Both A and R are correct but R is NOT the correct explanation of A.$ (2) $Both A and R are correct and R is the correct explanation of A.$ (3) $A is not correct but R is correct,$ (4) $A is correct but R is not correct,$ 328. $Among the following, the correct order of acidic nature is :$ (1) $HCIO4 < HCIO2 < HCIO < HCIO3$ (2) $HCIO3 < HCIO4 < HCIO2 < HCIO$ (3) $HCIO < HCIO2 < HCIO3 < HCIO4$ (4) $HCIO2 < HCIO < HCIO3 < HCIO4$ 329. $On reaction with stronger oxidizing agent like K I O_{4}, hydrogen peroxide oxidizes with the evolution of O_{2} . The oxidation number of I in K I O_{4} changes to______.$ 330. $Total number of acidic oxides among N_{2} O_{3}, N O_{2}, N_{2} O, C 1_{2} O_{7}, S O_{2}, CO, CaO, N a_{2} O and NO is_________,$