p-Block Elements PYQs Set 10 (PDF)

Set 10 of 14 · Questions 271-300 of 400

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Mere Teacher · Previous Year Questions NEET Chemistry · p-Block Elements · Set 10 (Q271-300)
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271. $The angular shape of ozone molecule (O_{3}) consists of$ (1) $1 σ and 1 π bond$ (2) $2 σ and 1 π bond$ (3) $1 σ and 2 π bonds$ (4) $2 σ and 2 π bonds$ 272. $The noble gas that does NOT occur in the atmosphere is:$ (1) $He$ (2) $Kr$ (3) $Ne$ (4) $Ra$ 273. $Which of the following is true for N_{2} O_{5}$ (1) $Paramagnetic$ (2) $Anhydride of H N O_{2}$ (3) $Brown gas$ (4) $Exist in solid state In form of [N O_{2}^{+}] [N O_{3}^{-}]$ 274. $Among the following, the number of halide(s) which is/are inert to hydrolysis is:$ (1) $BF_{3}$ (2) $SiCl_{4}$ (3) $PCl_{5}$ (4) $SF_{6}$ 275. $If the boiling point of H_{2} O is 373K, the boiling point of H_{2} S will be$ (1) $less than 300 K$ (2) $more than 373 K$ (3) $equal to 373 K$ (4) $greater than 300 K but less than 373K$ 276. $The least number of oxyacids are formed by:$ (1) $Nitrogen$ (2) $Fluorine$ (3) $Chlorine$ (4) $Sulphur$ 277. $Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Flourine forms one oxoacid. Reason R : Flourine has smallest size amongst all halogens and is highly electronegative choose the most appropriate answer from the options given$ (1) $Both A and R are correct and R is the correct explanation of A.$ (2) $Both A and R are correct but R is NOT the correct explanation of A.$ (3) $A is correct but R is not correct.$ (4) $A is not correct but R is correct$ 278. $Oleum is$ (1) $castor oil$ (2) $oil of vitriol$ (3) $fuming H_{2} S O_{4}$ (4) $none of these.$ 279. $Oxygen will directly react with each of the following elements except$ (1) $P$ (2) $Cl$ (3) $Na$ (4) $S$ 280. $Strongest hydrogen bonding is shown by$ (1) $water$ (2) $ammonia$ (3) $hydrogen fluoride$ (4) $hydrogen sulphide.$ 281. $The oxide of potassium that does not exist is$ (1) $KO_{2}$ (2) $K_{2} O_{2}$ (3) $K_{2} O_{3}$ (4) $K_{2} O$ 282. $When chlorine is passed over dry slaked lime at room temperature, the main reaction product is$ (1) $C a (C l O_{2})_{2}$ (2) $C a C l_{2}$ (3) $C a O C l_{2}$ (4) $C a (O C l)_{2}$ 283. $Which of the following is planar ?$ (1) $XeO4$ (2) $XeO3F$ (3) $XeO2F2$ (4) $XeF4$ 284. $Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?$ (1) $B r_{2} > I_{2} > F_{2} > C l_{2}$ (2) $F_{2} > C l_{2} > B r_{2} > I_{2}$ (3) $I_{2} > B r_{2} > C l_{2} > F_{2}$ (4) $C l_{2} > B r_{2} > F_{2} > I_{2}$ 285. $Which one of the following correctly represents the order of stability of oxides, X_{2} O ; (X = halogen)?$ (1) $Br > Cl > I$ (2) $Br > I > Cl$ (3) $Cl > I > Br$ (4) $I > Cl > Br$ 286. $Which from following statements is not correct?$ (1) $All alkali metals are silvery white.$ (2) $Density of potassium is less than sodium.$ (3) $Compounds of group-1 elements are diamagnetic.$ (4) $Melting point of group-1 elements increase down the group.$ 287. $The metal that has very low melting point and its periodic position is closer to a metalloid is :$ (1) $Al$ (2) $Ga$ (3) $Se$ (4) $In$ 288. $Given below are two statements: Statement I: Chlorine can easily combine with oxygen to from oxides; and the product has a tendency to explode. Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens. choose the correct answer from the options given below.$ (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) $Both the Statements I and II are false$ 289. $The basic structural unit of silicates is$ (1) $S i O_{3}^{2 -}$ (2) $S i O_{4}^{2 -}$ (3) $S i O^{-}$ (4) $S i O_{4}^{4 -}$ 290. $The most stable trihalide of nitrogen is:$ (1) $N F_{3}$ (2) $NCl3$ (3) $N B r_{3}$ (4) $N I_{3}$ 291. $Lithium aluminium hydride can be prepared from the reaction of$ (1) $LiCl and A 1_{2} H_{6}$ (2) $LiH and A 1_{2} C 1_{6}$ (3) $LiCl, Al and H_{2}$ (4) $LiH and Al (O H)_{3}$ 292. $Which ofthe following statements is incorrect?$ (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) $N a H C O_{3} on heating gives N a_{2} C O_{3} .$ 293. $The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is$ (1) $N H_{3}$ (2) $N_{2}$ (3) $N_{2} O$ (4) $C 1_{2}$ 294. $Which of the following oxides of nitrogen is paramagnetic?$ (1) $N O_{2}$ (2) $N_{2} O_{3}$ (3) $N_{2} O$ (4) $N_{2} O_{5}$ 295. $Which one of the following elemental forms is not present in the enamel of the teeth?$ (1) $C a^{2 +}$ (2) $P^{3 +}$ (3) $F^{-}$ (4) $P^{5 +}$ 296. $Which of the following order is wrong?$ (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) $L i^{+} < N a^{+} < K^{+} < C s^{+} —ionic radius.$ 297. $White phosphorus reacts with thionyl chloride to$ (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) $P C 1_{5}, S 0_{2} and C 1_{2}$ 298. $Which among the following compound does not actas a reducing agent?$ (1) $H_{2} O$ (2) $H_{2} S$ (3) $H_{2} Se$ (4) $H_{2} Te$ 299. $X melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is:$ (1) $Hg$ (2) $ZnS$ (3) $SiC$ (4) $CC l_{4}$ 300. $Which element from following exhibits common oxidation state +2 ?$ (1) $Sr$ (2) $Rb$ (3) $Na$ (4) $Li$