s-Block Elements PYQs Set 9 (PDF)

Set 9 of 20 · Questions 241-270 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 9 (Q241-270)
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241. $The correct order of hydration enthalpies of alkali metal ions is:$ (1) $L i^{+} > N a^{+} > K^{+} > C s^{+} > R b^{+}$ (2) $N a^{+} > L i^{+} > K^{+} > R b^{+} > C s^{+}$ (3) $N a^{+} > L i^{+} > K^{+} > C s^{+} > R b^{+}$ (4) $L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$ 242. $Select wrong chemical reaction among the following:$ (1) $MnO_{2} + 4 HCl ⟶ MnCl_{2} + Cl_{2} + 2 H_{2} O$ (2) $8 NH_{3} + 3 Cl_{2} ⟶ 6 NH_{4} Cl + N_{2}$ (3) $2 NaOH + Cl_{2} ⟶ 2 NaCl + H_{2} + O_{2}$ (4) $2 Ca (OH)_{2} + 2 Cl_{2} ⟶ Ca (OCl)_{2} + CaCl_{2} + 2 H_{2} O$ 243. $Manganese dioxide on heating with concentrated hydrochloric acid gives a greenish yellow gas, X . With excess of ammonia X gives Y and Z . Y and Z respectively are$ (1) $NH_{4} F, N_{2}$ (2) $NH_{4} I, NOCl$ (3) $NCl_{3}, HOCl$ (4) $NH_{4} Cl, N_{2}$ 244. $Choose the correct statement(s): A. Beryllium oxide is purely acidic in nature. B. Beryllium carbonate is kept in the atmosphere of C O_{2} . C. Beryllium sulphate is readily soluble in water. D. Beryllium shows anomalous behavior. Choose the correct answer from the options given below:$ (1) $A, B and C only$ (2) $B, C and D only$ (3) $A and B only$ (4) $A only$ 245. $Relative stability orders of + 1, + 3 oxidation states of Ga, In, T 1 are respectively$ (1) $Tl^{+} > In^{+} > Ga^{+}, Ga^{3 +} > In^{3 +} > Tl^{3 +}$ (2) $Ga^{+} > In^{+} > Tl^{+}, Tl^{3 +} > In^{3 +} > Ga^{3 +}$ (3) $Ga^{+} > In^{+} > Tl^{+}, Ga^{3 +} > In^{3 +} > Tl^{3 +}$ (4) $Tl^{+} > In^{+} > Ga^{+}, Tl^{3 +} > In^{3 +} > Ga^{3 +}$ 246. $Which one among the following metals is the weakest reducing agent ?$ (1) $K$ (2) $Rb$ (3) $Na$ (4) $Li$ 247. $Which of the following tetrahalides does not exist?$ (1) $CCl_{4}$ (2) $SiCl_{4}$ (3) $PbCl_{4}$ (4) $PbI_{4}$ 248. $Identify the correct statements about alkali metals. A. The order of standard reduction potential (M^{+} \|M) for alkali metal ions is Na > Rb > Li. B. CsI is highly soluble in water. C. Lithium carbonate is highly stable to heat. D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic. E. All the alkali metal hydrides are ionic solids. Choose the correct answer from the options given below$ (1) $A, B, D only$ (2) $C and E only$ (3) $A and E only$ (4) $A, B and E only$ 249. $For a good quality cement the ratio of silica to alumina should be in the range of$ (1) $2.5 - 4.0$ (2) $0.1 - 1.0$ (3) $1.0 - 1.5$ (4) $5.0 - 8.0$ 250. $Given below are two statements: Statement I : Both CaCl_{2} \cdot 6 H_{2} O and MgCl_{2} . 8 H_{2} O undergo dehydration on heating. Statement II : BeO is amphoteric whereas the oxides of other elements in the same group areacidic. choose the correct answer from the options given below:$ (1) $Statement I is false but statement II is true$ (2) $Both statement I and statement II are false$ (3) $Both statement I and statement II are true$ (4) $Statement I is true but statement II is false$ 251. $Which of the following reaction represents Deacon's method?$ (1) $2 H_{2} O + 2 C l_{2} Sunlight 4 H C l + O_{2}$ (2) $4 H C l + O_{2} C u C l_{2}, 723 K 2 H_{2} O + C l_{2}$ (3) $2 N a C l + 2 H_{2} O Electrolysis 2 N a O H + H_{2} + C l_{2}$ (4) $Ca (OH)_{2} + Cl_{2} \to CaOCl_{2} \cdot H_{2} O$ 252. $Which gas is evolved when P b O_{2} is treated with concentrated H N O_{3} ?$ (1) $N O_{2}$ (2) $O_{2}$ (3) $N_{2}$ (4) $N_{2} O$ 253. $Which of the following metal ions play an important role in muscle contraction?$ (1) $K^{+}$ (2) $N a^{+}$ (3) $M g^{2 +}$ (4) $C a^{2 +}$ 254. $The metal mainly used in devising photoelectric cells is$ (1) $Na$ (2) $RB$ (3) $Li$ (4) $Cs$ 255. $Match the following List I (alkaline earth metal) A. Be B. Mg C. Ca D. Sr List II (density/ g cm^{- 3}) I. 1.74 II. 1.84 III. 2.63 IV. 1.55$ (1) $A-III, B-II, C-I, D-IV$ (2) $A-IV, B-I, C-II, D-III$ (3) $A-II, B-I, C-III, D-IV$ (4) $A-II, B-I, C-IV, D-III$ 256. $The correct order of Lewis acidic character of boron trihaldes is$ (1) $BF_{3} > BCl_{3} > BI_{3} > BBr_{3}$ (2) $BI_{3} > BBr_{3} > BF_{3} > BCl_{3}$ (3) $BI_{3} > BBr_{3} > BCl_{3} > BF_{3}$ (4) $BF_{3} > BCl_{3} > BBr_{3} > BI_{3}$ 257. $The alkaline earth metal with lowest density is$ (1) $Be$ (2) $Mg$ (3) $Ca$ (4) $Sr$ 258. $Match the following compounds (Column-I) with their uses (Column-II) S.No. I II III IV Column-I Ca (OH)_{2} NaCI CaSO_{4} \cdot \frac{1}{2} H_{2} O CaCO_{3} S.No (A) (B) (C) (D) Column-II casts of statues white wash antacid washing sodapreparation$ (1) $(1)-(B),(\\|)-(C),(\\| I)-(D),()-(A)$ (2) $(1)-(B),(11)-(D),(I I)-(A),(IV)-(C)$ (3) $(1) - (C), (1 I) - (D), (III) - (B), (IV) - (A)$ (4) $(1)-(D),(11)-(A),(I I)-(C),(IV)-(B)$ 259. $The formation of O_{2}^{+} (PtF_{6})^{-} is the basis for the formation of xenon fluorides. This is because$ (1) $O_{2} and Xe have comparable sizes$ (2) $both O_{2} and Xe are gases$ (3) $none of the above$ (4) $O_{2} and Xe have comparable electronegativities.$ 260. $The covalent alkaline earth metal halide (X = Cl, Br, I) is:$ (1) $Mg X_{2}$ (2) $Ca X_{2}$ (3) $Be X_{2}$ (4) $Sr X_{2}$ 261. $In the following reaction a, b, p, q, r and s are a XeF_{4} + bH_{2} O ⟶ pXe + qXeO_{3} + rHF + sO_{2} a b p q r s$ (1) $61042203$ (2) $81452264$ (3) $61242243$ (4) $5 10 3 2 20 3$ 262. $What is the increasing order of hydration enthalpies of alkali metal ions?$ (1) $Rb^{+} < Cs^{+} < K^{+} < Na^{+} < Li^{+}$ (2) $Cs^{+} < Rb^{+} < K^{+} < Li^{+} < Na^{+}$ (3) $Cs^{+} < Rb^{+} < K^{+} < Na^{+} < Li^{+}$ (4) $Cs^{+} < Rb^{+} < Na^{+} < K^{+} < Li^{+}$ 263. $Consider the reaction P_{4} + 3 NaOH + 3 H_{2} O \to Q + 3 NaH_{2} PO_{2} Identify the reaction in which Q is not the product. (Equations are not balanced)$ (1) $Ca_{3} P_{2} + H_{2} O \to$ (2) $H_{3} P O_{3} Δ$ (3) $PH_{4} I + KOH \to$ (4) $PCl_{3} + H_{2} O \to$ 264. $The dioxides and monoxides of elements X and Y are amphoteric in nature. X and Y are respectively.$ (1) $C, Si$ (2) $Si, Ge$ (3) $Sn, Pb$ (4) $Ge, Pb$ 265. $Which element of group 14 decomposes steam to form dioxide and dihydrogen gas?$ (1) $C$ (2) $Pb$ (3) $Ge$ (4) $Sn$ 266. $Helium is used in balloons in place of hydrogen because it is$ (1) $radioactive$ (2) $more abundant than hydrogen$ (3) $incombustible$ (4) $lighter than hydrogen.$ 267. $NaOH Hotexonc . + C l_{2} \to A + other products Ca (OH)_{2} + Cl_{2} \to B + Cold & rdill . other product A & B are respectively$ (1) $NaClO_{3}, Ca (OCl)_{2}$ (2) $NaClO_{3}, Ca (ClO_{3})_{2}$ (3) $NaCl, Ca (ClO_{3})_{2}$ (4) $NaClO, Ca (ClO_{3})_{2}$ 268. $Which of the following products are formed on hydrolysis of NaO_{2} ? (A) NaOH (B) H_{2} O_{2} (C) O_{2} (D) H_{2} O$ (1) $A, D$ (2) $A, C, D$ (3) $A, B, D$ (4) $A, B, C$ 269. $An alkaline earth metal ’ M ’ readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is$ (1) $Ca$ (2) $Mg$ (3) $Sr$ (4) $Be$ 270. $The structures of beryllium chloride in the solid state and vapour phase, respectively, are:$ (1) $chain and chain$ (2) $dimeric and dimeric$ (3) $chain and dimeric$ (4) $dimeric and chain$