s-Block Elements PYQs Set 18 (PDF)

Set 18 of 20 · Questions 511-540 of 584

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Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 18 (Q511-540)
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511. $The amphoteric hydroxide is:$ (1) $Be (OH)_{2}$ (2) $Ca (OH)_{2}$ (3) $Mg (OH)_{2}$ (4) $Sr (OH)_{2}$ 512. $Incorrectly matched pair is$ (1) $XeF_{4} - tetrahedral$ (2) $XeF_{6} - distorted octahedral$ (3) $XeOF_{4} - square pyramidal$ (4) $XeO_{3} - pyramidal.$ 513. $The s-block element used as a catalyst in the manufacture of Buna- S rubber is$ (1) $Mg$ (2) $Ca$ (3) $Ba$ (4) $Na$ 514. $A colourless neutral, paramagnetic oxide of nitrogen ' P' on oxidation gives reddish brown gas ' Q', ' Q' on cooling gives colourless gas ' R'. ' R' on reaction with ' P' gives blue solid ' S'. Identify P, Q, R and S respectively.$ (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) $NO, NO_{3}, N_{2} O_{4}, N_{2} O_{5}$ 515. $An alkali metal hydride (NaH) reacts with diborane in ' A' to give a tetrahedral compound ' B' which is extensively used as reducing agent in organic synthesis. The compound ' A' and ' B' respectively are$ (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) $C_{6} H_{6} and NaBH_{4}$ 516. $Which of the following reactions does not take place?$ (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) $Cl_{2} + 2 F^{-} ⟶ 2 Cl^{-} + F_{2}$ 517. $MnO_{2} + HCl \to Δ A_{(g)} A_{(g)} + F_{2 (excess)} \to 573 K B_{(g)} B_{(g)} + U_{(s)} ⟶ C_{(g)} + D_{(g)} The gases A, B, C and D are respectively$ (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) $O_{2}, O_{2} F_{2}, U_{2} O_{3}, OF_{2}$ 518. $The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to made teeth enamel harder by converting [3 C a_{3} (P O_{4})_{2} \cdotCa (O H)_{2}] to :$ (1) $[3Ca3(PO4)2\cdotCaF2]$ (2) $[3{Ca(OH)2}\cdotCaF2]$ (3) $[C a F_{2}]$ (4) $[3(CaF2) \cdotCa(OH2]$ 519. $(CH_{3})_{3} SiCl is used duing polymerisation of organosilicons because$ (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) $(CH_{3})_{3} SiCl acts as a catalyst during polymerisation.$ 520. $Choose the correct order of density of the alkali metals :$ (1) $Li<K<Na<Rb<Cs$ (2) $Li<Na<K<Rb<Cs$ (3) $Cs<Rb<K<Na<Li$ (4) $Li<Na<K<Cs<Rb$ 521. $Among the statements (a)-(d), the correct ones are : (A) Lithium has the highest hydration enthalpy among the alkali metals. (B) Lithium chloride is insoluble in pyridine. (C) Lithium cannot form ethynide upon its reaction with ethyne. (D) Both lithium and magnesium react slowly with H_{2} O.$ (1) $(A), (B) and (D) only$ (2) $(B) and (C) only$ (3) $(A) and (D) only$ (4) $(A), (C) and (D) only$ 522. $Match the following compounds with their corresponding physical properties. Column I A. IBr B. ClF_{3} C. BrF_{3} D. ICl_{3} Column II 1. Orange solid 2. Yellow-green liquid 3. Black solid 4. Colourless gas A B C D$ (1) $2 1 4 3$ (2) $1 3 2 4$ (3) $3 4 2 1$ (4) $4 2 1 3$ 523. $The commercial name for calcium oxide is :$ (1) $Quick lime$ (2) $Milk of lime$ (3) $Slaked lime$ (4) $Limestone$ 524. $The correct statement(s) among, I to III with respect to potassium ions that are abundant within the cell fluids is/are: I. They activate many enzymes. II. They participate in the oxidation of glucose to produce ATP III. Along with sodium ions, they are responsible for the transmission of nerve signals$ (1) $I and III only$ (2) $III only$ (3) $I and II only$ (4) $I, II and III$ 525. $Which of the following is not formed when H_{2} S reacts with acidic K_{2} C r_{2} O_{7} solution ?$ (1) $C r S O_{4}$ (2) $C r_{2} (S O_{4})_{3}$ (3) $K_{2} S O_{4}$ (4) $S$ 526. $The reaction between sodium and water can be made less vigorous by$ (1) $lowering the temperature$ (2) $adding a little alcohol$ (3) $amalgamating sodium$ (4) $adding a little acetic acid.$ 527. $Which one of the following compounds is a peroxide?$ (1) $K O_{2}$ (2) $B a O_{2}$ (3) $M n O_{2}$ (4) $N O_{2}$ 528. $The function of Sodium pump” is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?$ (1) $K^{+}$ (2) $F e^{2 +}$ (3) $C a^{2 +}$ (4) $M g^{2 +}$ 529. $Which electrolyte is used in Dennis method for the preparation of fluorine ?$ (1) $K H F_{2} solution in anhydrous HF$ (2) $molten cryolite$ (3) $pure dry molten K H F_{2}$ (4) $none of these$ 530. $The following statements concern elements in the periodic table. Which of the following is true?$ (1) $The Group 13 elements are all metals.$ (2) $All the elements in Group 17 are gases.$ (3) $Elements of Group 16 have lower ionization enthalpy values compared to those of Group 15 in the corresponding periods.$ (4) $For Group 15 elements, the stability of +5 oxidation state increases down the group.$ 531. $Which of the given statements are correct, when carboxyheamoglobin reaches to 3 - 4 % in blood? I. Leads to headache. II. Results in cardiovascular problem. III. Increases the body temperature. IV. Leads to diarrhoea.$ (1) $I and II$ (2) $I and III$ (3) $III and IV$ (4) $II and III$ 532. $Identify a metalloid from the following list of elements.$ (1) $Carbon$ (2) $Neon$ (3) $Sodium$ (4) $Tellurium$ 533. $S-block element which cannot be qualitatively confirmed by the flame test is$ (1) $Li$ (2) $Na$ (3) $Rb$ (4) $Be$ 534. $Oxidation number of potassium in K_{2} O, K_{2} O_{2} and K O_{2}, respectively, is:$ (1) $+1, +2 and +4$ (2) $+1, +4 and +2$ (3) $+1, +1 and +1$ (4) $+2, +1 and + \frac{1}{2}$ 535. $A crystalline solid X reacts with dil. HCl to liberate a gas Y . Y decolourises acidified KMnO_{4} . When a gas Z is slowly passed into an aqueous solution of Y, colloidal sulphur is obtained. X and Z could be, respectively$ (1) $Na_{2} S, SO_{3}$ (2) $Na_{2} SO_{4}, H_{2} S$ (3) $Na_{2} SO_{3}, H_{2} S$ (4) $Na_{2} SO_{4}, SO_{2}$ 536. $One of the by-products formed during the recovery of NH_{3} from Solvay process is :$ (1) $Ca (OH)_{2}$ (2) $NaHCO_{3}$ (3) $CaCl_{2}$ (4) $NH_{4} Cl 0$ 537. $The salt which responds to dilute and concentrated H_{2} SO_{4} is$ (1) $Ba (NO_{3})_{2}$ (2) $Na_{3} PO_{4}$ (3) $CaF_{2}$ (4) $Na_{2} SO_{4}$ 538. $Hydrogen peroxide acts both as an oxidizing and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H_{2} O_{2} acts as a reducing agent in acid medium ?$ (1) $MnO_{4}^{-}$ (2) $C r_{2} O_{7}^{2-}$ (3) $SO_{3}^{2-}$ (4) $KI$ 539. $Identify the pollutant gases largely responsible for the discoloured and Iustreless nature of marble of the Taj Mahal.$ (1) $S O_{2} and N O_{2}$ (2) $S O_{2} and O_{3}$ (3) $O_{3} and C O_{2}$ (4) $C O_{2} and N O_{2}$ 540. $Brown ring test is used for detection of which radical?$ (1) $Ferrous$ (2) $Nitrite$ (3) $Nitrate$ (4) $Ferric$