s-Block Elements PYQs Set 14 (PDF)

Set 14 of 20 · Questions 391-420 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 14 (Q391-420)
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391. $S + Conc. H_{2} SO_{4} ⟶ X + Y Here X is a gas and Y is a liquid and both are triatomic molecules. The number of electron lone pairs present on the central atoms of X and Y are respectively.$ (1) $2,1$ (2) $1,0$ (3) $1,2$ (4) $2,2$ 392. $Assertion (A): SF6 is highly stable. Reason (R): SF6 is a gas.The correct option among the following is$ (1) $(A) is true, (R) is true and (R) is the correct explanation for (A)$ (2) $(A) is true, (R) is true but (R) is not the correct explanation for (A)$ (3) $(A) is true but (R) is false$ (4) $(A) is false but (R) is true$ 393. $Statement I : Among the oxides of nitrogen, NO and NO_{2} are paramagnetic. Statement II : NO is paramagnetic in the gaseous state and diamagnetic in liquid state. The correct answer is$ (1) $(I) is correct, (II) is not correct$ (2) $Both (I) and (II) are not correct$ (3) $(I) is not correct, (II) is correct$ (4) $Both (I) and (II) are correct$ 394. $Calcium on heating in N_{2} yields an ionic compound A, which reacts with water to give Ca (OH)_{2} and a gas B . Identify A and B$ (1) $CaN_{2}, NO$ (2) $Ca_{3} N_{2}, NH_{3}$ (3) $CaN_{2}, NH_{3}$ (4) $Ca_{3} N_{2}, NO$ 395. $The oxidation state (n) and coordination number (CN) of Al and number of valence electrons around Al (N) in Al_{2} Cl_{6} are respectively$ (1) $3, 3, 6$ (2) $3, 4, 8$ (3) $4, 4, 8$ (4) $3, 4, 6$ 396. $Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1 s^{2} 2 s^{2} 2 p^{3}, the simplest formula for this compound is$ (1) $M g_{2} X_{3}$ (2) $M g X_{2}$ (3) $M g_{2} X$ (4) $M g_{3} X_{2}$ 397. $Which of the compounds among N_{2} O, NO, N_{2} O_{3}, NO_{2}, N_{2} O_{4}, N_{2} O_{5} are diamagnetic?$ (1) $NO, NO_{2}, N_{2} O_{3}$ (2) $N_{2} O, N_{2} O_{3}, N_{2} O_{4}, N_{2} O_{5}$ (3) $NO, NO_{2}$ (4) $N_{2} O_{4}, N_{2} O_{5}$ 398. $Which of the following oxoacids of sulphur has -O-O- linkage ?$ (1) $H_{2} S_{2} O_{3}$ (2) $H_{2} S_{2} O_{5}$ (3) $H_{2} S_{2} O_{6}$ (4) $H_{2} S_{2} O_{8}$ 399. $Lithium nitrate and sodium nitrate, when heated separately, respectively, give :$ (1) $L i N O_{2} and N a N O_{2}$ (2) $L i_{2} O and N a_{2} O$ (3) $L i_{2} O and N a N O_{2}$ (4) $L i N O_{2} and N a_{2} O$ 400. $Commercial name of peroxydisulphuric acid is$ (1) $Marshall's acid$ (2) $Caro's acid$ (3) $oleum$ (4) $fuming sulphuric acid$ 401. $The strong reducing property of hypophosphorous acid is due to$ (1) $two P - H bonds$ (2) $presence of phosphorus in its highest oxidation state$ (3) $its concentration$ (4) $the positive valency of phosphorus.$ 402. $The correct order of the mobility of the alkali metal ions in aqueous solution is$ (1) $R b^{+} > K^{+} > N a^{+} > L i^{+}$ (2) $L i^{+} > N a^{+} > K^{+} > R b^{+}$ (3) $N a^{+} > K^{+} > R b^{+} > L i^{+}$ (4) $K^{+} > R b^{+} > N a^{+} > L i^{+}$ 403. $Unknown inorganic compound ' A' is used for water softening ' A' reacts with Na_{2} CO_{3} to generate an alkaline compound 'B' whose pH = 14 . 'A' on reaction with CO_{2} gives cloudy ppt. 'B' + CaO reacts with unknown organic compound ' C' to give C_{6} H_{6} . A, B and C, respectively, are$ (1) $Ca (OH)_{2}, Na_{2} CO_{3}, C_{6} H_{5} COOH$ (2) $Ca (OH)_{2}, NaOH, C_{6} H_{5} CH_{2} COOH$ (3) $Ca (OH)_{2}, NaOH, C_{6} H_{5} COOH$ (4) $Ca, NaOH, C_{6} H_{5} COOH$ 404. $In the extraction of copper from copper glance, blister copper is formed by the evolution of gas X . The shape of molecule of X is$ (1) $Angular$ (2) $Planar trigonal$ (3) $Tetrahedral$ (4) $Pyramidal$ 405. $The oxidation states of sulphur atoms and number of S-OH bonds in Peroxydisulfuric acid are respectively.$ (1) $(+ 6, + 5), 2$ (2) $(+ 6, + 6), 4$ (3) $(+ 6, + 6), 2$ (4) $(+ 5, + 5), 4$ 406. $When SbF_{5} reacts with XeF_{4} to form an adduct, the shapes of cation and anion in the adduct respectively are$ (1) $square planar, trigonal bipyramidal$ (2) $T-shaped, octahedral$ (3) $square pyramidal, octahedral$ (4) $plane triangular, trigonal bipyramidal$ 407. $The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B . Excess of C O_{2} is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A . The compound is$ (1) $C a C O_{3}$ (2) $N a_{2} C O_{3}$ (3) $K_{2} C O_{3}$ (4) $C a S O_{4} \cdot 2 H_{2} O$ 408. $In solid state, PC l_{5} is a/an$ (1) $octahedral structure$ (2) $ionic solid with PC l_{6}^{+} and PC l_{4}^{-}$ (3) $ionic solid with PC l_{4}^{+} and PC l_{6}^{-}$ (4) $covalent solid present in the form of P_{2} C l_{10} .$ 409. $AlCl_{3} in water at pH < 7 forms$ (1) $tetrahedral Al (OH)_{4}^{-} ions$ (2) $octahedral Al (OH)_{6}^{3 -} ions$ (3) $square planar Al (OH)_{4}^{-} ions$ (4) $octahedral [Al (O H_{2})_{6}]^{3 +} ions$ 410. $Predict the feasibility of the given reactions in aqueous solution (i) Be (OH)_{2} + 2O H^{-} \to [Be (OH)_{4}]^{2 -} (ii) Be (OH)_{2} + 2 H^{+} + 2 H_{2} O \to [Be (H_{2} O)_{4}]^{2 +}$ (1) $Only (i) is feasible$ (2) $Only (ii) is feasible$ (3) $(i) and (ii) are feasible$ (4) $(i) and (ii) are not feasible$ 411. $The correct order of hydration enthalpies is (A) K^{+} (B) R b^{+} (C) M g^{2 +} (D) C s^{+} (E) C a^{2 +} Choose the correct answer from the options given below:$ (1) $C>A>E>B>D$ (2) $E>C>A>B>D$ (3) $C>E>A>D>B$ (4) $C>E>A>B>D$ 412. $Identify the correct pairs in which the chemical substance given is correctly matched with its use Chemical Substance Use (A) C l_{2} Preparation of phosgene (B) I_{2} O_{5} estimation of CO (C) O_{3} disinfectant$ (1) $A, B, C$ (2) $A, B only$ (3) $B, C only$ (4) $A, C only$ 413. $In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?$ (1) $P b S + 4 H_{2} O_{2} \to P b S O_{4} + 4 H_{2} O$ (2) $2 M n O_{4}^{-} + 3 H_{2} O_{2} \to 2 M n O_{2} + 3 O_{2} + 2 H_{2} O + 2 O H^{-}$ (3) $I_{2} + H_{2} O_{2} + 2 O H^{-} \to 2 I^{-} + 2 H_{2} O + O_{2}$ (4) $H O C l + H_{2} O_{2} \to H_{3} O^{+} + C l^{-} + O_{2}$ 414. $Hydration enthalpy of which of the following ions is highest?$ (1) $Mg^{2 +}$ (2) $N a^{+}$ 415. $The statement that is not correct is$ (1) $hypophosphorous acid reduces silver nitrate to silver$ (2) $in solid state PCl_{5} exists as (PCl_{4})^{+} (PCl_{6})^{-}$ (3) $pure phosphine is non-inflammable$ (4) $phosphorous acid on heating disproportionates to give metaphosphoric acid and phosphine.$ 416. $The correct order of density is$ (1) $Be > Mg > Ca > Sr$ (2) $Sr > Ca > Mg > Be$ (3) $Sr > Be > Mg > Ca$ (4) $Be > Sr > Mg > Ca$ 417. $When a substance (a) reacts with water it produces a combustible gas (b) and a solution of substance (c) in water. When another substance (d) reacts with this solution of (c), it also produces the same gas (b) on warming but (d) can produce gas (b) on reaction with dilute sulphuric acid at room temperature. Substance (a) imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. hen (^{A})^{,} (^{B})^{,} (c) and (d) respectively are$ (1) $Ca, H_{2}, Ca(OH), Sn$ (2) $K, H_{2}, KOH, Al$ (3) $Na, H_{2}, NaOH, Zn$ (4) $C a C_{2}, CH, Ca(OH), Fe$ 418. $The acidic oxide from the following is$ (1) $SnO_{2}$ (2) $SiO_{2}$ (3) $PbO_{2}$ (4) $SnO$ 419. $Very pure N_{2} can be obtained by$ (1) $thermal decomposition of ammonium dichromate$ (2) $treating aqueous solution of NH_{4} Cl and NaNO_{2}$ (3) $liquefaction and fractional distillation of liquid air$ (4) $thermal decomposition of sodium azide.$ 420. $Strongest bond is in between$ (1) $C s F$ (2) $N a C$ (3) $both (a) and (b)$ (4) $none of the above.$