s-Block Elements PYQs Set 11 (PDF)

Set 11 of 20 · Questions 301-330 of 584

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions JEE Main Chemistry · s-Block Elements · Set 11 (Q301-330)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
301. $Which among the following is least covalent in nature?$ (1) $NF_{3}$ (2) $BiF_{3}$ (3) $PF_{3}$ (4) $SbF_{3}$ 302. $Formic acid is heated with conc. H_{2} SO_{4} at 100^{\circ} C to form A and B . When Fe_{2} O_{3} is heated strongly with B, the products formed are C and D . C can also be obtained by reacting CaCO_{3} with dil. HCl . What is D ?$ (1) $F e$ (2) $CO$ (3) $CO_{2}$ (4) $Fe_{3} O_{4}$ 303. $The complex formed when Al_{2} O_{3} is leached from bauxite using concentrated NaOH solution is$ (1) $Na (Al (OH)_{4})$ (2) $NaAl_{2} O_{4}$ (3) $Na_{2} (Al (OH)_{3})$ (4) $Na_{2} AlO_{2}$ 304. $Compared with the alkaline earth metals, the alkali metals exhibit$ (1) $smaller ionic radii$ (2) $highest boiling points$ (3) $greater hardness$ (4) $lower ionization energies.$ 305. $Which of the following compounds has the lowest melting point?$ (1) $C a C l_{2}$ (2) $C a B r_{2}$ (3) $C a I_{2}$ (4) $C a F_{2}$ 306. $When helium gas is allowed to expand into vacuum, heating effect is observed. The reason for this is (assume He as a non ideal gas)$ (1) $He is an inert gas$ (2) $The inversion temperature of helium is very high$ (3) $The inversion temperature of helium is very low$ (4) $He has the lowest boiling point.$ 307. $Choose the correct statement from the following :$ (1) $The standard enthalpy of formation for alkali metal bromides becomes less negative on descending thegroup.$ (2) $The low solubility of CsI CsI in water is due to its high lattice enthalpy.$ (3) $Among the alkali metal halides,LiF is least soluble in water.$ (4) $LiFhas least negative standard enthalpy of formation among alkali metal fluorides.$ 308. $The number of lone pair of electrons present in the valence shell of Xenon (z = 54) in XeOF_{4}, XeF_{4}, XeF_{2} and XeF_{6} are respectively$ (1) $1, 2, 3, 1$ (2) $2, 1, 2, 2$ (3) $3, 1, 2, 1$ (4) $1, 3, 2, 0$ 309. $Identify the correct statements about the anomalous behavior of Boron I. Boron trihalides can form dimeric structures. II. Boron shows +1 as stable oxidation state III. Maximum covalency of boron is four. IV. Boron does not form BF_{6}^{6 -} ion.$ (1) $I, II only$ (2) $II, III only$ (3) $III, IV only$ (4) $I, IV only$ 310. $Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?$ (1) $C a S O_{4}$ (2) $B e S O_{4}$ (3) $B a S O_{4}$ (4) $S r S O_{4}$ 311. $0.1mole of XeF_{6} is treated with 1.8 g of water. The product obtained is$ (1) $XeO_{3}$ (2) $XeOF_{4}$ (3) $XeO_{2} F_{2}$ (4) $Xe + XeO_{3}$ 312. $The percentage of p -character of the hybrid orbitals in graphite and diamond are respectively ;$ (1) $33 and 25$ (2) $50 and 75$ (3) $67 and 75$ (4) $33 and 75$ 313. $The correct sequence of increasing covalent character is represented by$ (1) $L i C l < N a C l < B e C l_{2}$ (2) $B e C l_{2} < LiCl < NaCl$ (3) $N a C l < L i C l < B e C l_{2}$ (4) $B e C l_{2} < NaCl < LiCl$ 314. $The suspension of slaked lime in water is known as$ (1) $lime water$ (2) $quick lime$ (3) $milk of lime$ (4) $aqueous solution of slaked lime.$ 315. $Which gas/gases evolve(s) when sodium metal is reacted with water at room temperature?$ (1) $Oxygen only$ (2) $Hydrogen only$ (3) $Sodium vapour and hydrogen$ (4) $Hydrogen and water vapour$ 316. $What is X in the following reaction? NaH + B_{2} H_{6} \to diethyl ether X$ (1) $Na (BH_{4})$ (2) $NaBO_{2}$ (3) $H_{3} BO_{3}$ (4) $(C_{2} H_{5} OC_{2} H_{4})^{+} (BH_{4})^{-}$ 317. $A metal M readily forms water soluble sulphate M S O_{4}, water insoluble hydroxide M (O H)_{2} and oxide MO which becomes inert on heating. The hydroxide is soluble in NaOH. The M is :$ (1) $Be$ (2) $Mg$ (3) $Ca$ (4) $Sr$ 318. $The solubilities of carbonates decrease down the magnesium group due to a decrease in$ (1) $hydration energies of cations$ (2) $inter ionic interaction$ (3) $entropy of solution formation$ (4) $lattice energies of solids.$ 319. $Which of the following is the most basic oxide?$ (1) $SO_{3}$ (2) $SeO_{3}$ (3) $PoO$ (4) $TeO$ 320. $On passing electric current over molten ionic hydrides of s -block elements,$ (1) $H_{2} is liberated at the anode$ (2) $H_{2} is liberated at the cathode$ (3) $No reaction takes place$ (4) $Metal oxidises at the cathode$ 321. $Order of Covalent bond; A. KF > KI; LiF > KF B. KF<KI; LiF>KF C. SnCl_{4} > SnCl_{2}; CuCl > NaCl D. LiF>KF; CuCl, NaCl E. KF < KI; CuCl > NaCl$ (1) $C, E only$ (2) $B, C only$ (3) $B, C, E only$ (4) $A, B only$ 322. $Identify the correct statements from the following (I) Au is soluble in aqua regia but not Pt (II) Among the oxoacids of chlorine highest oxidation state possible for chlorine is +7 (III) Among the hydrogen halides lowest boiling point is for HCl (IV) The order of stability of oxides of halogens is Cl > Br > I$ (1) $I & II only$ (2) $II & III only$ (3) $I & IV only$ (4) $II & IV only$ 323. $Which of the following fluorides of Xenon does not exist?$ (1) $XeF_{3}$ (2) $XeF_{2}$ (3) $XeF_{6}$ (4) $XeF_{4}$ 324. $Which of the following alloys are correctly matched with their uses? (i) Li / Mg armour plates (ii) Cu / Be high strength springs (iii) Mg / Al aircraft construction$ (1) $i, ii only$ (2) $ii, iii only$ (3) $i, iii only$ (4) $i, ii, iii$ 325. $Which of the following compounds on heating gives N_{2} O ?$ (1) $Pb (NO_{3})_{2}$ (2) $NH_{4} NO_{3}$ (3) $NH_{4} NO_{2}$ (4) $NaNO_{3}$ 326. $The metal nitrate that liberates NO_{2} on heating$ (1) $NaNO_{3}$ (2) $LiNO_{3}$ (3) $KNO_{3}$ (4) $RbNO_{3}$ 327. $Borax dissolves in water and forms a product of boron (X). Identify the compound X .$ (1) $HBO_{2}$ (2) $B_{2} O_{3}$ (3) $NaBO_{2}$ (4) $H_{3} BO_{3}$ 328. $Identify the correct statements from the following: A. Alkali metals are strong reducing agents. B. KO_{2} is a diamagnetic oxide. C. Lithium chloride exists as LiCl . 2 H_{2} O$ (1) $A, B only$ (2) $A, C only$ (3) $B, C only$ (4) $A, B, C$ 329. $The key step in the manufacturing of H_{2} SO_{4} by contact process is$ (1) $absorption of SO_{3} in H_{2} SO_{4} to give oleum$ (2) $dilution of oleum with water$ (3) $burning of sulphur in air to generate SO_{2}$ (4) $catalytic oxidation of SO_{2} with O_{2} to give SO_{3}$ 330. $Hydrogen peroxide oxidises [Fe(CN)_{6}]^{4-} to [Fe(CN)_{6}]^{3-} in acidic medium but reduces [Fe(CN)_{6}]^{3-} to [Fe(CN)_{6}]^{4-} in alkaline medium. The other products formed are, respectively$ (1) $H_{2} O and (H_{2} O + O_{2})$ (2) $H_{2} O and (H_{2} O + O H^{-})$ (3) $(H_{2} O + O_{2}) and H_{2} O$ (4) $(H_{2} O + O_{2}) and (H_{2} O+ O H^{-})$