Periodic Table & Periodicity PYQs Set 8 (PDF)

Set 8 of 11 · Questions 211-240 of 322

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Mere Teacher · Previous Year Questions NEET Chemistry · Periodic Table & Periodicity · Set 8 (Q211-240)
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211. $Which of the following set of properties generally decreases along a period?$ (1) $Ionization energy and atomic radii$ (2) $Metallic character and atomic radii$ (3) $Electron affinity and electronegativity$ (4) $Valency and oxidation potential$ 212. $Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy for oxygen is lower than that of nitrogen. Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion. choose the correct answer from the options given below.$ (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) $A is not correct but R is correct$ 213. $Choose the incorrect trend in the atomic radii (r) of the elements.$ (1) $r_{Rb} < r_{Cs}$ (2) $r_{At} < r_{Cs}$ (3) $r_{Br} < r_{K}$ (4) $r_{Mg} < r_{Al}$ 214. $N a^{+}, M g^{2 +}, A l^{3 +} and S i^{4 +} are isoelectronic. the order of their ionic size is$ (1) $N a^{+} > M g^{2 +} < A l^{3 +} < S i^{4 +}$ (2) $N a^{+} ⟨ M g^{2 +} ⟩ A l^{3 +} > S i^{4 +}$ (3) $N a^{+} > M g^{2 +} > A l^{3 +} > S i^{4 +}$ (4) $N a^{+} ⟨ M g^{2 +} ⟩ A l^{3 +} < S i^{4 +}$ 215. $Which of the following represents the correct order of metallic character of the given elements?$ (1) $Si < Be < Mg < K$ (2) $Be < Si < Mg < K$ (3) $K < Mg < Be < Si$ (4) $Be < Si < K < Mg$ 216. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Metallic character decreases and non-metallic character increases on moving from left toright in a period. Reason (R): It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when onemoves from left to right in a period. choose the most appropriate answer from the options given below:$ (1) $(A) is false but (R) is true.$ (2) $(A) is true but (R) is false.$ (3) $Both (A) and (R) are correct and (R) is the correct explanation of (A).$ (4) $Both (A) and (R) are correct but (R) is not the correct explanation of (A).$ 217. $The ionic radii of K^{+}, N a^{+}, A l^{3 +} and M g^{2 +} are in theorder :$ (1) $N a^{+} < K^{+} < M g^{2 +} < A l^{3 +}$ (2) $A l^{3 +} < M g^{2 +} < K^{+} < N a^{+}$ (3) $A l^{3 +} < M g^{2 +} < N a^{+} < K$ (4) $K^{+} < A l^{3 +} < M g^{2 +} < N a$ 218. $How many of the following statements are correct? (1) ' He' is the second most abundant element in the universe. (2) The symbol for the element with atomic number 110 is Ds. (3) Osmium has the highest density among all elements. (4) Francium is the most electropositive element in the periodic table.$ (1) $3$ (2) $2$ (3) $4$ (4) $1$ 219. $Given below are two statements: Statement (I): An element in the extreme left of the periodic table forms acidic oxides. Statement (II): Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table. choose the correct answer from the options given below :$ (1) $Statement I is true but Statement II is false$ (2) $Both Statement I and Statement II are true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is false but Statement II is true$ 220. $The electronic configuration with the highest ionization enthalpy is:$ (1) $[Ne] 3 s^{2} 3 p^{1}$ (2) $[Ne] 3 s^{2} 3 p^{2}$ (3) $[Ne] 3 s^{2} 3 p^{3}$ (4) $[Ar] 3 d^{10} 4 s^{2} 4 p^{3}$ 221. $"The properties of elements are periodic functions of their atomic weights." This periodic law was given by$ (1) $Dobereiner$ (2) $Lothar Meyer$ (3) $Mendeleev$ (4) $Alexander$ 222. $Elements X and Y belong to Group 15. The difference between the electronegativity values of ' X ' and phosphorus is higher than that of the difference between phosphorus and ' Y^{’} .^{’} X^{’} &^{’} Y^{’} are respectively$ (1) $N & As$ (2) $As & Sb$ (3) $Bi & N$ (4) $As & Bi$ 223. $Which of the following species are isoelectronic species? (i) O^{2 -} (ii) F^{-} (iii) Na^{+} (iv) Mg^{2 +}$ (1) $(i), (ii) and (iii) only$ (2) $(i), (iii) and (iv) only$ (3) $(iii) and (iv) only$ (4) $(i), (ii), (iii) and (iv)$ 224. $For the second period elements the correct increasing order of first ionisation enthalpy is:$ (1) $Li < Be < B < C < N < C < F < Ne$ (2) $Li < B < Be < C < O < N < F < Ne$ (3) $Li < B < Be < C < N < O < F <Ne$ (4) $Li < Be < B < C < O < N < F < Ne$ 225. $The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is$ (1) $Cr > Mn > V > Ti$ (2) $V > Mn > Cr > Ti$ (3) $Mn > Cr > Ti > V$ (4) $Ti > V > Cr > Mn$ 226. $For N a^{+}, M g^{2 +}, F^{-} and O^{2-}; the correct order of increasing ionic radii is:$ (1) $O^{2-} < F^{-} < N a^{+} < M g^{2 +}$ (2) $N a^{+} < M g^{2 +} < F^{-} < O^{2-}$ (3) $M g^{2 +} < N a^{+} < F^{-} < O^{2-}$ (4) $M g^{2 +} < O^{2-} < N a^{+} < F^{-}$ 227. $When a radiation of 300 nm is shined on five metals, namely, LiMg, Ag, Cu and K, the number of metals that show photoelectric effect are$ (1) $2$ (2) $4$ (3) $5$ (4) $3$ 228. $Identify the correct order of the size of the following:$ (1) $C a^{2 +} < K^{+} < A r < C l^{-} < S^{2 -}$ (2) $Ar < C a^{2 +} < K^{+} < C l^{-} < S^{2 -}$ (3) $C a^{2 +} < A r < K^{+} < C l^{-} < S^{2 -}$ (4) $C a^{2 +} < K^{+} < A r < S^{2 -} < C l^{-}$ 229. $Atomic radius (pm) of Al, Si, N and F respectively is$ (1) $117, 143, 64, 74$ (2) $143, 117, 74, 64$ (3) $143, 47, 64, 74$ (4) $64, 74, 117, 143$ 230. $The first ionization energy of magnesium is smaller as compared to that of elements X and Y but higher thanthat of Z. the elements X, Y and Z, respectively, are :$ (1) $chlorine, lithium and sodium$ (2) $argon, lithium and sodium$ (3) $argon, chlorine and sodium$ (4) $neon, sodium and chlorine$ 231. $The set of amphoteric oxides among ZnO, Tl_{2} O_{3}, In_{2} O_{3}, B_{2} O_{3}, PbO, SnO_{2} is$ (1) $ZnO, Tl_{2} O_{3}, PbO$ (2) $ZnO, PbO, SnO_{2}$ (3) $ZnO, In_{2} O_{3}, SnO_{2}$ (4) $ZnO, In_{2} O_{3}, PbO$ 232. $Match the following List-I (Elements) A. Alkali metals B. Alkaline earth metals C. Halogens D. Noble gases List-II (Valence shell Configuration) I. n s^{2} n p^{6} II. n s^{2} n p^{5} III. ns^{2} IV. n s^{1}$ (1) $A-I, B-II, C-III, D-IV$ (2) $A-IV, B-III, C-II, D-I$ (3) $A-II, B-I, C-III, D-IV$ (4) $A-IV, B-I, C-III, D-II$ 233. $Consider the following ionization enthalpies of two elements 'A' and 'B' Which of the following statements is correct? Element Ionization enthalpy (kJ/mol) 1^{s t} 2^{n d} 3^{r d} A 899175714847 B 73714507731$ (1) $Both 'A' and 'B' belong to group-1 where 'B' comes below 'A'.$ (2) $Both 'A' and 'B' belong to group-2 where 'A' comes below 'B'.$ (3) $Both 'A' and 'B' belong to group-2 where 'B' comes below 'A'.$ (4) $Both 'A' and 'B' belong to group-1 where 'A' comes below 'B'.$ 234. $Given below are two statements: Statement (I): The metallic radius of Al is less than that of Ga. Statement (II): The ionic radius of Al^{3 +} is less than that of Ga^{3 +} . In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is correct but Statement II is incorrect$ (2) $Both Statement I and Statement II are correct$ (3) $Statement I is incorrect but Statement II is correct$ (4) $Both Statement I and Statement II are incorrect$ 235. $The first ionization potentials (^{e V}) of Be and B respectively are$ (1) $8.29, 8.29$ (2) $9.32, 9.32$ (3) $8.29, 9.32$ (4) $9.32, 8.29$ 236. $The CORRECT order of first ionisation enthalpy is :$ (1) $Mg < S < Al < P$ (2) $Mg < Al < S < P$ (3) $Al < Mg < S < P$ (4) $Mg < Al < P < S$ 237. $The correct order of the atomic radii of C, Cs, Al, and S is:$ (1) $C < S < Al <Cs$ (2) $S < C < Al < Cs$ (3) $S < C < Cs < Al$ (4) $C < S < Cs < Al$ 238. $The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?$ (1) $Carbon family [Rn] 5 f^{4} 6 d^{10} 7 s^{2} 7 p^{2}$ (2) $Oxygen family [Rn] 5 f^{4} 6 d^{10} 7 s^{2} 7 p^{4}$ (3) $Nitrogen family, [Rn] 5 f^{4} 6 d^{10} 7 s^{2} 7 p^{6}$ (4) $Halogen family, [Rn] 5 f^{4} 6 d^{10} 7 s^{2} 7 p^{5}$ 239. $Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?$ (1) $B C 1_{3} and S F_{6}$ (2) $NO and H_{2} S O_{4}$ (3) $S F_{6} and H_{2} S O_{4}$ (4) $B C 1_{3} and NO$ 240. $Identify the correct order of standard enthalpy of formation of sodium halides.$ (1) $Nal < NaBr < NaF < NaCl$ (2) $Nal < NaBr < NaCl < NaF$ (3) $NaF < NaCl < NaBr < Nal$ (4) $NaCl < NaF < NaBr < Nal$