p-Block Elements PYQs Set 5 (PDF)

Set 5 of 14 · Questions 121-150 of 400

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Mere Teacher · Previous Year Questions NEET Chemistry · p-Block Elements · Set 5 (Q121-150)
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121. $Method used for obtaining highly pure silicon, used as a semiconductor material, is$ (1) $crystallization$ (2) $zone refining$ (3) $oxidation$ (4) $electrochemical.$ 122. $Which of the following sets has strongest tendency to form anions?$ (1) $Ga, Ni, Tl$ (2) $Na, Mg, Al$ (3) $N, O, F$ (4) $V, Cr, Mn.$ 123. $Consider the following elements In, Tl, Al, Pb, Sn and Ge . The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are$ (1) $+4 and +1$ (2) $+1 and +4$ (3) $+4 and +3$ (4) $+2 and +3$ 124. $Number of electrons shared in the formation of nitrogen molecule is$ (1) $6$ (2) $10$ (3) $2$ (4) $8$ 125. $The number of pentagons in C_{60} and trigons (triangles) inwhite phosphorous, respectively, are:$ (1) $20 and 3$ (2) $12 and 4$ (3) $12 and 3$ (4) $20 and 4$ 126. $Which of the following has the greatest electron affinity?$ (1) $I$ (2) $Br$ (3) $F$ (4) $Cl$ 127. $Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides ?$ (1) $A l_{2} O_{3} < MgO < N a_{2} O < K_{2} O$ (2) $MgO < K_{2} O < A l_{2} O_{3} < N a_{2} O$ (3) $N a_{2} O < K_{2} O < MgO < A l_{2} O_{3}$ (4) $K_{2} O < N a_{2} O < A l_{2} O_{3} < MgO$ 128. $It is because of inability of n s^{2} electrons of the valence shell to participate in bonding that$ (1) $S n^{2 +} is oxidising while P b^{4 +} is reducing$ (2) $S n^{2 +} and P b^{2 +} are both oxidising and reducing$ (3) $S n^{4 +} is reducing while P b^{4 +} is oxidising$ (4) $S n^{2 +} is reducing while P b^{4 +} is oxidising.$ 129. $Dinitrogen is a robust compound, but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is .$ (1) $NO$ (2) $N O_{3}^{-}$ (3) $N O_{2}$ (4) $N O_{2}^{-}$ 130. $Which from following molecules exhibits highest acidic nature?$ (1) $H_{2} O$ (2) $H_{2} S$ (3) $H_{2} Se$ (4) $H_{2} Te$ 131. $HF has highest boiling point among hydrogen halides, because it has:$ (1) $strongest van der Waals' interactions$ (2) $lowest ionic character$ (3) $strongest hydrogen bonding$ (4) $lowest dissociation enthalpy$ 132. $Which of the following statements is not true for halogens?$ (1) $All form monobasic oxyacids.$ (2) $All are oxidizing agents.$ (3) $All but fluorine show positive oxidation states.$ (4) $Chlorine has the highest electron‐gain enthalpy$ 133. $Given below are two statements : Statement I :Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame. choose the most appropriate answer from the optionsgiven below.$ (1) $Statement I is false but statement II is true.$ (2) $Statement is true but Statement II is false.$ (3) $Both Statement I and Statement II are true.$ (4) $Both Statement I and Statement II are false.$ 134. $In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?$ (1) $B C l_{3}$ (2) $B F_{3}$ (3) $B B r_{3}$ (4) $B I_{3}$ 135. $Boron compounds behave as Lewis acids, because of them$ (1) $ionisation property$ (2) $electron deficient nature$ (3) $acidic nature$ (4) $covalent nature.$ 136. $The ion that has s p^{3} d^{2} hydridization for the central atom, is:$ (1) $I C l_{4}^{-}$ (2) $(ICl_{2})^{-}$ (3) $I F_{6}^{-}$ (4) $(BrF_{2})^{-}$ 137. $Given below are two statements: Statement I: The boiling points of the following hydrides of group 16 elements increases in the order: H_{2} O < H_{2} S < H_{2} Se < H_{2} Te . Statement II: The boiling points of these hydrides increase with increase in molar mass. choose the most appropriate answer from the options given below:$ (1) $Statements I is incorrect but Statements II is correct.$ (2) $Both Statements I and Statements II are correct$ (3) $Both Statements I and Statements II are incorrect$ (4) $Statements I is correct but Statements II is incorrect$ 138. $The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of$ (1) $Atomicity$ (2) $Electron gain enthalpy$ (3) $Electronegativity$ (4) $Atomic size$ 139. $White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of C O_{2} gives phosphine and compound (X) . (X) on acidification with HCl gives compound (Y) . The basicity of compound (Y) is :$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 140. $The nature of oxide (TeO_{2}) and hydride (TeH_{2}) formed by Te, respectively are:$ (1) $Reducing and basic$ (2) $Reducing and acidic$ (3) $Oxidizing and acidic$ (4) $Oxidizing and basic$ 141. $Which among the following is the most reactive ?$ (1) $Cl2$ (2) $Br2$ (3) $Ι2$ (4) $ΙCl$ 142. $The correct order of thermal stability of hydroxides is :$ (1) $Ba (O H)_{2} < Ca (O H)_{2} < Sr (O H)_{2} < Mg (O H)_{2}$ (2) $Ba (O H)_{2} < Sr (O H)_{2} < Ca (O H)_{2} < Mg (O H)_{2}$ (3) $Mg (O H)_{2} < Ca (O H)_{2} < Sr (O H)_{2} < Ba (O H)_{2}$ (4) $Mg (O H)_{2} < Sr (O H)_{2} < Ca (O H)_{2} < Ba (O H)_{2}$ 143. $Bleaching powder reacts with a few drops of conc. HC1 to give$ (1) $chlorine$ (2) $hypochlorous acid$ (3) $calcium oxide$ (4) $oxygen.$ 144. $The corrects statement with respect to dinitrogen is:$ (1) $N_{2} is paramagnetic in nature$ (2) $it can be used as an inert diluent for reactive chemicals$ (3) $it can be combine with dioxygen at 25°C$ (4) $liquid dinitrogen is not used in cryosurgery$ 145. $The chloride that CAN NOT get hydrolysed is:$ (1) $PbCl_{4}$ (2) $CCl_{4}$ (3) $SnCl_{4}$ (4) $SiCl_{4}$ 146. $Which of the following oxides is the most acidic ?$ (1) $N2O5$ (2) $P2O5$ (3) $As2O5$ (4) $Sb2O5$ 147. $The correct statements from the following are :(A) Ionic radii of trivalent cations of group 13 elements decreases down the group.(B) Electronegativity of group 13 elements decreases down the group.(C) Among the group 13 elements, Boron has highest first ionisation enthalpy.(D) The trichloride and triiodide of group 13 elements are covalent in nature. Choose the correct answer from the options given below:$ (1) $(C) and (D) Only$ (2) $(A) and (D) Only$ (3) $(A) and (C) Only$ (4) $(B) and (D) Only$ 148. $The one that is extensively used as a piezoelectric material is:$ (1) $tridymite$ (2) $amorphous silica$ (3) $quartz$ (4) $mica$ 149. $The element which forms oxides in all oxidation states +I to +V is :$ (1) $N$ (2) $P$ (3) $As$ (4) $Sb$ 150. $Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?$ (1) $White phosphorus$ (2) $Yellow phosphorus$ (3) $β-Black phosphorus$ (4) $α -Black phosphorus$