p-Block Elements PYQs Set 2 (PDF)

Set 2 of 14 · Questions 31-60 of 400

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Mere Teacher · Previous Year Questions NEET Chemistry · p-Block Elements · Set 2 (Q31-60)
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31. $Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Beryllium has less negative value of reduction potential compared to the other alkaline earth metals. Reason R : Beryllium has large hydration energy due to small size of Be but relatively large value of atomization enthalpy. choose the most appropriate answer from the options given below.$ (1) $A is correct but R is not correct$ (2) $Both A and R are correct and R is the correct explanation of A.$ (3) $A is not correct but R is correct$ (4) $Both A and R are correct and R is NOT the correct explanation of A.$ 32. $Among the following, the correct order of acidity is$ (1) $H C l O_{2} < H C l O < H C l O_{3} < H C l O_{4}$ (2) $H C l O_{4} < H C l O_{2} < HClO < H C l O_{3}$ (3) $H C l O_{3} < H C l O_{4} < H C l O_{2} < H C l O$ (4) $HCIO < H C l O_{2} < H C l O_{3} < H C l O_{4}$ 33. $Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture ?$ (1) $The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group.$ (2) $In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group.$ (3) $Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens.$ (4) $In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group.$ 34. $Which of the following statements is true?$ (1) $H3PO3 is a stronger acid than H2SO3$ (2) $In aqueous medium HF is a stronger acid than HCl$ (3) $HCIO4 is a weaker acid than HClO3$ (4) $HNO3 is a stronger acid than HNO2$ 35. $A ' p '-block element (E) and hydrogen form a binary cation (EH_{x})^{+}, while EH_{3} on treatment with K_{2} HgI_{4} in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values (kJmol^{- 1}) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E .$ (1) $1312$ (2) $1402$ (3) $1086$ (4) $801$ 36. $Which of the following represents calcium chlorite?$ (1) $C a (C l O_{3})_{2}$ (2) $C a (C l O_{2})_{2}$ (3) $C a C l O_{2}$ (4) $C a (C l O_{4})_{2}$ 37. $Which of the following property is true for the given sequence NH_{3} > PH_{3} > AsH_{3} > SbH_{3} > BiH_{3} ?$ (1) $Reducing property$ (2) $Thermal stability$ (3) $none of the above$ (4) $Acidic character$ 38. $Identify the wrong statement in the following :$ (1) $Chlorofluorocarbons are responsible for ozone layer depletion$ (2) $Greenhouse effect is responsible for global warming$ (3) $Acid rain is mostly because of oxides of nitrogen and sulphur$ (4) $Ozone layer does not permit infrared radiation from the sun to reach the earth$ 39. $Consider the following reactions Na_{2} B_{4} O_{7} Δ2 X + Y CuSO_{4} + Y Non - Luminous flame Z + SO_{3} 2 Z + 2 X + Carbon Luminous flame 2 Q + Na_{2} B_{4} O_{7} + CO The oxidation states of Cu in Z and Q , respectively are :$ (1) $+1 and +1$ (2) $+2 and +2$ (3) $+1 and +2$ (4) $+2 and +1$ 40. $Which of the following types of forces bind together the carbon atoms in diamond?$ (1) $Ionic$ (2) $Covalent$ (3) $Dipolar$ (4) $van der Waals$ 41. $The Lewis acid character of boron tri halides follows the order:$ (1) $B B r_{3} > B I_{3} > B C I_{3} > B F_{3}$ (2) $B C 1_{3} > B F_{3} > B B r_{3} > B I_{3}$ (3) $B F_{3} > B C 1_{3} > B B r_{3} > B I_{3}$ (4) $B I_{3} > B B r_{3} > B C l_{3} > B F_{3}$ 42. $For a good quality cement, the ratio of silica to alumina is found to be$ (1) $1.5$ (2) $4.5$ (3) $2$ (4) $3$ 43. $In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is$ (1) $hydrogen chloride gas$ (2) $chlorine gas$ (3) $sulphur dioxide gas$ (4) $hydrogen gas.$ 44. $In Ramsay and Rayleigh's isolation of noble gases from air, the nitrogen of the air is finally converted into$ (1) $NaNO_{2} only$ (2) $NO and NO_{2}$ (3) $NaNO_{3} only$ (4) $NaNO_{2} and NaNO_{3}$ 45. $The characteristic not related to alkali metal is$ (1) $their ions are isoelectronic with noble gases$ (2) $low melting point$ (3) $low electronegativity$ (4) $high ionisation energy.$ 46. $The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :$ (1) $H S O_{4}^{-}$ (2) $H O_{3} S O O S O_{3} H$ (3) $H O_{2} S O S O_{2} H$ (4) $H O_{3} S O S O_{3} H$ 47. $The correct statements from the following are: (A) Tl3+ is a powerful oxidising agent(B) Al3+ does not get reduced easily(C) Both Al3+ and Tl3+ are very stable in solution(D) Tl1+ is more stable than Tl3+(E) Al3+ and Tl1+ are highly stable Choose the correct answer from the options given below:$ (1) $(A), (B), (D) and (E) only$ (2) $(A), (C) and (D) only$ (3) $(A), (B), (C) and (E)$ (4) $(B), (D) and (E) only$ 48. $Given below are two statements: one is labelled as Assertion (A): and the other is labelled as Reason (R) Assertion (A): ICl is more reactive than I_{2} . Reason (R): I-Cl bond is weaker than I-I bondchoose the most appropriate answer from the options given below:$ (1) $(A) is not correct but (R) is correct.$ (2) $Both (A) and (R) are correct and (R) is the correct explanation of (A).$ (3) $Both (A) and (R) are correct but (R) is not the correct explanation of (A).$ (4) $(A) is correct but (R) is not correct.$ 49. $Which of the following compound does not exist?$ (1) $N C l_{5}$ (2) $A s F_{5}$ (3) $S b C l_{5}$ (4) $P F_{5}$ 50. $Correct order of 1st ionisation potential among following elements Be, B, C, N, O is$ (1) $B < B e < C < O < N$ (2) $B < B e < C < N < O$ (3) $Be < B < C < N < O$ (4) $Be < B < C < O < N$ 51. $Consider the following reactions. PbCl_{2} + K_{2} CrO_{4} \to A + 2 KCl (Hot solution) A + NaOH ⇌ B + Na_{2} CrO_{4} PbSO_{4} + 4 CH_{3} COONH_{4} \to (NH_{4})_{2} SO_{4} + X In the above reactions, A, B and X are respectively.$ (1) $Na_{2} (Pb (OH)_{2}), PbCrOO_{4} and (NH_{4})_{2} (Pb (CH_{3} COO)_{4})$ (2) $Na_{2} (Pb (OH)_{2}), PbCrO_{4} and (Pb (NH_{3})_{4}) SO_{4}$ (3) $PbCrO_{4}, Na_{2} (Pb (OH)_{4}) and (NH_{4})_{2} (Pb (CH_{3} COO)_{4})$ (4) $PbCrO_{4}, Na_{2} (Pb (OH)_{4}) and (Pb (NH_{3})_{4}) SO_{4}$ 52. $Which of the following statements regarding sulphur is incorrect ?$ (1) $S2 molecule is paramagnetic.$ (2) $The vapour at 200ºC consists mostly of S8 rings.$ (3) $At 600ºC the gas mainly consists of S2 molecules.$ (4) $The oxidation state of sulphur is never less than +4 in its compounds.$ 53. $Which of the following has pπ - dπ bonding ?$ (1) $NO3-$ (2) $SO32-$ (3) $BO33-$ (4) $CO32-$ 54. $Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?$ (1) $Cl$ (2) $Br$ (3) $Al$ (4) $Na$ 55. $Which one of the following oxides is expected to exhibit paramagnetic behaviour ?$ (1) $CO2$ (2) $ClO2$ (3) $SO2$ (4) $SiO2$ 56. $The correct group of halide ions which can be oxidised by oxygen in acidic medium is$ (1) $B r^{-} and I^{-} only$ (2) $B r^{-} only$ (3) $I^{-} only$ (4) $C l^{-}, Br and I^{-} only$ 57. $In which of the following pairs, the two species are isostructural ?$ (1) $BrO3- and XeO3$ (2) $SF4 and XeF4$ (3) $SO32- and NO3-$ (4) $BF3 and NF3$ 58. $The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is :$ (1) $Phosphonic acid$ (2) $Phosphinic acid$ (3) $Pyrophosphorus acid$ (4) $Hypophosphoric acid$ 59. $Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other ?$ (1) $is a reducing agent$ (2) $is soluble in water$ (3) $is used as a food-preservative$ (4) $form 'acid-rain'$ 60. $The correct order of acidic strength is :$ (1) $C l_{2} O_{7} > S O_{2} > P_{4} O_{10}$ (2) $C O_{2} > N_{2} O_{5} > S O_{3}$ (3) $N a_{2} O > MgO > A l_{2} O_{3}$ (4) $K_{2} O > CaO > MgO$