Title 07. THE P-BLOCK ELEMENTS.pdf ✅

PAPER 1 (1.) Correct statement will be : a. Electron gain enthalpy of oxygen will be most negative in their group. b. N O2 will be example of sub-oxide c. In the see-saw gemetory of SF4 , lone pair occupies equatorial position d. On partial hydrolysis of 1 mole of Marshells acid, 1 mole of H O2 2 will obtained. (1) a and b only (2) a, b and c only (3) b and c only (4) a, c and d only (2.) Select the incorrect statement about the following: (1) O3 is used as germicide for purification of water (2) In O ,O O 3 − bond length is greater than that of molecular oxygen (3) O3 molecule is angular in shape (4) None of these (3.) The oxo-acid of S having S O O H −−− bond : (1) H S O 2 2 7 (2) H S O 2 2 8 (3) H SO2 5 (4) Both 2 and 3 (4.) When PCl5 reacts with H SO2 4 , sulphuryl chloride (SO Cl 2 2 ) is formed. This shows that sulphuric acid: (1) has great affinity for water (2) has two hydroxyl groups in its structure (3) is a derivative of SO2 (4) None of the above (5.) The number of  -bond and basicity in thiosulphuric acid are respectively : (1) 2 and 2 (2) 2 and 1 (3) 1 and 2 (4) 4 and 2 (6.) In trimeric structure of SO3 the number and type of  -bond present : (1) 6 bond (3 3 p p p d     − + − ) (2) 12 bond (6 6 p p p d     − + − ) (3) 6 bond (6 0 p p p d     − + − ) (4) 6 bond (0 6 p p p d     − + − ) (7.) Which of the following is true for interhalogen compound: (1) ICl is more reactive than 2 I position (2) In BrF3 molecule the lone pair occupies equatorial position (3) Among interhalogen compounds maximum number of atoms are present in iodine fluoride. (4) All of these (8.) Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power :
Ion 4 4 4 Θ ClO IO BrO Reduction E 1.19 E 1.65 V E 1.74 V potential / V − − − = = = I E on V (1) ClO IO BrO 4 4 4 − − −   (2) 4 4 4 IO BrO ClO − − −   (3) BrO IO ClO 4 4 4 − − −   (4) BrO ClO IO 4 4 4 − − −   (9.) One gas bleaches the colour of flowers by reduction and another gas by oxidation. The gases respectively, are : (1) SO2 and Cl2 (2) O3 and Cl2 (3) Cl2 and SO2 (4) None of these (10.) Select the incorrect order for the given : a) ClO ClO ClO 2 3 4 −−−   − Bond angle b) ClO ClO ClO ClO 2 3 4 −−−−    − Stability in aqu. medium c) ClO ClO ClO 2 4 −−−   − Increasing oxidation no. d) HClO HClO HClO HClO    234 - Oxidising power (1) a and d (2) a, b and d (3) b and d (4) Only d (11.) In the hydrolysis reaction of 3 ICl , the hybridisation and oxidation state of central element in oxoanion will be : (1) 3 sp d and -1 (2) 3 sp and +3 (3) 3 sp and -1 (4) 2 sp and +1 (12.) Which of the following statements is/are correct for SO2 gas : a) It acts as dry bleacher b) In the formation of SO , S 2 , utelises its 2nd excited state c )It has one p d   − and one p p   − along with two  -bond d )It act as mixed anhydride (1) a, b, and d (2) a, c and d (3) c and d only (4) Only c (13.) Commericial source of helium is : (1) Natural gases (2) Air (3) Radio active minerals (4) None of these (14.) Which amongst the following halides is stable : (1) SF6 (2) SCl6 (3) SBr6 (4) all of these (15.) Concentrated nitric acid reacts with iodine to give. (1) HOI (2) HI (3) HOIO2 (4) HOIO3 (16.) Which of the following order is not correct : (1) Cl Br I 3 3 3 − − −   Stability
(2) HCl HBr HI HF    Vapour pressure (3) HClO HClO HClO HClO 432    oxidising power (4) ClO Cl O H O 2 2 2   Bond angle (17.) Which fluoride is isostructural with 2 ICl− : (1) XeF4 (2) XeF6 (3) XeF2 (4) 2 XeF8 − (18.) XeF4 act as fluoride acceptor with: (1) PF5 (2) SbF5 (3) KF (4) All of these (19.) The number of S O S − − bond in SO3 in solid state : (1) three (2) four (3) one (4) zero (20.) Group 16 element have lower value of first ionisation enthalpy as compared to group 15 element because : (1) half filled p-orbital in group 15 element are more stable. (2) group 16 element have smaller size than group 15 elements (3) group 16 elements contain double bond while group 15 element have triple bond (4) group 16 element have more number of electrons in p-orbital. (21.) Choose the incorrect statement regarding group th 16 : (1) All the hydrides except water possess reducing property (2) The acidic character increases from H O2 to H Te 2 (3) SF6 is exceptionally stable for steric reasons (4) H S2 is more acidic than H Te 2 (22.) The incorrect statement regarding tetrahalide of group th 16 is : (1) SF4 is a gas and SeF4 is a liquid (2) These fluorides have 3 sp d hybridisation (3) TeF4 is a solid (4) Geometry of halide is "see saw" and also one lone pair is present at the axial position. (23.) Which of the following formula represent fuming sulphuric acid (oleum) : (1) H S O 2 2 4 (2) H SO2 5 (3) H S O 2 2 7 (4) H S O 2 2 8 (24.) Dioxygen directly reaction nearly all metal and non metal except : (1) Au, Pt only (2) Au, Pt and some noble gases (3) Zn, Pt (4) All of these
(25.) High concentration of ozone can be dangerously explosive because : (1) Ozone is thermodynamically unstable (2) Formation of oxygen from ozone is exothermic reaction (3) Gibbs energy change for conversion of ozone into oxygen is large negative (4) All (26.) Which of the following bonds has the highest energy : (1) Se Se − (2) Te Te − (3) S - S (4) O O− (27.) Among H O,H S,H Se 2 2 2 and H2 Te the one with highest boiling point is : (1) H O2 because of hydrogen bonding (2) H2 Te because of higher molecular weight (3) H S2 because of higher molecular weight (4) H2 Se because of lower molecular weight (28.) Bond angle is minimum in : (1) H O2 (2) H S2 (3) H Se 2 (4) H Te 2 (29.) Which among the following option is correct for acidic nature of oxide : (1) TeO SeO SO 3 3 3   (2) TeO SeO SO 2 2 2   (3) TeO SeO SO 2 2 3   (4) SO TeO SeO 3 2 2   (30.) Which of the following has greatest reducing power (1) HI (2) HBr (3) HCl (4) HF (31.) Bromine is obtained on commercial scale from (1) Caliche (2) Carnellite (3) Common salt (4) Cryolite (32.) Which one of the halogen acids is a liquid (1) HF (2) HCl (3) HBr (4) HI (33.) Which one of the following acids is the weakest (1) HClO (2) HBr (3) HClO3 (4) HCl (34.) The noble gas which forms maximum number of compounds is (1) Ar (2) He (3) Xe (4) Ne (35.) Nuclear fusion produces (1) Argon (2) Deuterium (3) Helium (4) Krypton (36.) Among the fluorides below, the one which does not exist is