Tiêu đề DPP-3 SOLUTION.pdf ✅

CLASS : XIth SUBJECT : CHEMISTRY DATE : DPP No. : 3 1 (d) The first ionisation energy of xenon is quite close to that of oxygen and the molecular diameter of xenon and oxygen are almost identical. Based on the above facts it is suggested that since oxygen combines with PtF6, so xenon should also form similar compounds with PtF6. 2 (d) The bond pair gets farther apart from central atom due to increasing bond length and thus, lone pair on central atom causes more contraction in bond angles. 3 (d) CO is neutral. 4 (d) Ca3 (PO4 )2 + 3SiO2⟶3CaSiO3 + P2O5 2P2O5 +10C⟶P4 +10CO 5 (b) NO2 is a brown coloured gas 6 (c) KI + I2→KI3 7 (d) SO2, H2O ans O3 all of these act as bleaching agent. 8 (a) Allotropes have different crystalline nature. 9 (a) P exists as P4, Sb exists as Sb4. 10 (a) He was detected first in solar atmosphere. 11 (b) The electrolyte used in battery is 38% H2SO4. 12 (b) Cl2 is used in preparation of DDT-an insecticide. 13 (a) Topic :-THE P-BLOCK ELEMENTS-2 Solutions
Due to H-bonding, HF exists in dimeric (H2F2) liquid state. 14 (b) Halon-1301 is CF3Br. The first figure 1 represents no. of C atoms, the second figure represents no. of F atoms, the third figure 0 represents the no. of Cl atoms and last figure 1 represents the Br atom 15 (a) It is a test for proteins. 16 (a) Both XeF2 and IF ― 2 are linear species but the central atoms Xe and I undergo sp 3d hybridisation with all the three equatorial positions occupied by lone pairs of electrons 17 (d) Haber process —NH3, birkeland –eyde process —HNO3, solvay process — Na2CO3. 18 (d) In rest all molecules the central non-metal atom possesses lone pair of electron which gives rise to distorted geometry. 19 (d) 2KClO3 + I2⟶2KIO3 + Cl2 20 (b) In VIA gp, sulphur possesses the maximum tendency for catenation. The catenation order : C > Si ≈ S > P > N > O
ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. D D D D B C D A A C Q. 11 12 13 14 15 16 17 18 19 20 A. B B A B A A D D D B