Question

15. Select the correct statement a) a double bond consists of two pi bonds c) a single bond consists of one sigma bond b) a triple bond consists of three pi bonds all statements are correct d) Which of these properties is/are characteristics(s) of gases? a) High compressibility b) Relatively large distances between molecules Formation of homogeneous mixtures regardless of the nature of gases all of the above 17. Select the incorrect statement. Gases molecules constantly move in continuous, random motion. The volume of individual gas molecules in a container is negligible compared to the volume of the container. . Repulsions and attractions between gas molecules are significant. The average kinetic energy of a gas is proportional to the absolute temperature. 18. The kinetic molecular theory of gases predicts pressure to increase as the temperature of a gas increases because: I. the average kinetic energy of the gas molecules increases. II gas molecules collide more frequently with the container walls. III. there are more molecules per unit volume after raising the temperature. IV. the elasticity of the molecules increases. V. there are less molecules per unit volume after raising the temperature. a) I and II b) I and III c) II and III d) II and V

Please answer & explain 15-18

Answer 1

15 Double bond contains 10 and 1 T bond - (sigma) (pi) Triple bond contains 1 eigma and an bonds Single hond contains one sigma bond As first bond made is always sigma % (1 is right answer Gases have large spaces b/w Individual Constituents so they can be compressed easily. Catoms on molecules) Gares mix homogeneously eg. consider air which is a homogeneous mixture of various gases 80 (D) is the right answer According to Kinetic theory of Grases as distances b/w molecules are large & molecules have no forces of attraction or repulsion among them. Statement (w (b), (o are in accordance with kinetic theory of gases. Only (6) is incorrect. C is right answer 18 As temp. increases , average Kinetic energy also increases as - K.F. = 3 KT where I il temperceture - and gas molecules collide more frequently with container walls. Due to which pressure increases 2 ا دة هنرى الاطه hd و